tendril
Well-known member
So unfortunately this suggests one of the customs has gone bad. The graphics are 4 bits per pixel and each custom handles 2 bits (each ROM supplies 1 bit which is why they are in sets of 4).
Because the colors changed when the customs were swapped different bits must be getting through. If both customs worked then there would have been no chance after swapping them.
So to verify - swap the customs back again - is the original 'brown' look back? Any broken legs on the chips? Or dirt/corrosion in the socket?
To check the ROMs dump them and compare the checksums to the MAME ROM set. However they are probably good as per the logic above.
Because the colors changed when the customs were swapped different bits must be getting through. If both customs worked then there would have been no chance after swapping them.
So to verify - swap the customs back again - is the original 'brown' look back? Any broken legs on the chips? Or dirt/corrosion in the socket?
To check the ROMs dump them and compare the checksums to the MAME ROM set. However they are probably good as per the logic above.
