Swapping CPU boards between System 80, 80A and 80B
An 80A CPU board works in a System 80 game only after U2/U3 are changed, and the reverse is also true. An 80B board runs only 80B games: it has no U2/U3 (that code moved into the game EPROMs) and its display logic is changed for alphanumeric displays.
Systems
Related tips
- System 80 and 80A CPU boards swap only with the matching U2/U3
- Which System 80 CPU board goes with which games
- Making a System 80B CPU board run an earlier game (or the reverse)
- Big House and later use the MA-1133 System 80B CPU board
- System 80 CPU board main chips
- Reading the System 80 CPU DIP switches
- U2/U3 rules ROMs decide which system a CPU board runs
- System 80 CPU board revisions D102, D107 and D20869
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)