C103088 Rev.2.A

[Marsupilami]

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Ram is a bit strange...I don't know how to upgrade it...

[Petari]

That's 1MB RAM with 1 bit chips. Both banks filled. So, for upgrade you need to remove 1 (then to 2.5 MB), or both - (4 MB) existing banks. That may be problem for sure. Possible to leave them in, just connect chip select, output enable lines to +5V . And adding expansion then. Will it be OK or not depends - even inactive chips pull some power and load lines. Or maybe just get an STE

[Marsupilami]

Yes you're right, i have a STE and a MegaST already but i like to do some improvment on theses good old Ataris...

Upgrading RAM will we hard indeed so i will let it "as is".

Here my main problem is to upgrade TOS (in French) to make it work with my ultrasatan+PPDrivers (it doesn't work on all my french STF with TOS 1.2)
I'm not sure a TOS upgrade will solve the problem anyway.

[sandord]

Just reposting a copy of the main board image here because OP posted a link to an external site, which are prone to going offline/break after time.

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[exxos]

Just reposting a copy of the main board image here because OP posted a link to an external site, which are prone to going offline/break after time.

Thanks, I've uploaded all the images. We are actually talking about this type of "problem" in the moderator forum as well