Aug 202018
 

Got on the bench some days ago this Twin Hawk PCB (another board coming from Portugal)

Board booted up and game was playable but with bad graphics :

All the GFX data are stored in four 4Mbit MASK ROMs:

I dumped them in my programmer and the ones @3K and 3J resulted empty :

As proof of this I loaded the dumps into MAME and I was abble to reproduce exactly the same issue :

I replaced the two faulty MASK ROMs with 27c400 EPROM devices

This fixed graphics and board completely.

 Posted by at 4:38 pm