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Preferred TI calculator??? - Namir - 01-28-2006 Ok, so we are HP-calculator nuts! I have two questions regarding TI calculators? 1. Which vintage TI calcultor did you use/own besides your HP beauty and what did you use that TI beast for? 2. Which graphics TI calculator do you use now and what tasks do you use it for? Happy Programming!
Namir
Re: Preferred TI calculator??? - Philippe - 01-28-2006 Well......
TI 58
By the way, who knows how to repair the card reader of the TI 59 Re: Preferred TI calculator??? - Gene - 01-28-2006 I was actually a TI user until the HP41c was announced. TI: More memories (TI59 - 100, HP67/97 - 26?) and more program steps (960 vs. 224), which really DID allow for more complicated problems to be programmed at times in the TI machines...and they were so much cheaper for a poor student! But, programming in AOS was really painful. Then the HP41c was announced and I was transfixed. Alpha on a calculator! Redefined keys! Forgot TI even made calculators! :-) The TI's I used until then were: SR-16II (my first), SR-51A, SR-52 (bought second hand for $70 in 1978), TI-58C.
Graphing TI model? Forget it. Have a TI-84plus in case my son has to use that specific model in HS math classes, but otherwise...
Re: Preferred TI calculator??? - Geir Isene - 01-28-2006 1. My first calculator: TI-57. Then I borrowed a TI-59 from a friend (with a PC-100C printer). I used the 57 to learn to program and the 59 to perfect it. I used the 59 to create self-modifying/program generating code.
2. None. I was grabbed by the HP-craze after my TI affair :)
Re: Preferred TI calculator??? - Vassilis Prevelakis - 01-28-2006 Gene wrote: not "and". Unlike the HP-67/97 where you had 224 steps AND 26 registers, the TI-58/59 had a movable partition (like the HP-41) so you could change the split between program and registers. The default config was 480 steps and 100 registers, so with 30 registers you had 720 steps which *is* more than the 224 steps on the HP67/97, but the comparison is deceptive as the HP67/97 had more merged instructions (e.g. GTO A would take one step on the HP-67/97 but two steps on the TI-58/59. All in all I'd say that the TIs could support programs twice as long as the HPs, which was a real advantage.
> and they were so much cheaper for a poor student! Indeed, but they were of significantly lower quality. The keyboard in particular was horrible.
> But, programming in AOS was really painful. Absolutely! Though, you forgot to mention the printer (PC-100C). While the HP-97 beats the TI-59 + PC-100C hands down for quality, elegance, usability and looks, the TI approach allowed you to move up to a printing calculator when you could afford to do so while retaining the portability of a handheld calculator. With the HP-67/97 you need to have both of them (at a cost of more than $1000, serious money even nowadays). For some strange reason, the PC-100C was a quality product. It was well built, solid, and was FAST! Boy was it fast! It had a row of thermal dots so it could print an entire line of dots at one time without moving the head (the paper moved against the print head). Compared to the PC-100C, printing on an HP-97 gives you the impression that the 97 is doing you a favour :-) **vp
Re: Preferred TI calculator??? - John Noble - 01-28-2006 The best TI calculators: A) My wife's TI-92+, after it sells on eBay.
B) Any of them at 9.789 m/s^2. As you can see from the equation, the resulting improvement varies as the square of 's'.
Re: Preferred TI calculator??? - Howard Owen - 01-28-2006 Going back to school in my early twenties, I used a succession of TI-30s and TI-35s for ordinary scientific calculations. They would break, and I'd buy another one - completely disposable. I wanted a TI-59 because one or two other students I knew had them. But before I could get enough money together out of tutoring wages, I saw the 41C in the bookstore. The alpha capability, and the expansion just floored me. I saved a while longer than I might have otherwise and bought the 41, then a couple of memory modules, then a quad memory module, then a card reader. That machine was stolen from me as I slept on the lawn after class one afternoon. (Laziness was ever my downfall) So I saved and bought a 41CV. Any thought of a TI calculator was banished by the 41. I recently bought a TI-59 + PC-100C printer. The 59 lacks a battery pack or battery cover, or I might play with it more. I also bought a TI-92+ to see what the last generation's top-of-the-line was like. I intend to play with them both some more. However I still have lots of projects lined up on HP machines, so it may be a while until I get around to it.
Regards, Re: Preferred TI calculator??? - Gene - 01-28-2006 good points...quite true!
