HP Forum Archive 18

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Which HP48 to buy for ROM upload Message #1 Posted by Silvio deMorais on 19 Jan 2009, 8:32 p.m. Hello, I want to use Christoph Giesselink's Emu42 program but I need to extract the ROM image from the 42s. Apparently I need an HP48 and the serial PC cable to do this. As I never used the 48 before I would like to know the least expensive one to buy for this specific task. I see some 48S for as little as $50 and the GX going for over $200 sometimes. So what model should I buy? I understand that the 48 is a very powerful machine and probably limiting its use to ROM upload may be seeing as a waste by many (and I apologize for that) but I'm a 41/42 lover and have used those machines daily for almost 30 years... I don't think that will change now :-) Thanks!

Re: Which HP48 to buy for ROM upload Message #2 Posted by Allen on 20 Jan 2009, 12:10 a.m., in response to message #1 by Silvio deMorais 48g+ for upload or free42 Edited: 20 Jan 2009, 12:11 a.m.

Re: Which HP48 to buy for ROM upload Message #3 Posted by Christoph Giesselink on 20 Jan 2009, 5:25 p.m., in response to message #1 by Silvio deMorais Like the Pioneer document describes you need ~70KB of free RAM for a HP42S ROM Upload. Calculator which are fulfill this are HP48G+ HP48GX HP48SX with merged 128KB RAM card The problem is that the HP48G+ is quite rare so it's often cost more or the same as the HP48GX. IMHO early HP48GX manufactured in Singapore with ROM rev. R are worth to buy. Some people swear on the latest ones with the black display from the HP49G. But I think most agree with me that the one manufactured in Indonesia are the worst one. When you aren't a fan like me, buying a HP48 from the S series isn't such a good idea. Most software written in SystemRPL in the last years don't work on a HP48S(X) any more. Because I use an emulated HP48SX for my daily work, I take care that I write software working on the S and G series, but that's definitely an exception. But back to your problem, some like you had the same problem only having a HP48 calculator with 32KB RAM. Two years ago I decided to publish a modified Clamshel.txt file describing also uploading a HP28 ROM image in parts to a HP48. For the Pioneers it's much more difficult, but nevertheless, I wrote such a document describing a Pioneer ROM image upload in parts in January last year. But I wanted to avoid any questions to this complex process, so I decided not to publish this document. I you still want to try it, download the latest version of the CPROMUPL.ZIP package and drop me a mail over MoHPC for request the latest Pioneer upload document. Cheers Christoph

Re: Which HP48 to buy for ROM upload Message #4 Posted by Silvio deMorais on 22 Jan 2009, 11:02 p.m., in response to message #3 by Christoph Giesselink Thank you all for the great input!!

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