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HP 28s rom dump with 50g
03-23-2015, 12:50 AM
Post: #1
HP 28s rom dump with 50g
Is it possible?

TIA

JL
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03-23-2015, 06:28 AM
Post: #2
RE: HP 28s rom dump with 50g
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
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03-23-2015, 10:45 AM (This post was last modified: 03-23-2015 10:48 AM by Jlouis.)
Post: #3
RE: HP 28s rom dump with 50g
(03-23-2015 06:28 AM)cyrille de brĂ©bisson 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
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03-23-2015, 10:47 AM
Post: #4
RE: HP 28s rom dump with 50g
(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
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03-23-2015, 11:59 AM
Post: #5
RE: HP 28s rom dump with 50g
(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).

Jose Mesquita
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03-23-2015, 01:48 PM
Post: #6
RE: HP 28s rom dump with 50g
(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.
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03-23-2015, 01:49 PM (This post was last modified: 03-23-2015 02:07 PM by matthiaspaul.)
Post: #7
RE: HP 28s rom dump with 50g
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


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03-23-2015, 05:55 PM
Post: #8
RE: HP 28s rom dump with 50g
(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
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03-23-2015, 09:55 PM
Post: #9
RE: HP 28s rom dump with 50g
(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.
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07-16-2016, 08:01 AM
Post: #10
RE: HP 28s rom dump with 50g
(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?
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07-19-2016, 04:23 PM
Post: #11
RE: HP 28s rom dump with 50g
(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.


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07-20-2016, 12:02 AM
Post: #12
RE: HP 28s rom dump with 50g
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).
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07-20-2016, 01:27 AM
Post: #13
RE: HP 28s rom dump with 50g
Here's the 28S ROM, version 2BB.

[Image: sl366b.jpg]
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07-20-2016, 01:45 AM
Post: #14
RE: HP 28s rom dump with 50g
It works perfectly in EMU42. A thousand thanks, Dave!
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07-20-2016, 02:34 AM
Post: #15
RE: HP 28s rom dump with 50g
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
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07-20-2016, 02:39 AM
Post: #16
RE: HP 28s rom dump with 50g
Dave, I just downloaded and unzipped your archive. Truly the treasure trove of HP Calculator emulators!

Bless you!
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