Re: Preferred TI calculator??? - Karl Schneider - 01-28-2006 I received a TI-30 (original LED version) for Christmas 1978 (I think) and was quite delighted. I had been intrigued by some Casio models at the time, and had seen expensive HP models before, but the TI met my needs perfectly. Unfortunately, it had a 9V rechargeable NiCd battery that quickly lost its ability to hold a charge. One had to plug the calc into a nearby wall socket to use it. I started using disposable 9V batteries, until one of those went dead in electronics class in 1980-81. I hooked up the calc to a regulated DC power supply at 9.0 V, but might have done so backwards, as the display broke up and died. The TI was replaced in Fall 1981 by a Casio fx-3600P (I hadn't the chutzpah to ask for a US$300+ HP-41C!), which I used until I bought an HP-15C in Fall 1983. I bought a cheap TI-36X as a disposable for "old times' sake" in 2002 (or so), then got into HP collecting that year. I'm intrigued by the TI-89, which seems to be an easier-to-use product with better firmware than the HP-49 series. Several of my younger colleages have TI-89's. However, I haven't yet committed to get one.
-- KS Edited: 28 Jan 2006, 9:18 p.m.
Re: Preferred TI calculator??? - Garth Wilson - 01-28-2006 I don't have any experience with any TI's newer than the 59, but I got an awful lot of good use from first the 58c and then the 59 before I had the HP-41cx. I also had the printer and used its alphanumeric capability a lot. I had four modules (the most valuable being the electrical engineering one), and a bunch of applications books, and a pile of users' group publications. My biggest program needed about 1500 bytes, so it would prompt for the appropriate cards if you'd call a part that wasn't in the memory at the time. That would of course mean overwriting another part; so if you needed that again before you were done, it would call for the other cards again. The major weaknesses of the 59 that immediately come to mind were the batteries' lasting less than four hours per charge, the memory's forgetting everything when you turn it off, only being able to hold one program at a time (unless multiple programs were planned around each other so they didn't require the same memory space and labels), only being able to hold one module at a time, the modules' only being able to hold user code, and the resulting slowness. There was no alpha capability without the printer, and the keyboard was cheap, and there were a lot of other less-major weaknesses; but the one thing that really drove me to the HP-41 was the fact that the TI had no I/O that could be interfaced to anything else. Still, the owner of the ti95.com website had the gall to say the TI-59 is the best calculator in the world. Go figure.
Re: Preferred TI calculator??? - Massimo Gnerucci (Italy) - 01-28-2006 Quote:
1A I presently own: SR50, SR52(3), TI58/58C/59(some) and PC-100, SR10, TI30, TI2550, 74S(3), TI68. Quote: 2 I only own a Voyage 200: tried it for a little while (since I once used Derive for DOS) and came back to HP.
Re: Preferred TI calculator??? - Palmer O. Hanson, Jr. - 01-28-2006 My experience is that the PC-100A was a higher quality product than the PC-100C. The PC-100A was also quieter. To see the ultimate in what could be done with the TI-59/PC-100 combination go to Viktor Toth's site at www.rskey.org/, click on "The Library, click on "Texas Instruments", click on "PPC Notes" and click on "Volume 8 Number 2".
Re: Preferred TI calculator??? - Palmer O. Hanson, Jr. - 01-28-2006 The TI-59 was clearly the most powerful hand-held calculator during the three years from it's introduction in June 1977 until the introduction of the HP-41 in early 1980. It had more user memory than the HP-67, it had the Solid State Software modules which offered a wide range of subroutines which could be accessed by user programs, and it had a printer connection. I didn't purchase an HP-41 when it came out because I couldn't afford it. When the time came that I could afford it the Radio Shack Model 100 had become available. I bought a Model 100 which offered a fourteen digit mantissa versus the ten digit mantissa in the 41, programming in a higher order language (BASIC) as opposed to the lower order language (RPN) in the 41, a built-in RS-232 connection, a built-in modem and a screen which supported graphics years before Casio offered the first graphing calculator.
Currently, I have a working HP-67, HP-28S, HP-41C, HP-41CV and HP-41CX all of which I purchased at thrift stores and garage sales. I got the CX and a fully functional TI-59 for two dollars each at a thrift store where they were being sold in the same bin with TV remote controls!
