8449
===
Subject: Re: HP50G user review
> gone is the 'Key
> Click' that I always had turned ON on the
> 49G+ just so I could be sure that the key
> had registered.
 It's still there...   MODE/Key Click ON/OFF
I'm sure he just meant that he no longer needs it, not that it is
actually gone from the options.
===
Subject: Re: HP50G user review
 gone is the 'Key
> Click' that I always had turned ON on the
> 49G+ just so I could be sure that the key
> had registered.
 It's still there...   MODE/Key Click ON/OFF
 I'm sure he just meant that he no longer needs it, not that it is
> actually gone from the options.
  Exactly - Thanx. To others, I'm also very aware that the 50G
is just a 49G+ in a jazzed up new package. I own the 49G+
also and I'll say again the 'upgrade' was well worth it. The
cosmetic changes, four batteries, more solid build made it
an entirely new machine, for me anyways. If any of you
have owned and used the 49G+ for a year or two, then you
know what I mean. Freed from the 49G+ keyboard at last -
I got headaches flicking my eyes back and forth all the time
from the screen to the keys just to be sure they registered;
and treating the keys like they were made of glass for fear
they'd break and fall out. Free of the whole flimsy mess. After
reading your responses, I'd still do the same thing over again;
I'd buy the 50G in a heartbeat if it was a choice between the
49G+ and the 50G.
  Anyone out there who bought the 50G and owned the 49G+
previously and used it for at least a year? After making the
comparison, would you buy the 50G again if given the choice
or would you just keep the 49G+ and save your money ???
 
Eric Rechlin posted a history of the various production versions
of the 49G+; the original (in both hardware and ROM) was more like
what you describe, the second generation was improved,
and the third generation was every bit as good as a 50G,
except that it still carried the stigma of the original
product name, and looked just like the same original lousy units,
so now there is, in effect, a fourth generation of the 49G+,
with a new name, new color, etc., plus actual small extras like
the serial port (for which no standard commercial cable exists :)
and running on pure USB power when plugged in -- but those have
nothing to do with the contrast that you are noting,
which had already been completely resolved
by the third generation of 49G+,
with which you would no doubt have been every bit as happy.
Your review is a very good summary of what has improved;
the improvements mostly took place just a bit earlier,
though, and were not mainly between the last 49G+ vs. 50G,
but rather somewhere along the time line
between the first and third generations of the 49G+
People still considering whether to buy 49G+,
whether used or left-over unsold inventory,
should therefore know that it's possible to get a good deal,
and to find a perfect 49G+ that's the equivalent of a 50G,
but unfortunately it takes a careful inspection
to discern which 49G+ are the good ones,
which the re-branding as 50G has solved,
at the same time possibly commanding a premium price.
Eric's excellent report
 
  VERY good point - so I should emphasize that my comparison
was between a '1'st generation' 49G+ and a 50G. No point
in tossing a perfectly functional 49G+ for an equivalent 50G.
My serial was early CN334. I didn't realize that the last
that out to me . . . if I'd waited a while to buy the 49G+ so that
I'd have the later generation, I could've saved myself a nice
little pile of coin!
 
Why?... I have Sharps (among them EL-5000 and first Sharp pocket
computer, PC-1211..), I have some ancient Casio's, some ancient TI...
Some HPs too...
This what I am saying is that manufacturing and selling calculator
with 1600 pages to print yourself is idiocy.
I agree completely.  If including full printed information is too
expensive then the printed advanced manuals should be available to
order.  The cost of printing out 1500 or so pages on a laser or inkjet
printer is as much or more than the cost of the calculator.
Rich Wood
 
I thought he likes Sharp. I like Sharp.. El-506 
-It keeps a train of your last operations, that can be quite handy.
I didn't like the keys too much, until I reassembled it twice and the 
keys felt firmer.
They are nothing close to the 35s's though; the thing is practicaly my 
new buddy until I need the old 48s.
How are the bottom-ings of the HP50 key-strokes ? Softer or hard-down? 
My 48S hits bottom solidly, and the 35S has a springy feel, 
so I don't punch on it overmuch.
 
I like Sharp EL-5100. Best calculator ever designed, however  with
programmable calculators, my favourite is Sharp PC-1211.
EL-506 is pretty much continuation of EL-5100, but ergonomically much
worse.
A.L.
===
Subject: Re: HP50G user review
I am not alone :)
http://www.cnn.com/2007/TECH/ptech/07/01/la.countertrends/index.html
===
Subject: Re: HP50G user review
The 50G is not so much a new model
as a cosmetic external makeover of the 49G+
(the last production runs of which had already
contained the redesigned keyboard mechanics,
which is the most significant part of the upgrade),
with a little bit of ROM updating for the
serial port, and the updated power supply.
Early 49G+ production had so damaged HP's reputation
in this product line that there was probably
no other way to stay in business with the same product line
than to change its appearance, call it a new model,
and apparently achieve success in giving people
the impression that it really is,
so much so that users even keep asking
whether programs for 49G+ are compatible with new 50G.
Someone showed me a 50G in the same 49G+ external package
(gold keyboard face, etc.), but having the serial port
and four batteries; this ought to prove the point
that it is an incremental hardware upgrade
(a third generation 49G+ with added serial port
and power supply upgrade); these modifications also
cost money, as does the updating of advertising,
web sites, materials (manuals), and distribution,
but surely nothing like the expense for an actual new model,
and essentially a required investment, to go on selling these at all.
Apparently everything nowadays gets regularly repackaged,
just to keep sales from stagnating, even for everyday products
which really never change --  As recently as the 1990s,
most package designs were retained for seven or more years.
Now marketing executives say they are constantly planning package 
overhauls.
The average life of a package before its next makeover is down to two 
years,
they add...
Laurent Nielly, who heads packaging innovation for Pepsi in North America,
said young people - Pepsi's central audience - have shorter attention spans
than previous generations, so bottles and other containers have to change 
more often.
Pepsi is experimenting with the designs on its Mountain Dew bottles,
selling aluminum bottles covered in graffiti-like designs
that will be changed 12 times from May to October.
http://www.nytimes.com/2007/08/10/business/10package.html?ex=1344398400&en=2

79c2a4e8f9620bb&ei=5088&partner=rssnyt&emc=rss
Since calculators with a High School market are also aimed at those
same people whose attention span is shorter than any previous generation,
it's no wonder that incremental products pop up so frequently,
often with something like a chevron keyboard being the major change.
