Fitting the original sound board PROM

The sound PROM (U4) is marked with the game number and goes in with its notch facing up on the board as drawn. The socket is 18-pin.

Systems

• Gottlieb System 80

Related tips

• How the original System 80 sound board makes sound
• The original sound board self-test only works with S1 and S2 set opposite
• Supplies on the original System 80 sound board
• Fault-finding the original System 80 sound board
• No sound at all
• Distorted sound
• The wrong sounds or tunes play
• Original sound board connector A6-J1

Source: System 80 Service Manual, Gottlieb