Fortunatly I found that Vince Briel had released the assembler source for the Atmel ATMEGA chips to run the display and keyboard. I thought that finding the ATMEGA chips here in Denmark would be the greatest challenge, but hopefully yesterday I found a supplier, KOZ Electronics.
I might have been very naiv thinking, that if I could just find the components, everything would be fine. Afterall the computer would use standard composite signal.
Argh ... a composite signal is just not a composite signal. There's a NTSC signal and a PAL signal. I assume the Replica I will produce a NTSC signal.
Is there any way to change the firmware in the ATMEGA8 so it will send a PAL signal instead?