Are these rare and difficult to obtain? I have been looking for a while now, and have not seen any for sale.
Regards
John
HP71B Maths Module


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05032012, 02:37 AM
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05032012, 03:02 AM
If you can't get hold of one, I've found a way to put the contained LEX file in RAM (you need a memory expansion of sufficient size, though). Link to article 908.
05032012, 03:11 AM
Hello!
Quote: Yes, unfortunately. I have 4 HP71Bs, but only one Math module. I don't know if this comes close to the overall statistics, but expect to pay more for a math module alone than for the calculator!
Regards,
05032012, 05:13 AM
Once upon a time there was a seller offering EPROMs with the contents of said module at TAS. I bought one and still have it  I may even find the seller's TASalias after some excavating, if you're interested.
05032012, 05:32 AM
Quote: Somewhat rare indeed, though matter of fact I own four.
The first one I bought at the time of its release back in the 80's. That said, I heartily recommend you do whatever it takes to get a Math ROM (sorry, I'm not selling) as it's the most essential addon for the HP71B if you're into math, engineering, business, or whatever. One of the most wellrounded pieces of math software ever made, all in 32K of fast, optimized assembly language. If in doubt, have a look at any of my articles here: HPrelated Articles by Valentin Albillo most especially both Math ROM Baker's Dozen ones. They'll make a convert out of you ! ... :D These two posts to this site are also "mandatory" reading as they show just how immensely capable the Math ROM functionalities are and how easy and natural they are to use :D ... HP71B Math ROM (The turtle and the hare) The turtle and the hare: the harder 2nd part On a final note, I use the HP71B + Math ROM a lot each and every day (in their emulated form for convenience), both for serious work and for leisure. The leisure part is solving Project Euler challenges in a few lines of code using it instead of the usual C/C++/C#, Java, Python, Haskell, etc. So far, so good.
Regards from V. ▼
05032012, 06:00 AM
Thanks for the responses, truly great people on the forum. ▼
05032012, 07:33 AM
Quote: Thanks to you for your kind words and interest in my humble HPrelated productions and I wish you the best of lucks in getting the Math ROM. When you eventually do, which I'm sure you will, you can try it with the following textbooklike problem, which is solved quickly and effortlessly: "The region R between the spheres of radius 4 and 5 is filled with a material whose density is given by D(x,y,z)=1+x^{2}+y^{2}. Find the mass of this region."
My quick'n'dirty 4line HP71B + Math ROM solution is:
where IDENTIFY is the parameterless invocation of my constant recognition subprogram as featured in one of my articles, namely Boldly Going  Identifying Constants downloadable from the link I previously gave. So, as you can see, a complicated tripleintegral problem is numerically solved in just 4 lines of simple Math ROM code, plus full symbolic recognition available as well if needed. What more can one ask for ? ... :D
Regards from V.
05032012, 12:04 PM
Quote: If your 71B is equipped with HPIL then the PIL Box by J. F. Garnier (http://www.jeffcalc.hp41.eu/hpil/index.html) may help you out. It's a USB to HPIL interface allowing access to emulated disk drives on the PC.
05032012, 03:33 PM
john, i have two of these but need only one. the one i'd let go is working fine (just tested it a few minutes ago), but its case was cracked when i got it, and i had to use some superglue to fix the damage. it's not a collector's piece, but if you are more interested in the performance of the module than in the looks, then you might be interested (no manual, no box, btw.). wouldn't cost you a fortune, but it is very likely that shipping would be more than the module!
best regards, ▼
05042012, 02:14 AM
Hi Hans, I have sent you an email.
05042012, 04:27 AM
If anyone else has a spare, I might be interested.... My 71B is lonely without this essential extra.
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05042012, 05:49 AM
Don't you have enough RAM and HPIL gear to download the LEX file to it? ▼
05042012, 05:56 AM
I have no HPIL gear at all and only two 4k RAM modules. So no, that isn't an option for me :( Part of the reason the FRAM71 project is so interesting.
05042012, 06:14 AM
Quote: The saddest thing is, the Hp71B was meant to include full complex number support builtin right from the get go, as well as other advanced Math ROM functionalities, which would have been absolutely great. Just for instance, try entering this as a program line with no Math ROM plugged in:
10 A=(2,3)*(3,4)+SIN((3,7)/(3*A+5,2*A6)) and see that you actually can, without a syntax error ever appearing. Most regrettably, instead of including such wonderful math capabilities some jerk insisted on implementing instead the utterly useless "CALC mode", which took large portions of available ROM space, as well as the equally utterly useless IEEE support, which did the same. The final outcome of such tomfoolery was that there was no space left to include complex support, matrix support, etc., so they were committed to an expensive separate Math ROM which eventually became a rarity, greatly crippling the HP71B in the process. As far as I'm concerned, an HP71B can be considered a real HP71B if and only if it's got the Math ROM plugged in (or somehow accessible in RAM), else it's just a sore "Crippled HP71B" of sorts. XD
Best regards from V. ▼
05042012, 06:24 AM
Quote: I certainly agree about the CALC mode. However, the IEEE standard is actually very good and provides almost exactly the features you need to write numeric programs properly. Dr Kahan had his very adept fingers in this pie too. Now I've just got to find a maths module.
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05042012, 07:20 AM
Same for me, I finally have an HP71B (thanks again A. G.) but no math rom ... but an HPIL module .... so I will look for a PIL box sooner or later ▼
05042012, 08:17 AM
Olivier, you will need about 32K RAM to spare. The MATH.LEX file isn't a tiny(*) piece of code. ;) (*) Compared to what compiled C code would need it's pretty compact. ▼
05042012, 08:58 AM
Quote: Not only is it pretty compact but, most astonishingly, essentially bugfree, which considering the tons of complicated code and vast diversity of algorithms implemented (made even more convoluted by the dreaded IEEE conformity), is all the more amazing. I do consider it a marvelous piece of software though of course there are aspects which deserve some criticism, mostly having to do with some strange omissions among the complexnumber and matrix function set, I addressed some of them in my Math ROM Baker's Dozen articles.
Best regards from V.
05042012, 04:59 PM
Marcus Is that just under 32K of RAM, that is, would it fit on a 32K RAM module? If so, guess I will need to add a PIL box to my list of things to get! Cheers James
05042012, 10:50 PM
Quote:Very well put! ▼
05072012, 04:48 AM
Quote: Thanks ! When I think of the many priceless Kb of main RAM they wasted on that useless, ridiculous gimmick implemented only to please some moron(s) that insisted on a "calc mode" for what was essentially the most powerful handheld computer of the time, badly crippling its advanced math capabilities, I really see red. If they wanted a "calc mode", whose utility is more that questionable on such a machine, they could've included an immediate RPN mode, say, which would have taken less than 1 Kb of assembler code to implement and would provide decent calculator capability. If they really, really wanted a convoluted, useless algebraic "calc mode", they could've implemented it as part of an external ROM which interested users (if any) could buy. Bur removing complexnumber and/or matrix capabilities from the mainframe to make room for that crap is utterly unforgivable. Probably either another "triumph" of moronic marketing versus sound engineering or some jerks' ego trip to prove that they could do it.
Best regards from V. 