A599 === Subject: A keyboard challange(kinda wierd) This seem to be random, like it was caused by cosmic rays or something. I expressed '(1/3)*3' and the 48 emitted .9999999999999. to read out to me, (all done and proud): 2: '(1/3)*3' 1: .9999999999999 O.K., fine... I turned it off after realizing just what I asked for, and got.. That was reasonable. But.. Later, I picked up the calc and ran my fingers over the keys several times, -um, to hear the clicks. I had run over the power key too, and when I looked down, the calculator was on , and the display read : '1/3*3+.999999999999' When this is put to < LeftShift View > , it reads: (1/3*3+.999999999999) ? ! What key sequence did that !? ***Look dudes!! It sucked two lines into one line!!*** and, if I can't do it twice, it's not Science. Please, could you extrapolate what my dumb-thumbs made ? that's infragiturbalatible, High-end Calculator wierd stuff, Huh? C'mon I need a clue here. Save me before I random key again.. === Subject: Re: A keyboard challange(kinda wierd) > 2: '(1/3)*3' > 1: .9999999999999 > I turned it off... > Later, I picked up the calc and ran my fingers over the keys > several times, -um, to hear the clicks. > > I had run over the power key too, and when I looked down, > the calculator was on , and the display read : > > '1/3*3+.999999999999' You pressed ON and then the + key. Unintentionally, I suppose, but that's what you did. -Joe- === Subject: Re: Where Can I get help with this formula I found in the back of... > > Do you mean the law of sines > http://en.wikipedia.org/wiki/Law_of_sines Interesting page - but it doesn't tell me which corner is which degrees I probably don't understand how to enter it into my cal... > > But then you need to be in degree mode, entered on my 50g (probably > also on 30g) by entering DEG === Subject: Re: Where Can I get help with this formula I found in the back of... >http://en.wikipedia.org/wiki/Law_of_sinesInteresting page - but it doesn't tell me which corner is which degrees > I probably don't understand how to enter it into my cal... It seems more like you don't understand trigonometry, which is a more important issue entirely. That page has the formulas you need, but if you don't recognize what is being solved it won't help you at all. You can enter them in your SOLVER applet just fine. TW === Subject: Re: Where Can I get help with this formula I found in the back of... ... > It seems more like you don't understand trigonometry, which is a more > important issue entirely. Exactly... That page has the formulas you need, but if > you don't recognize what is being solved it won't help you at all. You > can enter them in your SOLVER applet just fine. I've tried putting it in the solver- but how do you put in sin 1/2 A = ??? Is sin(.5*A) = the same thing??? Ok, the real surveyor set up his total statiion on point A knowing it was 75' o/s to the radious pt (C). Shot another 75' o/s (B). Put those 3 distances into his 48g and knew how far to swing his total station over to get pt (C). I believe I can do the same thing with my 39g if I could understand and enter the formula into it. So... there ya go... === Subject: Re: Where Can I get help with this formula I found in the back of... > Are you in radian mode or degree mode? > > The upper left corner of the screen will say either RAD, DEG or GRD. > > To get results in degrees, enter the RAD command before using the > program and see if that doesn't give results more like what you expected. Ok it says Rad... but that didn't help... === Subject: Re: Where Can I get help with this formula I found in the back of... > Are you in radian mode or degree mode? > > The upper left corner of the screen will say either RAD, DEG or GRD. > > To get results in degrees, enter the RAD command before using the > program and see if that doesn't give results more like what you expected. Ok it says Rad... but that didn't help... === Subject: Another bug - and nobody to fix it :-( Today I tried some complex number representations on a 50G (not mine) 5*(COS(53)+SIN(53)*i) wnet fine but the exponent version first asked about Complex Number mode and also about Approximate mode and when I tied TSIMP it kept on asking Approximate on each TSIMP although it already was in that mode - strange... Sorry I couldn't get the calc with me and I can't remember the exact formula - - - OK - I just tested it with 5*e^(53.*i) or rather 5*EXP(53.*i) Note the dot after 53 => real number, not integer The answer is 5.*e^0*e^(0.,53.) which asked Approximate all over again on each TSIMP one applies -- Veli-Pekka === Subject: Re: Is anyone currently trying to enable cas on the 39g+ > Im personally just doing this for fun, school holidays are on and ive > got a 39g+ (2 actually, one doesnt work), and ive decided to have a > play around with the rom seeing as the debugging tools are readily > available. > What i want to know firstly is has the method of checking the infra red > port to determine if the rom is running on a 39+ or 40+, like it did on > the 39g/40g, been changed. Else wise this would be just too easy. I > suspect it has, seeing as hp had to replace ever single 39g used by > year 10 students across australia. > > Also, a more important question, has anyone already enabled cas, if so > please email me and save me the effort. > > Finally, to all those who i know are going to disapprove of this, can i > point out i already have a hp 39g+ which runs cas (well sorta neway). > After my first 39g stopped working, i bought a hp 40g+ off ebay with a > broken screen, swapped the internals, hooked up the 39g screen, and > villa. I cant claim originality though, i know friends who have > switched the internals of the ti-84+ for the ti-89 titanium. > > As i said this is just for fun, i just want to know if removing the > IDrA still works, and if anyone else is currently working on this. The ROM is now different, thus there is no CAS in ROM - sorry! You have to put some CASh on table in order to order the 40gs with CAS === Subject: Disregard Newreader issues... just testing.... -- Grumpy Aero Guy === Subject: Disable CAS? Is it possible to disable/remove CAS from 49G+? It is a strange question, i know, but i need the speed of the 49G+ and don't need at all CAS..... Marco Polo === Subject: Re: Disable CAS? > Is it possible to disable/remove CAS from 49G+? Possible, yes. Practical, no. There would be so much of the system to rewrite you'd essentially be recreating a new ROM. TW === Subject: Re: Disable CAS? > Is it possible to disable/remove CAS from 49G+? > > Possible, yes. Practical, no. There would be so much of the system to > rewrite you'd essentially be recreating a new ROM. by not using CAS entires (commands) it's the same as if it was not there Some hints : -Use aprox mode and real numbers rather than zints and symbolics -generaly avoid symbolics as much as possible, -check flags 1 and 2 to use principal values rather than symbolics for results, and constants like PI manjo === Subject: packed bcd Have any of you tried doing pc programming using packed bcd? I am trying to rewrite a program for some guys in the office which involves a lot of degrees.minuteseconds conversions. If you store a dms value as a double (C language) and try to decopile it to text or maybe even to radians, sometimes it won't come out correctly because of the way it is represented. The hp 48 series avoids this problem with bcd. I currently am trying to work around it using a structure representing a dms value and I think it will work, but I just had the off-tangent thought that someone must have done something like this with bcd. If so I am wondering if there is some sample code floating around out there. === Subject: Re: packed bcd > > Have any of you tried doing pc programming using packed bcd? I am > trying to rewrite a program for some guys in the office which involves > a lot of degrees.minuteseconds conversions. If you store a dms value > as a double (C language) and try to decopile it to text or maybe even > to radians, sometimes it won't come out correctly because of the way it > is represented. The hp 48 series avoids this problem with bcd. I > currently am trying to work around it using a structure representing a > dms value and I think it will work, but I just had the off-tangent > thought that someone must have done something like this with bcd. If > so I am wondering if there is some sample code floating around out > there. > > suggest you take a look at http://www2.hursley.ibm.com/decimal/ the densely packed decimals http://www2.hursley.ibm.com/decimal/decbits.pdf http://www2.hursley.ibm.com/decimal/decnumber.pdf and also suggest http://www2.hursley.ibm.com/decimal/arith15-foils.pdf they pack 7 decimal digits in a single and 15 decimal digits in a double and range of the decimal floating point number (exponent) is similar to single and double. Gjermund Skailand === Subject: Re: packed bcd > Gjermund Skailand Those links were very imformative. === Subject: Re: Double integral! - Very hard (or not?) >>John H Meyers > > I'm entering the equation by using the integral sign and by using the > EQW function. > > My flagsettings are the same as you've mentioned you had. > > For the question why I need to solve a equation easy like that is that > I only took that up as an example to prove that I couldn't even solve > easy ones. The ones I need to solve for the course is a bit more > complexed ;) It took me about 10 seconds on the TI89 to type in the problem and get first an error, another 10 seconds to clear my x variable) then the result: 2-e -- Good day! ________________________________________ Christopher R. Carlen Principal Laser&Electronics Technologist Sandia National Laboratories CA USA crcarleRemoveThis@BOGUSsandia.gov NOTE, delete texts: RemoveThis and BOGUS from email address to reply. === Subject: Re: Double integral! - Very hard (or not?) > It took me about 10 seconds on the TI89 to type in the problem > and get first an error, another 10 seconds to clear my x variable)... Do you mean that the TI89 also requires that you first delete any existing variable which appears in the problem? This could explain why this same requirement popped up in the HP49G[+]/50G/48Gii series, whereas it was never required for algebraic stuff in the HP48S[X]/48G[X][+] series, and one would think *could* have been entirely avoided in the new HP series (but why bother if TI is just as bothersome?) It would be an interesting historical perspective if so (I've never used a symbolic TI calc, so I wouldn't know). [r->] [OFF] === Subject: Re: Double integral! - Very hard (or not?) > It took me about 10 seconds on the TI89 to type in the problem and > get first an error, another 10 seconds to clear my x variable) then > the result: > > 2-e That shows quite something, ehh? Your result is wrong, the correct answer is 'e-2'. Should have used 10 seconds more on this... Steen === Subject: Re: Installing latest 49g+/50g (emulator) ROM on a 49G > >> > my real [49G] calculator displays blank after Terminal Mode >> >> As http://www.hpcalc.org/hp49/pc/rom/ says: >> Press [4] to select terminal mode. A blank screen appears. >> >> This may be where the 49G awaits receipt of >> an initial four special bytes on the serial port, >> which signifies a proper source from which to accept ROM; >> the FDP program (or ROMUPLOAD command) sends these >> when told to start the transmission. > > OK Now it suddenly worked! John the Great!