Short update.
Two ICs were bad. Replacing these two, the A13 board passed a simple integrity test of writing 0xAA and 0x55 to each position.
Next step is to create a bin file from Wayne's 5.14 zip file, that covers the complete memory space.
On a side note. TL866 claims to write Xicor x28256, but doesn't seem to disable write protect in the correct way. Scavenged chips could not be written there, but seem to work on the A13 board.
Regards,
? Staffan