With so short an attention span in the next generation of its stewards,
how will any of the accumulated wisdom of all past human civilization
have any chance to survive?
===
Subject: Re: HP50G user review
> Since calculators with a High School market are also aimed at those same
> people whose attention span is shorter than any previous generation, it's
> no wonder that incremental products pop up so frequently, often with
> something like a chevron keyboard being the major change.
I think every generation does not give the next the respect it deserves;
and as proof I offer the following quotation:
ñaffluent parents have become role models for luxury and 
licentiousness,
and have moved far away from caring about whether their children develop
habits of discipline and self-restraint. As a result, young people are
increasingly impudent and have a total disregard of the respect they owe
to themselves and others.î
-Tacitus, A.D. 75
As far as Pepsi goes, their market share and total sales volume is
decreasing. Why should we think one of their marketing people has any
competance?
===
Subject: Re: HP50G user review
Very true, but as standards go lower every generation very soon now we
will hit bottom (again) then we can rebuild.
===
Subject: HP-41 function prompts
Hi all,
there is a certain behaviour of the HP-41 that always made me wonder. 
Example:
Press STO and you get a STO __ with two underscores prompting for a
two digit register number. Press shift Fix and you get FIX _ asking
for the number of displayed digits.
This prompting *only* occurs with functions in the 41 itself, i.e. with
functions listed in catalog 1. It is not used for external functions
like those in peripherals or ROM modules. Consider the card reader's
compatibility functions for the 67/97 DSP command. The is no single
7DSP command, prompting for an argument like the regular FIX. In fact,
there are *ten different* commands 7DSP0, 7DSP1, 7DSP2, ... 7DSP9, one
for each and every possible number of digits. The same holds for various
other catalog 2 functions that could be expected to prompt for a value:
file names, parameters and other arguments have to be stored on the
stack and in Alpha before the function is executed (e.g. MYFUNC SOLVE
instead of SOLVE MYFUNC or even SOLVE IND 09).
Question: is there a technical reason why prompting is not used or not
possible with other functions than those in the 41 itself?
Yes and no.
Yes, you can write your own external functions with prompts,
but no, you won't see the parameters in a program.
XROM names in programs are always restricted to their name,
or more exactly their XROM number, which lets the HP-41
retrieve the associated name.
There is no way for the HP-41 to recognize the parameter data
following the function name as parameters in a program.
So if you remove your external ROM, but still have the program
containing the XROM call in memory, you'll see XROM xx,yy .
How should the HP-41 know whether the words following
the XROM call were parameters?
This is the reason (slightly simplified) why most external functions
expect their parameters on the stack or in Alpha.
Is there also an explanation why external functions can be executed
indirectly? E.g. EMDIR  ASTO X  XEQ IND X  shows the EM directory.
Dieter
===
Subject: Re: Any good programs for Algebra, Geometry, Trig, and Precal?
Installed libraries (including HP's Eq Lib) are already in some port;
most people store them into the flash port, which is the largest,
is preserved without battery power, and is hard to trash
(though not absolutely impossible to wipe out).
In addition, libraries are non-modifiable anyway,
which means that at worst, you'd only need to store the original again,
so your original copy (or a copy from the internet) is your backup.
Built-in functions (and their CATalog) are in ROM,
which is also a part of flash that's out of reach of errant programs,
and does not need backup (though you can download various
archived and/or beta rom versions that you can even re-flash).
What remains is whatever *you* have put in yourself,
or perhaps some downloaded programs that are stored into variables,
rather than into a port;
if you have never invested in putting anything in yourself,
such as your own programs, formulas, notes, or whatever,
then I guess you have nothing to back up!
Some people have gathered quite a lot of data and/or programs,
however, in which case they are concerned to have a quickly
restorable backup, rather than have to start again
 from a factory fresh (and empty) calculator, which is
sort of like returning to a formerly fully furnished house,
and finding only the original bare walls :(
> So... if I store it in FLASH directory then even if I receive a virus
> or erase all of my memory I will still be able to access my FLASH
> directory and retrieve everything I've stored in there?
Yes; it's just a semantic thing that the flash area
is usually called a port, and is more like a storage locker,
containing non-editable things, whereas directory
usually means an easily edited variable in user memory,
with all the collected user variables
(plus any stored alarms and user keyboard assignments)
residing in what is called the HOME directory.
Good luck with your new home.
===
Subject: Re: Any good programs for Algebra, Geometry, Trig, and Precal?
Okay, I was able to successfully store my HOME directory into the
FLASH port. I'm just curious but what does the BK001 stand for? I know
that the :2: is the port and where you want to store the other file
but BK001 must symbolize the HOME directory?
So if I've stored my HOME directory in the port should I be safe to
download any of the files on hpcalc.org (that has a hp 49 symbol) onto
my calculator without any fear of data loss? I should be able to
retrieve all of my items after right? Also, I've read in the User's
Guide that you are able to write a code into the RPL (or something)
part of your calculator. There was a code to find the mean of a data
set and whatnot. Should I try to insert those into my calculator?
===
Subject: Re: Any good programs for Algebra, Geometry, Trig, and Precal?
> Okay, I was able to successfully store my HOME directory into the
> FLASH port. I'm just curious but what does the BK001 stand for?
Nothing; just an arbitrary name, attempting to convey an association
(backup) and a possibility of sequential numbering (there being
no modification date or time stored in calculator files),
which might result in some useful semblance of organization.
Longer names may be used, but can't be seen in narrow menu labels
(although you can view them with the review key or in the Filer).
Nowadays it's recommended to be specific in examples,
rather than say press any key -- in response to the latter,
someone is sure to press only the Shift key :)
It looks as if you're well backed up now,
so have fun experimenting, and best wishes.
===
Subject: Re: Any good programs for Algebra, Geometry, Trig, and Precal?
By the way, thank you a lot for your help John! You must be very
knowledgeable about HP calculators because I've seen one of your
programs on hpcalc.org. How long did it take you to achieve your
current state of knowledge about calculators? I've had this calculator
for a few months but I still don't know many of the basics =P
===
Subject: Multivariable Limits in HP-50g
Hi friends... it`s posible to do limits respect to two variables with
50g??? if it`s posible could anybody tell me the way...?
===
Subject: Re: Multivariable Limits in HP-50g
> Hi friends... it`s posible to do limits respect to two variables with
> 50g??? if it`s posible could anybody tell me the way...?
