Running Z80 CP/M at just over 18Mhz

January 11, 2021 Dan Hevey

No, there’s no CP/M card in this IIe. It’s all being done through the little SC131 CP/M box. It has a Z180 processor and has 2 high speed serial ports. I’m actually attaching to it through a Raspberry Pi, but it feels like it’s running locally. By …


Doing some work on the non-gate array model 4

January 9, 2021 Dan Hevey

Sometimes the video would shrink & grow after the machine’s heated up, like there’s a loose connection, or maybe a bad solder joint. After some checking, solder joints seem solid. Seems to have been the connector on the ribbon connecting the video board to the PS and main board. The …