Re: Preferred TI calculator??? - Gerson W. Barbosa - 01-29-2006 1. In 1983 as a Physics sophomore I used a TI-59, not that this was really needed but because I liked it. I remember I used it to evaluate a series for computing Pi I had 'discovered' using Fourier's series... a very very slowly convergent series first described at least two centuries before by a Fourier's countryman as I found out later... Oh, I used to use it at work too, as a military technician. My colleagues were amazed when I measured the diameter of a copper wire, enterered it on the calculator and it immediately displayed the AWG number :-). The calculator seemed very powerful then, mostly when I remembered just four years earlier I did my calculations with the help of a logarithm table (calculators were just unaffordable then and slide rules didn't provide the accuracy I needed..., I didn't have one either). Too bad thieves broke into the house I lived with work colleagues then while we were at work and took it away... But then I would not have moved towards HP... 2. None. I just cannot get used to algebraic calculators any more. I always make mistakes when I try. I know there are people here who switch easily from one to another. Perhaps I should try harder... My inability to use the Windows calculator once made me (almost successfully) try to replace it: My (brave) attempt to replace the Windows calculator Regards, Gerson.
Re: Preferred TI calculator??? - marais - 01-29-2006 MY all-time favourite is still the Datamath!
Re: Preferred TI calculator??? - Marcus von Cube, Germany - 01-29-2006 I started with TI calculators at school when I was 16. The only caculator I had ever seen before was the HP 35 (see my Memories). HPs were simply unaffordable back then so I went for an SR-51A. At that time my teacher just had an SR-50 while my classmates were still using logarithm tables and slide rules in the math and physics classes. Still at school, I switched to my very first programmable, an SR-56, giving my SR-51A to my sister. I added the PC-100A printer (the one that could connect to three different calculators, namely the SR 52, the SR 56 and the TI58/59 series.) This combo was seriously tweaked as my programming workbench but nothing is left from that era. Later at University, when I had just seperated from my girl friend, I had left some spare money originally saved for a vacation for two. I spent it on a TI-59 (kind of revenge: my former girl friend's new lover just had an SR-52!). The TI-59 was my main computing device in the first few years at university. I wrote some software for it and even made one listing appear in the German computer magazine "Chip". When the HP 41 appeared it was too late: I soon switched to a "Home Computer" (EACA Video Genie, TRS-80 clone) in 1980 or 81. This made my interest in calculators fade and it was the starting point for my current profession - I'm a professional programmer for over 20 years now. From time to time I picked up some interesting machines just to play around a little: Casio PB-700, TI CC-40, TI-74 Basicalc, TI-95 Procalc, Sharp PC-1261. I still like them all. My first genuine HP was the HP 200lx, my "brain substitute" for several years, until replaced by a Psion netBook. Some time ago, eBay provided a chance to get back to all my old calculators which had either failed or were sold or given away since long. Now I own a bunch of HPs (11C, 12C, 15C, 16C, 25(C), 28S, 33S, 35, 41C/V/X, 42S, 45, 48G, 49G+, 97, 200lx, 720), Casios, Sharps, an Epson HX-20, a TRS-80 Model 100, and, of course, many TIs. I still don't really use any of these but I love to play around with them, solving more or less complicated problems mentioned in this forum. (Thanks to Valentin and other contributors who have helpd to awaken my mathematical brain which had slept for so long!)
I have the following working TIs in my collection (in numerical order): TI-25 (early LCD) Many of the LED machines have such a bad keyboard that I barely use them. The older machines (50, 51, 52, 56) are better then the later models (30/57/58/59). From the next generation, I like the TI-95, the last keystroke programmable from TI, and the Basic programmables. Playing around with the old peripherals is pure fun. On the more modern side, I like the TI-92 Plus. This machine is solid like a brick, has a QUERTY keyboard and a huge display. I mainly use its connection to the CBL and/or CBR. The latter are educational devices, not serious lab equipment, but they provide a well designed link between the calculators and the "real world". You can have the CBL collect temperature and lighting data during 24 hours and have the calculator graph the results the next day. CBL can be operated on external power which saves on batteries. CBL and CBR work well with most of the other graphics machines (except 81, rexstricted on 85). Software is available for free, mostly written in TI user code (sometimes referred to as "TI-BASIC" which it isn't.) The Voyage 200 has the same operating system as the TI-92 Plus but more memory in a smaller footprint. I don't like the keys which are a little too tiny. While the TI-89 has the same CAS and is even more pocketable, its keyboard layout isn't very well suited to the vast functionality. From the non-CAS graphics I prefer the 85/86 series for which production and development has sadly stopped, in favour of the less capable 81/82/83/84 line. The latter have only one-letter variable names and a less capable programming model while the former have long variable names and a more complete programming dialect. I like the 85/86 menu system better then both the systems in the simpler series and the CAS machines.
Marcus
Re: Preferred TI calculator??? - John Smitherman - 01-29-2006 Quote: 1. None. I gave up on older TI's after purchasing an HP-34c in 1980. 2. Non-graphing: My 12 year old son uses a TI-34II periodically to check his pre-algebra homework. His teacher doesn't allow calculators in the classroom. The 34II is a nice machine and I found it on sale at Office Depot for $2.97. Graphing: I have a TI-83+ Silver Edition that I use from time to time to graph functions, manipulate matrices and calculate statistics. Regards,
John
Re: Preferred TI calculator??? - Bob - 01-30-2006 My favorite TI is whichever of the many TI36X solar-powered units that I have picked up at a local flea market. I have written several times about buying them for $6-7 each when buying several of them at once. They are still selling around here for about $19. I go back to that well every now and then for more. For that price, I can give them away, drop them, travel with them, or loan them out without worry. Just pull the drawer open, pull out another unit, and open the blister pack. While the key feedback is not great, they are dependable, have plenty of computing power most of the time, and have a hard case. If I need more power, I pull out one of my 48GX's or turn around to the PC.
Re: Preferred TI calculator??? - Ron Ross - 01-30-2006 I used a Ti-55 before switching over to an Hp15c. Ti even exchange my old 55 for a newer Ti-55ii, but its keyboard still sucked! I had purchased an Hp15c when the keyboard of the Ti-55 was shot, then heard about the exchange program that Ti had. Until I got my new Ti-55ii, I was thinking about what a dope I was to buy a $100 calculator so quickly. That thought changed when I got my hands on the new Ti-55ii. Yep! Same Ti keyboard, glad I have an Hp, is what went through my head. A friend of my bought the new Ti-66 and was really happy with it. Years later, I bought a Ti-66 and can see why (of course the Ti-66 was really made by Tosiba). I have a good representation of the Ti graphics line, basically one of each family. I really have a dislike of the Ti-83/84 line as it is crippled in so many areas (but that is by design as Ti can sell another graphics, when you out grow this model). It does work as a general purpose graphics calculator. Shamefully, Hp followed suite with the Hp38/39G family as well.
I myself like the Ti-86, simple, yet powerful, with an easy to read screen. The Ti-89 may be far more powerful, but I find its units conversions awkward to use in comparison to the Ti-86, the screen very difficult to read, and its keyboard layout is awful (second shifting the trig functions).
Re: Preferred TI calculator??? - Palmer O. Hanson, Jr. - 01-30-2006 One of the real problems with the TI-82 and T-83+ is that there are some instances where the devices fail to calculate determinants properly. I have seen two instances where my TI-82 and TI-83+ calculate the determinant of a matrix as zero but my TI-85 calculates the determinant properly. The first case appeared last year when I was investigating the ability of various machines to find the determinants of sub-Hilbert matrices from order 7 to 10. The TI-83+ and TI-85 gave identical answers for orders 7 through 9. For order 10 the TI-85 gave the answer 2.207089...E-53 where the decimal equivalent of the exact answer obtained from the HP-49G is 2.164179...E-53 . The TI-83+ gave zero. I did not have a TI-82 at the time. The second case appeared this year when working with the following linear equation problem proposed by Valentin Albillo:
1.3 x1 + 7.2 x2 + 5.7 x3 + 9.4 x4 + 9.0 x5 + 9.2 x6 + 3.5 x7 = 45.3 where the system has the unique solution: x1 = x2 = x3 = x4 = x5 = x6 = x7 = 1.0
The exact determinant of the matrix is 1E-07. My TI-85 gave 0.990927530944E-07. Both my TI-82 and TI-83+ gave zero. This is not an easy problem. Determinants yielded by some other machines were HP-41 Math Pac -86.31E-07Rodger Rosenbaum modified Valentin's problem by changing A(3,7) from 6.7 to 6.8, changing A(7,7) from 6.1 to 6.0, and changing B(3) from 45.0 to 45.1. The exact determinant of the matrix becomes 798.9713675. The TI-82, TI-83+ and TI-85 calculate the value 798.97136749978 . Determinants from some other machines were HP-41 Math Pac 798.9713752Rodger's changes have essentially dumbed-down the problem so that almost any machine can solve for the determinant and get reasonable answers. If one goes ahead and solves the linear equations using X = INV A * B then the solutions from the TI-82, the TI-83+ and TI-85 are exactly the same. If one uses the simultaneous equation function of the TI-95 one get a slightly more accurate solution. The TI-82, TI-83+ and TI-85 all use a fourteen digit mantissa so it is not surprising that the three machines get the same results when they are asked to do the same thing. I can't explain the occasional improper evaluation of a determinant.
