Olivetti M21/M24 with BIOS version 1.44

[1ST1]

Interesting, please continue to analyze. What would be the reason to change that what you found? Does that BIOs have maybe a bigger list of supported harddisks? Does it have maybe better floppy code / controller initialisation - you remember, that I have a lot of IRQ issues with lowlevel floppy tools (like IMD, Teledisk, ...)?

[Trixter]

I'm spread too thin to continue in a reasonable amount of depth, sorry. Was hoping someone else with more time and less projects could take up the mantle.

Based on a very cursory look over the entire thing, the only major changes I could see was to hard disk operations. I'm guessing they added support for later hard disk models.

[dkedrowitsch]

I just replaced the original v1.43 ROMs in my 6300 with a pair of EPROMs containing the split binary files I attached to this thread the other day. I'm pleased to report this BIOS extract works just fine!

The system boots normally from the original ST-225 and I don't perceive any differences to v1.43 yet.

IMG-5869.jpg

IMG-5870.jpg

[Valerio]

Anybody here bought that M21? The vendor did not manage to read the BIOS with debug. So it's on you to do it.

Sorry for the late reply - that was me. I had it delivered to Italy though, so I won’t get my hands on it till December.

[1ST1]

Sorry for the late reply - that was me. I had it delivered to Italy though, so I won’t get my hands on it till December.

Good to see that it comes to good hands. Anyhow, the BIOS already is save.