I can only boot to BASIC without the 1Mbit cartridge.
Without the cartridge the computer behavious normally and outputs 37902 (fre) and 160 (peek 5)
With 1MBit cartridge the memory is less, boots directly to SELF TEST and the testcart RAM test gives errors.
With 8Mbit cartridge the computer doesn't see it at all.
With MyIDE+Flash, computer starts up with scrambled screen. testcart RAM test is OK
MMU has changed replaced by another CO61618 (from an 800XL Freddy)
No results.
I have checked the cartridge port and all the pins are connected.
None bend.
So that probably means I have to replace RAM.
Could such a problem easily be comming from a broken condensator, or resistor?
Or should I just use this board without cartridges?
Again thanks for your help Steve!!