Using multiple modules with the TI-59 - Palmer O. Hanson, Jr. - 01-30-2006 A company known as American Microproducts sold devices which allowed the user to connect multiple Solid State Sofware modules to the TI-59 calculator. I have one where the user manually switches the modules. I sort of remember that they also sold a unit where the user could switch modules under program control but I haven't found the reference.
Re: Preferred TI calculator??? - Valentin Albillo - 01-31-2006 Hi, Palmer: Palmer wrote:
"Rodger Rosenbaum modified Valentin's problem by changing A(3,7) from 6.7 to 6.8, changing A(7,7) from 6.1 to 6.0, and changing B(3) from 45.0 to 45.1. The exact determinant of the matrix becomes 798.9713675."
Speaking of jokes, this whole situation strongly reminds me of this well-known joke:
here." This man would do well to search for his keys where he lost them, if he's to find them out. The moral is clear: if your solving methods or machines can't deal with the original problem, you'd do well to change your methods and/or machines, as solving *another* problem simply won't do. You'll never find your keys that way. Best regards from V.
P.D: By the way, never mind TI's, my SHARP PC-1475 has no problem at all solving the original problem, what with its 20-digit double-precision math. Re: Preferred TI calculator??? - Mark A. Ordal - 01-31-2006 In answer to Namir's two questions:
1. Which vintage TI calculator did you use/own besides your HP
My first TI was an SR50. I had wanted the HP35 when they first
I was pretty pleased with the SR50 for most of Spring quarter.
In August of 1975, I saw an advertisement for an HP25C in Time
My HP25C arrived in the middle October of 1975 and I was very
NOTE: currently, the HP Museum site incorrectly lists the
I will admit I was tempted by the HP29C when it came out, but I
I later sold the HP41CV to help pay for an HP75C. In the spring
For a brief period, I had the habit of buying whatever the newest
2. Which graphics TI calculator do you use now and what tasks do
I use the TI Voyage-200 for just about everything. Of the
I bought a TI-84 Plus SE mainly for working with TI's CBL
I realize that students need to worry about the QWERTY keyboard
For old eyes, I find the TI-89 and TI-89 Titanium hard to use.
One further thing to note about the TI-89/92/Voyage-200 models is -------------
--Mark
Preferred TI calculator??? Oxymoron right? 8-) - Matt Kernal - 01-31-2006 Preferred TI calculator??? "Does not compute", said the mechanized female voice (known only as "computer") from the original 60's Star Trek episodes. j/k :-) Matt
ps. OK, I'll admit I had a TI30 in middle school in the seventies. Currently have a TI Programmer (also from the 70's), a TI ProCalc95 w/ printer, a TI92, and a TI Voyage200. Anyone interested in any of these (trades for HP's preferred)?
Re: Preferred TI calculator??? - Palmer O. Hanson, Jr. - 01-31-2006 Valentin: I admit that I don't really comprehend where we are going with all of this. I have been following Rodger's lead trusting that I will learn something in the process.
If you go back and review some of the threads covering Rodger's work with your original problem and with modifications to it you will find that his first two modifications only involved changes to single elements of B. Only fourteen digit machines delivered reasonable results. Other machines delivered X elements which were an order of magnitude in error and of the wrong sign. Rodger's third modification involved the changes mentioned to A(3,7), A(7,7) and B(3) previously mentioned. All machines then got excellent results, even my Model 100 operating in single precision mode which then has a mantissa of only six digits.
HP25c introduction date... - Gene - 01-31-2006 Mark wrote: "My HP25C arrived in the middle October of 1975 and I was very content with it for quite a while. NOTE: currently, the HP Museum site incorrectly lists the introduction of the HP25C as 1976. (I've emailed David Hicks about this issue.)" Gene: Actually, in this case, you are incorrect. :-) The HP25C was introduced on July 1, 1976. This was covered in the 1976 issues of the PPC Journal. I guarantee that the 1975 issues of the PPC Journal do not mention the HP25c introduction in that year. It was introduced in 1976. Link to July 1976 PPC front page in PDF format (Note: I took this page from TOS) And, Craig Finseth's excellent dump of HP calculator information also lists the date as 1976.
So, very much more likely that somehow you've got the year's mixed up.