Just by accident I was reading a user help file and I read this!
?     How do I take a limit for two varaibles?
Look at this thread for the answer.
===
Subject: Time for a modern HP 41C/CV/CX!
With the HP 35s, HP is returning to its calculator roots: a powerful
RPN machine with a classic keyboard layout: a modern version of the HP
35.
I suggest that a modern version of the HP 41 series be next. The user
community enthusiasm and support for the 41 was the greatest for any
calculator in history, before or after. Let's bring that back!
It could be called the 41S (or the 45S, or the 65S.) It should also
have RPN and a traditional key layout. It needs a modern function set,
alphanumeric labeling and prompting (as the 41 had), modern I/O (such
as SD card slot and IR), and a large memory. I suggest a 4-6 line
display.
Any thoughts?
===
Subject: Re: Time for a modern HP 41C/CV/CX!
> It could be called the 41S (or the 45S, or the 65S.) It should also
> have RPN and a traditional key layout. It needs a modern function set,
> alphanumeric labeling and prompting (as the 41 had), modern I/O (such
> as SD card slot and IR), and a large memory. I suggest a 4-6 line
> display.
> Any thoughts?
Yeah... there's not enough distinction here from an HP 50g to go and design 

new hardware; you could do everything suggested with an HP50g and just a 
re-write of the software.
===
Subject: Re: Time for a modern HP 41C/CV/CX!
I agree that the large display is too much.  I was always happy with
the 2 line display of the 42S and really like it's conpact design.
Afraid also that a SD card slot, or the ability for a USB port to
handle a thumb drive, will raise the power requirements to the point
of requiring much larger batteries.
Personally I want the 41CX or 42S capabilities in a reasonably compact
calculator with larger memory, some means of external program storage
via USB or a card slot using industry standard flash memory of some
form.  Ability to drive a printer directly via USB would also be nice
for hard copy of programs and results.
The one disadvantage I see of using the current HP35S chassis for the
new unit is that it appears to be unnecessarily large.  Based on the
listed dimensions it is actually larger than my original HP35, except
for thickness.  I should be receiving a 35S today or tomorrow and will
then be able to do a side by side comparison.  With it's use of
compact lithium coin cells, considering modern electronics, there has
to be a lot of empty space in the casing.
I would also love to see either the original 15C reintroduced or a
version with the same number crunching capabilities and updated
electronics to increase the speed some.  The 12C proves how popular
that compact design was and a 15C would again have a truly compact HP
scientific calculator available.
Rich W
===
Subject: Re: Time for a modern HP 41C/CV/CX!
IMO the HP 41 series, and 42S, were the most capable classic RPN
calculators made.  For RPN programmers also the most user friendly.  I
still have 3 functional 42S units and am getting ready to send in my
41CX for repair of a damaged battery power strip.  They were also more
than enough for 98% of calculator users I suspect.
Compared to the 48 SX/GX series, as well as the 49G and 50G etc, the
41 had really great I/O and peripheral expansion capability.  I doubt
though that HP is again ready to support a true expandable system
calculator such as the 41 series was.  Also a new calculator such as
you are talking about would require major engineering development
time, money and decisions. How high a stack etc.  RPN was never
implemented on a unlimited height dynamic stack unit such as the RPL
units have.
I personally suspect that one major attraction of the 41 series was
the relative simplicity of the operating system compared to RPL
units.  With the sophistication of RPL comes the additional study
required to use it's capabilities.  The 41 series was a natural
developnent of the earlier programmable HP RPN calculators, making it
easier for those used to earlier units.  The change to RPL with the
28C/S series was much more of a drastic change for the user/
programmer.  With the increased capability for programming went
increased complexity.
As far as sheer number crunching ability the newer graphing
calculators have much greater built in capability as well as more
sophisticated string handling etc.  Developing anything close to
similar capabilities within the limits of RPN would be difficult.  RPL
is a structured language whilr RPN depends on the programmer to be
diciplined enough to not produce spaghetti code.
Rich Wood
===
Subject: Re: Time for a modern HP 41C/CV/CX!
Also, much of the appeal of the 41 series was that the computers of
the day were much more expensive and less friendly. You could do much
on the 41 that otherwise would need a computer.
With computers today costing less than a 41 and peripherals (allowing
for inflation), it seems unlikely to me that HP could make money on a
new, comparable system.
My suggestion: an updated 42s based on the 35s.
===
Subject: Re: Time for a modern HP 41C/CV/CX!
Me too.  Basically increase the memory, add the CX time functions and
include a USB interface.
Rich W
===
Subject: Re: Time for a modern HP 41C/CV/CX!
I'd rather have some small flash card reader instead of USB port.
Reth
===
Subject: Re: Time for a modern HP 41C/CV/CX!
> I'd rather have some small flash card reader instead of USB port.
You could just attach a small flash card reader to the USB port. :-)
===
Subject: Re: Time for a modern HP 41C/CV/CX!
The feature I would most like added is matrix operations.
Right now, the 35s is difficult to use for values stored in the
indirect locations.
For example, to compute the determinent if a 2x2 matrix stored in A,
B, C, and D, you do
RCL A RCL*D RCL B RCL*C -
If the values are stored in (1) to (4), you have to do
1 STO I RCL (I) 4 STO I RCL* (I) 2 STO I RCL (I) 3 STO I RCL* (I) -
If matrices are added, it probably would be better to have named
matrices allocated from memory.
The trouble is, once you decide to add matrices, where do you stop?
1. Defining
2. Solving - separate left and right sides or augmented form.
3. Complex as well as real.
4. Matrix-vector operations.
5. BLAS
6. QR decomposition.
n+1. ....
Also, one addition that would make the 35s more powerful is to allow
indirect addressing through ANY register. This would augment RCL and
STO (which now can do +, -, *, and /) with indirect, whic I will
represent with #. RCL# A and STO# A would take the contents of A and
use it as an indirect address.
This would also free up one key (2 for (I) and (J), less one for #)
for a PARTS menu (ABS, ARG, REAL, IMAG, CONJ) and maybe a VECTOR
menu (get vector components via V1, V2, V3 and build vector for 1, 2,
or 3 stack elements).
Vectors also need a cross product.
===
Subject: 50G 1.5v AAA Lithium Batteries OK?
