Quick repair this one.
Received this board recently from a great eBay seller.
It was sold as faulty and indeed it was. On power up I was greeted with this static screen.
As the Z80 is already socketed on these boards I hooked the Fluke 9010 straight up and did a RAM test. As I was expecting, this failed.
The main RAM is located next to the 4 program ROM’s. One socket and one new RAM chip and we have a nice easy fix.