Re: HP25c introduction date... - Mark A. Ordal - 02-01-2006 I can't help you on your publications Gene. The dates I cited are correct! That Fluid Dynamics course I mentioned was Spring quarter 1975; I saw the advertisement for the 25C in August of 1975; and I received my 25C in October of 1975. I can't explain the discrepancy with your sources.
--Mark
Re: HP25c introduction date...was July 1976, not October 1975. - Gene - 02-01-2006 I know you believe you are correct, but multiple sources contradict your memory. I believe probability suggests that your memory is the one that is not correct. That explains the discrepancy. Sorry! The HP25C was introduced July 1976, not in 1975.
Any other HP users believe it was 1975?
Re: HP25c introduction date...was July 1976, not October 1975. - Tom F - 02-01-2006 The HP Journal indicates, along with other information on this site, that the HP 25 was introduced in 1975. The HP-25C was, in fact, introduced in 1976. Perhaps that is where the confusion or foggy memories come to play. http://www.hpmuseum.org/journals/journals.htm http://www.hpmuseum.org/adverts/adverts.htm
Tom
Re: Preferred TI calculator??? - GE - 02-01-2006 Interesting thread. Re: Preferred TI calculator??? - Marcus von Cube, Germany - 02-02-2006 GE,
Quote: From a theoretical (information technology) point of view this is a desirable feature! Why? These functions cannot have side effects, the output is completely defined by the input. If you really need side effects, just write a procedure that acts on global variables.
Quote: That would be equally true for the TI-74. As a student I was looking for such a beast and came across the Casio PB-700. Nice screen, reasonable keyboard but way to sloooooooow. Another very interesting machine is the Casio PB-2000C which is programmable in a C dialect (pre ANSI, no switch/case). (All links go to Viktor Thot's excellent RSKEY site: http://www.rskey.org).
Marcus
Re: Preferred TI calculator??? - GE - 02-02-2006 There are many cases when those side effects are desirable. Functions() and Global Variables - Marcus von Cube, Germany - 02-02-2006 GE, It's no at all OT, because this is a general programming question. Just to keep other readers informed what our discussion is all about:
I think it is a good idea to restrict functions in this way but GE complains. GE, let me answer some of your points:
>> There are many cases when those side effects are desirable. >> 1. based on a table of coefficients
>> 2. which returns many results
>> 3. which output trace information
>> 4. which is defined based on itself and can be accelerated
If you really need state inside a function it is better to write a program instead and have it return a value (you can pass a variablename as a string and store the result into it or you can create some global variables in a special directory an modify these.) >> 5. very deeply recursively defined, overflowing the built-in subroutine stack.
>> 6. which needs some input at some point (yes, this one is weird)
>> 7. not numeric, but handling the user interface (example CreateWindow()...)
>> By the way, procedures cannot access the caller's local variables either,
There is a paradigm called "Functional Programming" (Wikipedia) which relies totally on side effect free coding. Everything is treated as a function! Marcus
Edited: 2 Feb 2006, 9:06 a.m.
4-line displays (was Re: Preferred TI calculator???) - Valentin Albillo - 02-02-2006 Marcus wrote:
" hat would be equally true for the TI-74. As a student I was looking for such a beast and came across the Casio PB-700. Nice screen, reasonable keyboard but way to sloooooooow."
Nevertheless, as I have as many as four or five SHARP PC-1350 models, all acquired en-masse in eBay for peanuts from a seller that was clearing some obsoleted surplus military equipment (which used preprogrammed PC-1350 for artillery computations), I use one of them all the time, as an all-use, scratch machine, and it's as comfortable, easy to use, and powerful programming and calculator environment as it gets. I did enter several very short programs I specifically wrote to compute integrals (Gauss), solve for roots (enhanced Newton) and do matrix inversion, and I can do with it most anything I want or need, very fast, and still got 12 Kb or so for one-shot programs or variables. And the extreme usefulness and ease of programming afforded by the 4-line screen can't be stressed enough, a real pleasure. Getting back to the 22-char, 1-line display of the HP-71B feels unbearably cramped in comparison.
Matter of fact, I'd rather prefer HP had issued a C/Assembler ROM for the HP-71B instead of the actual FORTH/Assembler ROM. After all, there's also a full FORTH-language system in the 41C Translation ROM, so who needs two incompatible, distinct FORTH implementations ?
Edited: 2 Feb 2006, 9:52 a.m.
Re: Preferred TI calculator??? Oxymoron right? 8-) - Palmer O. Hanson, Jr. - 02-04-2006 I have a like new made in the USA HP-12C in a slip case with a spiral bound manual. Is your equipment in working order? I don't need the TI-30.
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