20eyes
New member
Testing the ram/rom board in a working board set and the game was booting somewhat playable but had vertical lines and brownish horizontal bars and 'fuzzy' garbage graphics. Replaced all sockets and had the same results.
After much probing with the logic probe I found a dead trace on the board and traced it back to U12 74LS74 pin 13 double checked the pin on my good board so I tried piggybacking a differen't chip with no change. Replaced the chip and the board is running good now.
After much probing with the logic probe I found a dead trace on the board and traced it back to U12 74LS74 pin 13 double checked the pin on my good board so I tried piggybacking a differen't chip with no change. Replaced the chip and the board is running good now.
Last edited: