Newbrain memory replacement

[CDesp]

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I am planning to replace the Memory Board of one of my machines with a new design that uses a 32Kb Static Ram instead of all the 4116 DRam chips the original is using.

All the signals of the old board are replicated. I am using the RAS and CAS signals to set the signals of the 62256 Static Ram Chip.

I ll test this at home using a cpld for the 74ls ics and if everything is ok i’ll send the PCB for fabrication.

If someone knows a good replacement for the paper flatwires please let me know. I ordered several KF2510 male and female connectors for this purpose.

Schematics

 

New Board 3D

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