2023-02-04

Populated with PAL chips. Both memory chips have A0 to 13, enough for 16K devices. Address, Data, /CE, /RD and /WR pins are toggling.

No sign-on message. :-(

Serial data from terminal appears at the CPU pin RXA0, and CTS0 toggles as driven by RTS, but no activity on TXD0.

There is a good chance that this was a non-working board used for exhibition display purposes.

This will take a bit of work to diagnose. I'll need to analyse the firmware. I started disassembling it. I need to write some self-diagnostic code.