Memory Expansion Board is almost done – I’m short one 7442, which will prevent me from checking out the last slot, but otherwise it’s ready to go. This board went pretty quick, the 67 resistors took as long as anything else on this board.

Memory Expansion Board

For now, I’m hacking together a wooden chassis with sheet metal front and rear panels. Once I get the aluminum version figured out, It will be easy to move the backplane and front panel switches from this hack job to the final chassis.

Temporary Wood Chassis

As far as the possibility of the short on the 4K SRAM board, though it’s pretty remote, I decided to add some masking tape to the bottom of one end of the fuse holder to eliminate it entirely.

Fuse Holder Masking Tape

Given where I’m at at this moment, I expect I’ll be able to power up the 8B with 4K of SRAM within a week.