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HP 28s rom dump with 50g - Printable Version

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HP 28s rom dump with 50g - Jlouis - 03-23-2015 12:50 AM

Is it possible?

TIA

JL

RE: HP 28s rom dump with 50g - cyrille de brébisson - 03-23-2015 06:28 AM

Are you talking about getting a 28 working on a 50g or to do a 28 rom disassembly on the 50g?

28 has a 128KB rom (if my memory serves me well).

So, it fits in the 50g. so, technicaly, you could do both...
But it will take a lot of SW to acheive t.

Cyrille

RE: HP 28s rom dump with 50g - Jlouis - 03-23-2015 10:45 AM

(03-23-2015 06:28 AM)cyrille de brébisson Wrote:  Are you talking about getting a 28 working on a 50g or to do a 28 rom disassembly on the 50g?

28 has a 128KB rom (if my memory serves me well).

So, it fits in the 50g. so, technicaly, you could do both...
But it will take a lot of SW to acheive t.

Cyrille

Hi Cyrille,

I want a rom dump from my 28s in order to use on an emulator.

I have an 48gx, but I read in this forum that I have to have a 128k card in slot 1 merged in order to dump the 28s rom. I don't have the card (too expensive), so I thought if using a 50g could help (Infrared, lots of memory available), but I have no idea how to do it.

Thanks for any enlightment on this matter.

Cheers

RE: HP 28s rom dump with 50g - Jlouis - 03-23-2015 10:47 AM

(03-23-2015 09:39 AM)Mike (Stgt) Wrote:  Please see this recipe from Christoph Giesselink. He uses an HP48, try it with your HP50 and tell here about your success.

Ciao.....Mike

Hi Mike,

I will try.

Thanks a lot.

Cheers

RE: HP 28s rom dump with 50g - jebem - 03-23-2015 11:59 AM

(03-23-2015 10:47 AM)Jlouis Wrote:  
(03-23-2015 09:39 AM)Mike (Stgt) Wrote:  Please see this recipe from Christoph Giesselink. He uses an HP48, try it with your HP50 and tell here about your success.

Ciao.....Mike

Hi Mike,

I will try.

Thanks a lot.

Cheers

I have followed the excellent Christoph Giesselink work/information, and did use a HP-48G+ (that have plenty of internal memory for this job) to do a rom dump for another HP model (a 27S).

RE: HP 28s rom dump with 50g - RMollov - 03-23-2015 01:48 PM

(03-23-2015 11:59 AM)jebem Wrote:  I have followed the excellent Christoph Giesselink work/information, and did use a HP-48G+ (that have plenty of internal memory for this job) to do a rom dump for another HP model (a 27S).
IIRC HP48g+ has only 128 KB RAM and not all of it available to user. So obviously hp28 ROM can't fit if it is as big as Cyrile says above.

RE: HP 28s rom dump with 50g - matthiaspaul - 03-23-2015 01:49 PM

I have read reports that BINPRT doesn't work on the HP 49g+, so it may not work on the 50g as well. But please try it, so we know for sure.

I may be pointing to the obvious, but one significant difference between the HP 48GX/G+ and the HP 48gII/49g+/50g is that the later only support IrDA, whereas the former only support a proprietary HP SIR protocol. Another difference is the emulation layer.

However, this should only be a problem for BINPRT for as long as the hardware/emulator would provide the received data byte-wise already. If the hardware/emulator allows to log away the raw bit-wise stream of state transitions of the IR receiver itself, it shouldn't matter. Since I have never programmed the IR port on these machines, I do not know the answer to this question, but I'm sure others will. Is the source code to BINPRT available anywhere?

Greetings,

Matthias

RE: HP 28s rom dump with 50g - Christoph Giesselink - 03-23-2015 05:55 PM

(03-23-2015 10:45 AM)Jlouis Wrote:  I have an 48gx, but I read in this forum that I have to have a 128k card in slot 1 merged in order to dump the 28s rom.

This information is obsolete. Indeed only the first version of this recipe from Christoph Giesselink has had this limitation. The actual version of CLAMSHEL.TXT from Feb. 2007 inside, describes also a variant in section "2.2) ROM upload in parts".

Christoph

RE: HP 28s rom dump with 50g - Jlouis - 03-23-2015 09:55 PM

(03-23-2015 05:55 PM)Christoph Giesselink Wrote:  
(03-23-2015 10:45 AM)Jlouis Wrote:  I have an 48gx, but I read in this forum that I have to have a 128k card in slot 1 merged in order to dump the 28s rom.

This information is obsolete. Indeed only the first version of this recipe from Christoph Giesselink has had this limitation. The actual version of CLAMSHEL.TXT from Feb. 2007 inside, describes also a variant in section "2.2) ROM upload in parts".

Christoph
Thanks a lot, Christoph.

I will try this.

RE: HP 28s rom dump with 50g - JDW - 07-16-2016 08:01 AM

(03-23-2015 11:59 AM)jebem Wrote:  I have followed the excellent Christoph Giesselink work/information, and did use a HP-48G+ (that have plenty of internal memory for this job) to do a rom dump for another HP model (a 27S).

I've read through Christoph Giesselink's "CLAMSHELL.TXT" and see that a 28S ROM dump can be done with a base 128k model 48GX in 2 parts or all at once with a 128k card used as merged RAM. Even so, specifics on how to use a 50g to accomplish this feat, saving the 28S ROM to SD card for easy transfer to PC or Mac, are desirable.

Has no one ever used a 50g to read the entire ROM of a 28S, saving it to SD card?

RE: HP 28s rom dump with 50g - BartDB - 07-19-2016 04:23 PM

(03-23-2015 12:50 AM)Jlouis Wrote:  Is it possible?

TIA

JL

I recall emailing HP support about this when the 50g first came out.
IIRC the response was something about the IR not being compatible between the 28S and the 50g.

RE: HP 28s rom dump with 50g - JDW - 07-20-2016 12:02 AM

Bart, since not one else replied back to my previous post, it would appear you are correct. And the fact, illegal or not, we cannot find a usable 28S ROM online either seems to confirm that pretty much one one has ever done it. I did find one ROM online, but it has a <script> at the end and even after deleting that and reserving, it won't work in the EMU42 simulator (28S displays but clicking ON does nothing).

RE: HP 28s rom dump with 50g - Dave Frederickson - 07-20-2016 01:27 AM

Here's the 28S ROM, version 2BB.

[Image: sl366b.jpg]

RE: HP 28s rom dump with 50g - JDW - 07-20-2016 01:45 AM

It works perfectly in EMU42. A thousand thanks, Dave!

RE: HP 28s rom dump with 50g - Dave Frederickson - 07-20-2016 02:34 AM

Anytime. Smile

I think I downloaded the image from http://quadrophenia6.free.fr/HP/Emulateurs, but that site seems to be down. I did, however, download the entire site a while back, and some other emulators. It's a 1.3GB download, but here it is.

Dave

RE: HP 28s rom dump with 50g - JDW - 07-20-2016 02:39 AM

Dave, I just downloaded and unzipped your archive. Truly the treasure trove of HP Calculator emulators!

Bless you!