As i promised, i wanted to let you know if SukkoPerra's A600 4MB fastram expansion works. I solderd the ramexpansion today and yeeeeah ...it's working
The only thing what is not so great is the PLCC68 socket, without screw it'll jump out from the CPU after max. 10 minutes !...i'll have to find a screw now and hope it'll keep holding with only one screw. Maybe an other socket will hold the ramexpansion better, but i don't think so...all those socket are looking very similar.
Ah, and i've tested it with a Rev.1 board. It also has the resistor on the corner, so you've to cut out a little bit from the PLCC68 socket. See pictures below.
If someone wants to use a plastic spacer for the screw between board and ramexpansion, it should be 8.7 mm high