Looking at Energizer's data sheet on the 1.5V Lithium AAA cells it
apears that they are much closer to depleted than alkaline cells when
they reach the triggering voltage for the low battery indicator on the
50G.  In fact it appears that on a 48GX or similar unit with it's
lower low battery triggering voltage it would not trigger until
power loss was fairly imminent.
Have any members compared AAA Lithiums in the 50G with standard
alkaline AAA batteries and noticed additional life from the Lithiums?
If so how much.
I saw that this had been discussed before but no clear statement was
made of any differences in life expectancy and how thoroughly the
Lithium cells were discharged at replacement.  I have seen it noted
that Alkalines are only about 50% discharged according to some posts
when they trigger the low battery warning on the 50G.
Not for calculator, but tried for MP3 players, photo cameras and other
stuff. Lithium behave much better than alkaline in 2 situations: high
discharge current (photo camera with flash) and low discharge current
in low temperatures (outdoor temperature sensors).
I was dissapointed with Lithium performance in MP3 players. Lifetime
was actually shorter than standard alkaline.
A.L.
===
Subject: Re: 50G 1.5v AAA Lithium Batteries OK?
  
Looking at the discharge curve for the 1.5V lithiums I figured that it
looks like they are about 95% discharged when the 50G battery low
warning comes on per some posts.  I have seen where reportedly
standard alkalines are only about half discharged when the 50G battery
warning is triggered, at least on early units as reported here.
I wondered if anyone had actuallychecked this in a 50G unit.
===
Subject: Re: HP 50G External Power
USB:http://www.originalpower.com/index.php?option=com_content&task=view&i...

USB-onlyhttp://www.griffintechnology.com/products/powerduouniversal/
 Curious AC plug-matcher (no electronics, just plug/outlet for 
travel)http://www.the-gadgeteer.com/review/usbgeek_universal_ac_travel_adapt
er
that?http://www.amazon.com/dp/B000HS1YAUhttp://www.amazon.com/dp/images/B000
H
RVS98[click all views]
The only thing I want to add here is that to power the calculator you
don't really need a battery charger, those are designed for much
higher currents than what the calc needs to run. I personally bought a
4-Port USB hub with external power, it's much cheaper than a charger
(only 10 dollars in the US), and you can power up to 4 calculators at
once! (don't know what for... but it can be done).
Claudio
===
Subject: Re: HP 50G External Power
A hub works well indeed, and in some cases,
USB hubs sold as self/bus powered
actually have an input jack for a standard 5v external power supply,
as if they were engineered to come with one of those,
and then sold without one (sometimes instead with a Y cord
which allows two computer USB outlets to pour in more total current),
both to reduce price and to avoid being far less attractive
(expecially for laptops and other portables)
when packaged as if dependent on an AC outlet.
===
Subject: An Early RPN Calculator
Going through a box of junk the other day I ran across a quite early
RPN scientific calculator, the Commodore RPN4921 with LED display.
Mine is S/N 24492.
I stuck a new 9v battery in and it fires right up.  It brought back
some interesting memories.  A bit of experimentation shows some
fundamental differences between the Commodore and HP implementations
of RPN operation I had forgotten about.
The Commodore does not have the number in the T register duplicate
itself on stack drop so with the stack full of ones trying to use the
+ key as a counter stops after the total reaches 4.  Also no Last x
function.   These two differences mean that many of the old keystroke
algorithms developed for HP's calculators need to be modified for the
Commodore.  Also there is no display control available.
Other than that it appears to have pretty much the same functionality
as the HP 45 with possibly a few additional functions implemented.
The keyboard has 49 keys with the Enter key the same size as the
others and it sits in the lower right corner of the keyboard.  Very
slight tactile feel from the keys but better than older Casio and
Sharp keyboards I have felt.
Overall it just does not have any feel or appearance of Quality
compared to the HP classics IMO but it is an interesting thing to play
with.  Doing the Sin and inverse for 45 degrees for instance takes
over two seconds of processing time.  The inverse takes the longer
time, about 1.5 seconds.
I am willing to bet that it's original cost was substantial, possibly
well over $200 when introduced.  After all the HP 35 was originally
I had a National Semiconductor 'NOVUS' 4640 I purchased in 1976 for
$67.43 as I remember. Most calculators were slow at trig/log
functions, but it was an inexpensive alternative to a 'real' HP.
In addition to the Commodore I have a Natl Semiconductor calculator
intended for unit conversions.  Sold in the USA but it is the only
calculator I have ever seen with a Stones <> Pounds conversion built
in.  The operating system does not seem to be algebraic or RPN but
more a relative of the simple 4 function calculator with some
extensions.  Also little consistency between conversions and the other
functions.  More of a happening than a design.
Other interesting conversions were Atmospheres <> PSI, Knots <> MPH,
Cubic Feet <> Gallons and Imperial Gallons <> Gallons as well as some
of the standard metric conversions.
No model number, just National Semiconductor International Computer
on the front with no rear label.  As I recall it was given to me by a
NS employee so may have been a lunchbox special based on the lack of
model # / serial # label.
All this is different on the SR54 NC. The stack has the usual four
levels, LastX is available, T copies down at stack drop, and there is a
DSP key. The display shows 12 (!) digits in red LEDs. Default is Fix 2,
just as in classic HPs of that time.
However, speed and accuracy are two weak points: Evaluating a sine or
power can take more than 3 seconds. During computation the display looks
like a classic LED-HP while running a program. <8) Although up to twelve
digits are displayed the last one in transcendend functions may be off,
here and there it's even worse: 98 INV LOG => 9.99999999582 E+97.
> Other than that it appears to have pretty much the same functionality
> as the HP 45 with possibly a few additional functions implemented.
The SR54 NC offers the usual set of scientific functions, including
hyperbolic trig, polar <-> rectangular conversions, statistic summation
for a single variable with mean and standard deviation, x! and finally
some metric <-> imperial conversions. There are 10 data registers,
R7...R9 are used for statistics.
Hmmm... I wonder if I got the original receipt somewhere...
Dieter
===
Subject: Re: An Early RPN Calculator
On Sat, 11 Aug 2007 22:17:31 -0700, richwood <astronut1001@yahoo.comGoing through a box of junk the other day I ran across a quite early
>RPN scientific calculator, the Commodore RPN4921 with LED display.
>Mine is S/N 24492.
In Europe there was Novus calculator with RPN, around, as I recall,
1975. Novus was brand of National Semiconductor
As I recall, it was this one
http://www.vintagecalculators.com/NatSemiMathematician_11.jpg
Cannot check, because the original is 5000 miles away :)
A.L.
