After some initial setbacks, we are finally making progress with the Omega MSX.

The first problem was a defective Yamaha 8139 chip, which prevented the system from booting at all. Once that was resolved, we were able to get the machine to display C-BIOS and its diagnostic screens.

That revealed a second fault: capacitor C64 was measuring only 68 µF, rather than its specified 220 µF. This was responsible for a strange yellow ghosting effect on the display.

Faulty C64 capacitor

Omega MSX diagnostics and display issue

Omega MSX repair detail

There was one further setback: while manoeuvring the RTC chip back into its socket, I completely tore off one of its pins. It is not repairable, so I have had to back-order a replacement RTC chip.

Once the replacement arrives and is installed, the Omega should be fairly complete. Then it will be time to try it with some real cartridges and/or games.