Model 200 RAM
- (1) TC551001 128kB SRAM
- (1) 74AHC1G08 AND gate
- (1) 0805 1uF ceramic cap
- (29) round pins
The ram in the DigiKey cart above is not yet tested and verified to be a working drop-in replacement for the original specified ram.
This is enough parts to build 3 boards, because you can't order less than 3 PCBs from OSHPark anyway. But you only need 1 board total per Model 200. The single new board takes the place of both ram sockets. You can reduce the parts quantities in the DigiKey order.
There will be a few unused pins left over. The order is for 3 sticks of 32 pins each. You will break away and use 14 + 14 + 1 pins from 1 stick for each ram module.