===
Subject: Re: An Early RPN Calculator
yep... i had a novus... red leds if memory serves...     :-)
 
I had a Novus Scientist programmable in the US in College in the late
70s. talk about slow trig functions, one could read war And Peace doing
trig functions...and it was not very accurate either, one of the least
accurate scientific cals ever made.
I have an APF Mark55. New in the box.  It is an RPN calc.  Not sure of its 
production date, but I guess from the serial number 1973.  I bought it new 
from a wholesale supply store that was closing in 1994.
 
who CLAIMS to still have 512K and 1 Meg cards available in stock.  The
company is Southern Photo Inc.  Prices listed are $242.95 for the 1
Meg card and $161.95 for the 512K card.  High prices but better than I
found on ebay and these claim to be new cards.
Here is the link to the 48GX accessory page.
http://www.southernphoto.com/view_item.asp?SKU_GP=7853
I hope that their web site is accurate and the listed items are still
in stock and available.
And here is another source for the 512K and 1 Meg TDS cards though the
price is a bit higher.
http://www.internationalcalculator.com/surveysoftware.html
Rich Wood
I'm located in Vienna (Austria) and have a couple of Klotz-electronis
1MB cards here.
If anyone is interested, i'll sell themfor 70? incl. shipping within
European Union.
just write me an email
        Sorry, my news client does not show your price
correctly... was that supposed to be 70 euros? If so, I might be
interested. 
They have indeed become difficult to obtain. Cynox in Germany 
(www.cynox.de) used to have them (their own make) until quite recently. 
They no longer appear in their web shop, but you might try to contact 
them directly. I think the prices were 40 Euro for a 128 kB card and 60 
Euro for a 1 MB card. There was an ebay-shop from Germany 
oklotzbestbuy who also had them, but I have not seen them for a while. 
An ebay seller jeffthenose sold quite a bunch recently, I don't know 
if he has any more, you might just try to contact him. Beware of some 
ebay resellers which sell these cards at ridiculous prices. Other than 
that, you just have to sit and look patiently on ebay, reasonable prices 
would be in the vicinity of 40 $/Euro for a 128 kB and 60 $/Euro for a 1 
MB card. Over time I managed to obtain these cards at reasonable prices; 
on ebay check also the offerings from European sellers, sometimes prices 
are still more moderate over here than in the United States.
Hope this helps you a bit further.
Chris
I was just looking on ebay and noticed a few for sale, mostly
aftermarket versions.  Prices are extremely steep, as in the $400
range for a 1 Meg card.  Unfortunately no longer available new and
apparently the demand is there.  Ridiculous when you think of the cost
cards that I bought originally.
Rich W
Are you in the USA? (I'd rather not mess with customs).
I have a 32K and a 128K genuine HP ram Card in excellent shape.
Make me an offer.
They would need new batteries, but in great shape because they were spares I 

just kept in a drawer.
===
Subject: logb program for the HP49???
There is a RPL program called logb that uses extended precision
numbers to calculate the log to any base. i have the RPL code for the
HP48, but what would be the code for the HP49. Here is the old HP49 RPL
code. (from the book The HP48 Handbook by James Donnelly
____________________________
<<
RTOE2                (convert reals to extended reals)
#2AB5Bh SYSEVAL   (take the log of the base)
SWAP
#2AB5Bh SYSEVAL   (take he log of the number)
SWAP
#2A9E8h SYSEVAL   (divide)
ERTOR     (convert result to real number)
===
Subject: Re: logb program for the HP49???
:: CK2NOLASTWD CK&DISPATCH1 SEVENTEEN
:: %>%% SWAP %>%% %%LN SWAP %%LN %%/ %%>% ; ;
Another way to create in HP49/50 series calculator:
D9D20C9262823621B133D9D20CAFF232230CAFF2
6450332230645033D303B9FF2B2130B2130 +
DUP BYTES DROP #CEAEh == #100001h * LIBEVAL
'LOGB' STO
Example:
8 2 LOGB -> 3.
So does that use the single quote of the key thats to the right of the
EVAL kep for the first 2 lines, or is it the quote key found by
right-shifting the multiplication key...???
===
Subject: Calculator Re-issues
There seems to be a lot of interest in re-issuing discontinued models
of HP calculators, so here's my 2 cents worth...
What about re-issuing the HP-15C? HP apparently decided some time ago
that there was no interest re manufacturing one of the finest
calculators ever produced by ANY manufacturer. Well, I don't where
they took their little survey, but all I can say is BULL HOCKEY. The
12C is still around, and I definitely feel that a nice, scientific
slimline would generate incredible interest.
Not a new idea: http://hp15c.org/
The manuals for the 15C were also some of the best manuals ever made.
Especially the optional 15C Advanced Functions Handbook....it goes
pretty deep into mathematics theory.
===
Subject: How do you store/organize text?
I own a HP 50g and I would like to create my own Equation library
for trig identities, ellipses, hyperbolas, etc.. Is there anyway I
could do this? How do you organize it so that you can group these
references/notes into sections to easily access them?
In addition to mathematics symbols, I would like to include text also.
This can easily be done right? Would I just press ALPHA two times and
then type away?
I also have another question. Will saving all of these notes take up a
lot of my memory space? How can I save them into the port (Flash) so
that they will not be erased? Also, will I be able to transfer and
save these onto my computer? Is there anyway to type, in LaTeX for
example, and then transfer the symbols, numbers, and wording onto my
calculator?
- HP 50g User
===
Subject: Re: How do you store/organize text?
r
all of this can be easily done with the TreeBrowserBuilder.
Take a look at http://www.software49g.gmxhome.de
I'm sorry but I cannot read in whatever language that site is in. Are
===
Subject: Re: How do you store/organize text?
the site is in English and in German.
If you click on 'english' below the british flag the navigation bar on
the left side will change to english and will lead you to the english
documents.
The site works with Netscape and IE.
How did you try to access the site?
Andreas
http://www.software49g.gmxhome.de
===
Subject: Re: How do you store/organize text?
now. Just a quick question, does the program allow you to store your
own equations?
===
Subject: Re: How do you store/organize text?
Also, it says that you need to pay to use this program. Are there any
===
Subject: Re: How do you store/organize text?
> Also, it says that you need to pay to use this program. Are there any
It is a very nice program.  If you are really serious about your
equations, I'd encourage you to get it.
