Ever seen an STFM memory upgrade like this before?

[VonIII]

STFM.jpg (382.4 KiB) Viewed 185 times

I have this mostly working STFM here with these 30 pin simm sockets floating under the keyboard. I threw two 256K simms in there to see if it would go to 1MB, but no dice.

Has anyone seen a mod like this before, and should it work?

SYSINFO.jpg (392.12 KiB) Viewed 185 times

[rubber_jonnie]

Yes, they pop up from time to time and it should work.

[stephen_usher]

It may need 1MB SIMMs.

[VonIII]

It may need 1MB SIMMs.

Thanks for the feedback all. I'll try some 1MB SIMMs. I've heard the bios will simply "ignore" memory it doesn't like, is there any flavor of memory that these machines prefer or are proven to work with?

[VonIII]

I found this diagram which is helpful, and tracing each connection i've already found some issues, like A1 & A5 are transposed on the right-hand SIMM. I'll keep checking. If I do get it working i'm going to consider re-doing the whole job a bit cleaner.

SIMMUpg.JPG (82.79 KiB) Viewed 104 times

[VonIII]

Fixed the wiring and found a set of SIMMs the STFM likes

SIMMGood.JPG (206.56 KiB) Viewed 74 times

Now I can play some games after the HD driver loads =)

AtariST2.5M.JPG (333.73 KiB) Viewed 74 times