The following document was prepared by Martin-Eric Racine.
Upgrading CA401059 ST RAM cards
Late-production TT030 were delivered with this versatile ST RAM card which could be assembled as 2 or 8 MB daughterboards, thanks to its clever PCB design.The 2 MB version can be easily upgraded to 8 MB:
- Remove the old 256Kx4bit chips (TMS44C256-10).
- Install new 1Mx4bit chips (TMS44400DM-10).
- Switch the configuration headers to 8 MB.
This upgrade was prepared from various circuit schematics. While I didn't attempt it, I cannot see why it would fail. If you complete this upgrade sucessfully, please let me know.
11.01.1999:
Bernie Diotte confirms this is correct and that his upgraded daughterboard worked perfecly fine, once he remembered to switch the addressing jumpers to the 8 MB setting.
../ST RAM
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