There was another equation manager that was very popular on
while on my honeymoon. :-)
I have updated it tonight just for you!  I've added the ability to
create a NOTE along with your equations and folders.  Mine is called
PEQUM, which stands for Personal EQUation Manager and has almost the
same capability as any other our there, but is very tiny.  If you'd
like to give it a try, you can download the new version with notes
here:
http://pssllc.com/pub/pequm.zip
===
Subject: Re: How do you store/organize text?
Hello Tim,
> It is a very nice program.  If you are really serious about your
> equations, I'd encourage you to get it.
TB and TBB offer a completly new infrastructure for your equations.
is not converted to a lib so that new users of the calc can not mess
with the data set which is potentially dangerous if one doesn?t know
what he/she is doing.
Andreas
http://www.software49g.gmxhome.de
===
Subject: Re: How do you store/organize text?
Wow, that sounds awsome. Where can I download a good Hp 50g emulator?
Can I directly test the programs on emulators? The thing is I haven't
ever downloaded any programs before and I would to test programs out
and see how everything works.
===
Subject: Re: How do you store/organize text?
Try www.hpcalc.org
Then search for Debug4x, which includes a suitable emulator,
then download it, then read the docs;-)
HTH
Raymond
Hp 50g User <sat1.storage@gmail.com> schrieb im Newsbeitrag
===
Subject: Re: How do you store/organize text?
> now. Just a quick question, does the program allow you to store your
> own equations?
The main purpose of the TreeBrowserBuilder is to create your own sets
of equations. You can also store the variables for your equations,
text and pictures.
The TreeBrowser is used for showing the data sets created. One
possible way to create a data set is the TreeBrowserBuilder.
More information is availabe in the docs of the program.
The link on the entry page was broken (didn?t notice this earlier,
sorry) but should work now if you reload the page (probably you need
to delete your browser cache to ensure the you reload the page).
> Also, it says that you need to pay to use this program. Are there any
The zip-file TBdemo.zip contains a fully working version of both
programs (TB and TBB) and has no restrictions except that it will
kindly remind you to register the software. Data sets produced with it
will work with the registerd version, of course. It works on a real
calculator and in Emu48.
You can test it as long as you like and if you are convinced of the
ease of use and it?s features you just register it ;-)
There is no comparable program that offers the features that the
TreeBrowser will bring to your HP 49G/49G+/50G.
Sorry, but the development time for this program is over five years
now and you know There ain't no such thing as a free lunch.
Personally I do not think that 15 ? is an expensive price for a
student for this program compared to the feature it offers.
Also consider the price with the time and effort that you will need to
come up with a solution for your initial question as the 49G is not
capable of this out of the box.
http://www.software49g.gmxhome.de
===
Subject: Hello. I'm a new hp-50g Owner
Cc:  raut@math.fu-berlin.de,dominik@science.uva.nl
First of all, my background. Prior to this I really only owned a
TI-89. That is a good calculator, and I do like its CAS quite a bit.
I've found that it does a few things better than even MAPLE will. (But
of course, MAPLE does better on many other things)
The HP-50g's symbolic capabilities are not quite as nice as the
TI-89's, for a couple of reasons, one of note being that the 89 was
not trying to be backwards compatible, so as a result nearly
everything was happy to accept symbolic input. The HP-50g comes a bit
short on that. But in its defense, the HP-50g has an enormous number
of cool features that the TI-89 lacks.
I was familiar with RPN in theory, so it was not too hard to become
adjusted but it did take a while.
I have found that i have been installing all of my libraries in port
2. As far as libraries go, I have:
* extable (actually extable2)
* The equation libraies
* Nosy 4.1 by JNE Bos
* Emacs 2.11a CD&Pivo
* SDiag 2.11 CD
* OPEN FIRE v2.9
* PASSIANS (greyscale card game, using OPEN FIRE)
I also have Filer6 and LE42.BIN (LibEx 4.2) installed in port 2.
Emacs was installed using the default keybindings. LS APPS (normally
filer) was reassigned to Filer6 (I used Keyman+ to add TAKEOVER to the
assignment).
My STARTUP file sets -62,-117,-41,-61,-40, and clears -95 (it also
forces a garbage collection)
which I have the OpenFire Dune version, (and a simple userRPL program
to deal with the save data.), a 10 byte program that launches
MINEHUNT, and a small script to launch the card game.
Is there any way to create a script to automatically launch the
MINEISBETTER tetris game? I would assume that it could be launched
easily enough with the correct pointer, but no such pointer is
included in extable2, nor could i find such a pointer mentioned on
this list.
Does anybody have any comments? Library suggestions, etc?
I've thought about libman, but so far my libraries are not that out of
control.
I've looked at  unitman, which looked good, but i don't like the idea
that the whole customized menu gets assigned to the key. I would haver
preferred a design using a specially named variable and assigning a
small constant sized program to the relevant key. It could be a simple
pointer to one of the lib's $HIDDEN programs.
Dr. Wolfgang Rautenberg, why did you choose to assign the whole menu
to the key like that? (You mentioned it could be problematic and
suggesting using bz2 on it in the manual). Is this format merely a
holdover from the HP48 unitman program?
Carsten Dominik, What has happened to development of the emacs
package? I'll admit emacs itself may not need much work, but SDiag is
definately not finished. Looking at the table of contents, there are
entire chapters planned but no implemented.
===
Subject: Re: Hello. I'm a new hp-50g Owner
> Does anybody have any comments? Library suggestions, etc?
The fatcal calendar program available from www.hpcalc.org is a great
calendar program. Its simple, and to the point. A nice example of
something that is simple, yet elegant, and gets the job done. no
clutyter, just good meat to it. One of its features is to put the
number of the month on the stack, then put the year, and it briongs up
that calenddar. Simple, to the point, good programming.
Cannot be said better. TI-89 is good CALCULATOR, HP-50 is good GADGET.
===
Subject: Re: Hello. I'm a new hp-50g Owner
Yes, I too was bitterly disappointed by the HP-50g's CAS. I think I
should have stuck with the 89 a little longer...
Sorry, I don't know much about scripting/programming the 50g. You
might want to install a backup utility, a configuration saver, or a
CAS command help library (if you are unfamiliar with some commands).
I haven't used the 89, can you tell us what makes its CAS better?
