Originally Posted by hap
The game gets stuck in a call-loop rightaway, so programcounter order is probably still wrong. Opcode bit-order looks correct though.

In case you compile the latest MAME for testing, you'll need the PLA files: http://tsk-tsk.net/net/temp/copycatm2.zip
I haven't built from source for a while; I'll have to install the new toolset. I did change the page order from 0123456776543210 to 0123456701234567 and things look a little better. I updated the ROM file on my page.