This type RAM expansion you have?
I suggest find a HY53C256 RAM ICs, these use less power, because these are CMOS ICs.
At here you can find some dutch magazines. Do you have more?
Yes, thats it!
I will look for these type of RAM. How many can I use in combination with this board?
I have some more.
I will try to scan these and upload.
I bought it as a 64K version.The expension was done later by the dutch user club, but probably it was sent to Germany.
Very interesting the your EXDOS label, the serial number part are missing! You bought it with this label? Or it is repaired once?
HAve you seen such a drive combo before?