===
Subject: Re: Hello. I'm a new hp-50g Owner
Well, I had been using the 89 for three years compared to 3 months of
the HP 50g. I find that the CAS on the 89 is *overall* better than the
50g. Let's see, here are some few points that I can remember off the
top of my head:
1.  The symbolic solver on the 89 is WAY better than the HP. The HP is
limited to rational expressions and elementary trancedental functions.
The TI can adquetly handle polynomial expressions, logarithms
(completely unlike HP), trigonometric functions (completely unlike
HP), e and pi functions, and a few others I cannot remember. The point
is, the 89 will try to solve everything you throw at it symbolically,
and if it can't, it will give you a numerical answer. I find that if
an equation has a symbolic answer, the 89 WILL be able to solve it and
will not give up like the HP if it doesn't simplify to a rational
expression.
2.  Symbolic integration (definite and indefinite) on 89 is better
than HP. I can't say much more about that. There were a couple of
integrals I had written down, and if I find them, I will post them.
3.  Simplification on the 89 is vastly better than that of the HP. I
know this is a point of contention because some people want internal
simplification whereas others do not. For example, entering sin(pi/2-
x) onto the 89 will return cos(x) whereas the HP will leave it
unchanged. Of course, you can go to the TRIG menu and rewrite it in
many different ways. I find that this is burdensome and the CAS has no
option to do this internally. Also, sometimes I expect a command to
change everything into sin() or cos(), but it doesn't so I have to
semi-randomly try functions to get an answer that I can write down on
paper.
4.  The 89's CAS trys to be consistent (note I didn't say it was
always) whereas the HP will constantly ask you to switch modes and not
switch to the previous ones after a calculation. I think everyone
knows this already and I'm sure there are programs for this, but I
don't want to take the time to download them ;) , I can do it manually
(but it's still a pain).
5.  I find that the TI is better at calculating limits using the
limit() command on the 89 and the lim() command on the HP. The series
command is so-so, sometimes it evaluates a limit, otherwise it
returns ? which I take means undefined or I can't do it.
6.  This is contentious: the 89 is better at summation and products. I
find that the HP sometimes returns summations as psi(a)-psi(b). This
is good that the HP is making use of it's built-in commands, but for
something like the sum of reciprocals, I sometimes want the fractional
answer. And arrow Q function doesn't help for large fractions. And
infinite summation is very weak on the HP. Also, I haven't been able
to find a product command like the 89's capital PI command. (I haven't
looked in the manual yet...)
7.  Factoring, generally, is better on the 89 because of speed.
Nothing much to say here, it's not a major issue because both will
probably handle whatever you throw at them.
8.  This might be simplification or maybe not, but it's your call: the
89 always tries to resolve everything in symbolics in Exact mode. The
HP, on the other hand, will ask for mode switches. For example, the 89
can evaluate sin(pi/5) whereas the HP can't (symbolically).
This is all that pops into mind right now... All of the above is in my
opinion so HP fans and TI fans, do not take offense. All I can say is
that the 89 has a superior CAS mainly because it is a mini version of
Derive.
===
Subject: Re: Hello. I'm a new hp-50g Owner
Symbolic polynomial root finder in TI-89 implements Buhberger's
algorithm that is using Groebner's Basis - quite powerfull tool.
===
Subject: Re: Hello. I'm a new hp-50g Owner
Heh!  But on the other hand, he's got an opinion, and he's taken some 
flack for it here (not surprisingly given the nature of the forum), and 
now, when he sees someone who says something close to part of his 
opinion, he sees that as support, and quotes it.  All very natural, and 
perfectly allowed, right?  He's not swearing or anything, and he DOES 
own a 50G, and likes some aspects of it.
I happen to agree with part of what he says he likes -- the 50G _is_ a 
great gadget.  Quality of the math aside:
1) It's way easier for a user to quickly program it once he knows RPL, 
the keyboard can be defined any way you like, up to and including 
hyper-cryptic 21-things-on-one-key kinds of things;
2) There are a lot of programs to help you customize the UI (thank you, 
thank you, Wolfgang Rautenberg!  And you too, John H. Meyers!  And 
Andreas M.9aller!  And any others I neglect here!).
3) It's very quick to get at the things you want once you know where 
they are, especially if you use the soft menus.
Also, I agree that the 89 is a great calculator.  I happen to think that 
the 50G is also, and I suspect that at least some of the people who 
prefer one to the other would have different opinions if they'd learned 
the other first...
> PS - ease of use doesn't equal best for everyone
Neither does ease of learning.  But that's what seems to sell.
Moreover, I don't consider word gadget negative. TI was designed to
do EXACTLY what it was designed for - to do calculations. On HP-50 you
can do MUCH more what does not necessary belong to calculations
arena. HP-50 is in priciple a computer, TI-89 is much less.
It can be discussed whether this is good or bad - the same as we can
discuss how good is cell phone with camera and whether it is more cell
phone than camera or opposite
I DO like programming in FORTH-like RPL, what doesn't mean that RPL is
good for everyone. However, it is much more FUN to program in RPL than
in TI Basic. But it is much FASTER to write a program on TI then on
HP, especially for someone who is not necessary computing enthusiast.
This is the reason of (absolutely positive) label gadget
===
Subject: Re: Hello. I'm a new hp-50g Owner
I'm not disagreeing with you, but I consider the TI more like a Windows 
computer -- quite capable of running apps that someone else has written, 
apps which take over the interface.  Icons and menus, etc.  HP is more 
like old command-line UNIX -- lots of small programs that you can hook 
together in user-written scripts, or just big command strings.
Hmm.  Once you wrap your head around the idioms of stack and list 
programming, I think RPL is probably quicker.  Longer learning time, 
especially for people used to function-style programming, maybe. 
Different way of doing things, yes.  But it's terse and pretty complete, 
so that once you've got a design in your head, the typing should be 
quicker.  I'm finding that to be true for me, and I've been programming, 
mostly in dialects of BASIC, for a living for twenty years, after 
learning on the original BASIC for the DecSystem-10.
APL is faster still, or so I understand it -- I'll probably never learn 
the real APL with the special keyboard -- and its proponents talk of 
doing amazing things with a small, well-chosen string of symbols.
 
===
Subject: TED and 30 Columns
I was just trying out the HP49/50 version of TED, which Gustavo (GaaK)
was kind enough to convert from the HP48 series.  It's just like the
old days, with fewer crashes.
However, it seems to have the same oddity it had on the 48 - it's
supposed to decompile strings to 30 columns, or to whatever value >9
you put in TED.WID.  I've never been able to make it reformat at all -
if you put in a 100-character string with no linebreaks, TED displays
a 100-character string with no linebreaks.
