FigTronix
Model 100 Main ROM 27C256 PLCC Adapter
This is ONLY for early Model 100's that had a weird main rom pinout, with chip number LH535618.
Late Model 100's and all Model 102's had a standard 27C256 pinout and don't need any adapter.
About the parts order:
- It includes enough parts to build 3 boards, because you can't get less than 3 PCBs from OSHPark. If you want to build just one board, reduce the quantities by 2/3.
- It includes several extra 27C256 eprom chips, because they are one-time-programmable, not erasable. I just picked 10 as a generous round number. You can order as few as one chip per board, if you know you will get the programming step right the first time.
- Or, if you can find some uv-erasable ones, you can use just one of those, and delete the eproms from the DigiKey order. You can't get new uv-erasable 27C256 in plcc packaging today, but you can possibly find old stock or used ones. Like these: