Post Reply 
Leonardo meets Emu42
09-17-2021, 09:40 AM
Post: #11
RE: Leonardo meets Emu42
I'm happy that at least a few people are appreciating the Leonardo and Plato ROMs !

Some background on extracting the ROM.
On Christoph's site, you can read: " For [low-end and mid-range Pioneer] calculators you need special hardware and knowledge to extract the data from the Saturn bus system, a way, as far as I know, never gone on a Saturn based calculator".
So it was considered as "almost" impossible.

The 32S is, as I mentioned several times, my preferred every-day calculator rather than the 32SII, and it was a pity that the 32S was not supported in Emu42 due to the lack of ROM.
Some weeks ago, maybe stimulated by the SM projects, I investigated how to extract the ROM from the 32S.
I used an old 32S, partially working (usual kbd issue) that I opened long ago, and carefully looked at the PCB.
Quite quickly I noticed some 10 unused tracks that end to test pads and are not used elsewhere on the PCB.
I had the idea that maybe these test pads were bringing the Saturn bus outside, then with the help of some information from Christoph, I was able to identify the function of the test pads, access the internal Saturn bus and read the ROM. And that’s it !
The needed hardware is actually nothing special: a simple Arduino board is well enough.

[Image: hp32s_pcb2.jpg] [Image: romdmp_setup2.jpg]

Visit this user's website Find all posts by this user
Quote this message in a reply
Post Reply 

Messages In This Thread
RE: Leonardo meets Emu42 - Eric Rechlin - 09-11-2021, 03:44 AM
RE: Leonardo meets Emu42 - J-F Garnier - 09-16-2021, 12:25 PM
RE: Leonardo meets Emu42 - J-F Garnier - 09-17-2021 09:40 AM
RE: Leonardo meets Emu42 - Vincent Weber - 09-18-2021, 11:28 AM
RE: Leonardo meets Emu42 - J-F Garnier - 09-18-2021, 01:10 PM
RE: Leonardo meets Emu42 - Vincent Weber - 09-18-2021, 01:16 PM
RE: Leonardo meets Emu42 - rprosperi - 09-19-2021, 02:39 AM

User(s) browsing this thread: 1 Guest(s)