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Olivetti M300-02F/PCS33 25MHz BIOS

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First post, by RandomBlankUsername

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Hello (again) 😀

I'm currently looking for said BIOS as I'm looking forward to upgrade my 16MHz M300-02 to 25MHz (already ordered a 25MHz CPU, as I didn't want to push the little SX16 that far as it already gets quite hot with 20MHz). Sadly it hasn't been uploaded to TheRetroWeb yet (V1.02 was submited by me), nor did any youtubers showing off their hardware respond or do so on their own 🙁
Version numbers should be 5.0x (M300-02) or 6.0x (PCS33).
Thanks in advance.

Reply 1 of 5, by Susanin79

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Hi, here is the BIOS dump from my machine. I didn't restore it yet and even didn't boot. Hope this will help

Reply 2 of 5, by RandomBlankUsername

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Thank you very, very much! I'll give it a spin as soon as possible. Feel free to give me a ring if you have issues with getting the machine running - mine didn't boot at first either (oxidized leads on the RTC crystal).

Reply 3 of 5, by RandomBlankUsername

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Dump confirmed working (on my 16MHz machine for now) 😀
Did you send it to TheRetroWeb as well? Otherwise I'll do so for completeness sake.

Reply 4 of 5, by Susanin79

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RandomBlankUsername wrote on 2025-12-01, 12:12:

Dump confirmed working (on my 16MHz machine for now) 😀
Did you send it to TheRetroWeb as well? Otherwise I'll do so for completeness sake.

Yes, send it please. Glad to know that this BIOS is working good.

Reply 5 of 5, by RandomBlankUsername

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Done 😀

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