 Have I been doing something wrong?
===
Subject: A pair of Unusual HP42S Calculators.
According to the info on the HP Museum site the HP 42S ceased
production in 1995.  I have a pair made in Indonesia which according
to the serial numbers were made in 1999.
As I recall these were purchased from a calculator and accessory
specialist store in Corvallis just after Educalc in LA had
disappeared.  They were either a special run the store got HP to make
or were units intended for foreign sales long after distribution had
ceased in the US, not sure which.  They were sold with no manuals or
printed documentation for a price in the $60 or so range as I recall.
Any one remember what the store's name was?  Also any one else have a
42S with a serial number starting around ID940 (40th week of 1999,
Indonesia built)?
Based on the museum date apparently I have a couple of the last ones
made.
===
Subject: Re: A pair of Unusual HP42S Calculators.
I have a replacement 42S unit with s/n ID8310...
It was sent to me directly from the German HP distributor at that time, 
TomTech.
HP held a specific amount of replacement units on stock
for a certain period, about five years after discontinuation.
After that service period, they usually sold their remaining
stock through their distributors, at least in Europe.
This way I got some NEW Pioneer calcs (21S, 22S, 14B, 32S, 42S)
long time after they were abandonned by the manufacturer...
===
Subject: Re: A pair of Unusual HP42S Calculators.
Apparently, based on the dates on the units, they actually continued
production in some quantity rather than just stocking replacement
calculators.  I would think that the serial number stamping had to be
done prior to final assembly.  I wonder how the company managed to get
ahold of the support replacement units for retail sale, though being
in Corvallis it is quite possible they had an in with the HP
Corvallis division.
Rich W
===
Subject: Re: HP50G User's Guide vs User's Manual
Why bother? I've spent the last two or three days typing in example after  
example character-for-character to find that they don't work. E.G. Try  
page 21-63 the WHILE example. It doesn't work. I tried (as per the user  
manual) to add {12100 45} to the list {{120000 43}{120413 42}{120816 42}}  
and got {{120000 43}{120413 42}{120816 42}12100 45}. To get {{120000  
43}{120413 42}{120816 42}{12100 45}}, you have to Listname [enter] item1  
item2 2 ->list 1 ->list + It took me 30 minutes of experimentation to work  

that out. My last real calculator (there was a sharp in there  
somewhere), was an HP25. It performed exactly as documented. Don't get me  
wrong, I love my HP50g to little bits, but give me a room, the  
documentation guys (who quite evidently didn't talk to each other) and a  
bat. A minute or so later I will emerge with a blood-covered bat, none of  
which is my own.
I love the '50 but the manual (from a programming sense), is a complete  
waste of time.
===
Subject: How do install a binary that needs the ARM Toolbox???
There are some programs that need the ARM Toolbox at
http://gregory.thomas.free.fr/hpgcc.html
I have the ARM Toolbox, and have installed Libraie that use it, using
the Fix Sto command of the ARm Tookbox, but how does one install a
binary that needs the Toolbox but is not a libray?
I am interested in installing 2 progrms from the mentioned web site,
FPI and FEXP. I have the ARMToolbox installed, what does one do to
install the binary programs that use the Toolbox???
===
Subject: Re: How do install a binary that needs the ARM Toolbox???
> I have the ARM Toolbox, and have installed Libraie that use it, using
> the Fix Sto command of the ARm Tookbox, but how does one install a
> binary that needs the Toolbox but is not a libray?
It really doesn't need to be installed.  The only reason libraries
need to be installed is so that the HPGCC string inside them is
aligned properly because (insert technical stuff here).  I'd just
write a little program like this:
<< :3:PROG RCL PrRUN >>  ( that RCL may not be needed, I can't
remember )
Store that in HOME.  Then when you want to run it, the string will be
recalled from your SD card, and it will run.  This way you won't have
to keep the large program in your main memory.
You can also convert the HPGCC string into an 'executable' using the S-
>EXE command in the toolbox.  Then you can restore it to the SD card
and your launcher will consist of:
<< :3:PROG1 EVAL >>
===
Subject: Re: How do install a binary that needs the ARM Toolbox???
Still confused.
Can i just copy the program to my HOME dierectory and run it???...Or do
I still hav to use PrRUN even if I just copy it to the HOME
directory??
What exactly do I have to do if i copy it to the HOME directory???
===
Subject: Re: How do install a binary that needs the ARM Toolbox???
That Works fine for small programs, but not with bigger programs
becouse the memory isn`t enought... in that case you have to store the
prog as << STRING PrRUN >> and save it with the code as string in a
directory....
===
Subject: Re: How do install a binary that needs the ARM Toolbox???
Excuse me... of course in HOME....
===
Subject: Re: Just curious: Which HP calculator(s) are you using and how?
I use a 50; nothing more really, nothing less.  Mine is special
though.  It has long range bluetooth modules that can talk up to half
a mile away, an external power supply, can be run over by a truck, the
screen can be shot with a hollow point .22 cal rifle at 100 m,
submerged under 1 foot of water for 30 minutes, and it even floats.
Runs surveying equipment quite nicely.  Can handle streaming GPS data
5 times a second.  You can get one too for the low, low price of
1495$US. ;-)
http://pssllc.com
===
Subject: Re: Just curious: Which HP calculator(s) are you using and how?
   <rs9cb3ljk1s4a5gboqsg66a3vvrejh0jb9@4ax.com>
Still using a 12c daily
Had a 17B/19B  for about ten years then found a 12c for $4.00 from a
street vendor in San Francisco. Use it all of the time.
===
Subject: What happened to HP Pascal Project...?
It`s seems that HP Pascal project is freezed... do anyone knows if
it`s available in English or Spanish?. Do anyone have a Tutorial for
that compiler...?
===
Subject: Re: What happened to HP Pascal Project...?
Which 'HP Pascal Project' ?
Do you mean the HP Pascal compiler for the HP9000 Series 300 machines?
Raymond 
===
Subject: Re: What happened to HP Pascal Project...?
Maybe this one?...
http://www.hpcalc.org/details.php?id=6035
hp_pascal.zip 
Description: Program for 32-bit Windows which allows you to write
programs for the HP48 using Pascal. 
Author: Jouvencel Ludovic: http://djludo.online.fr/home/pages/home.htm
http://hppascal.fr.st/