Bench setup for the System 80 test EPROM

Steps

• Make sure any battery damage has been properly repaired first.
• Connect an LED with a 1K series resistor between +5 V and address line A6 at 6502 pin 15 (clip on or tack solder). A piggyback with its own A6 LED needs no extra LED.
• Power the board from a single +5 V bench supply able to give at least 1 to 1.3 A, with the current limit set below 2 A so a short cannot burn traces.
• At power-on ignore the first short flash; the test sequence follows.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• System 80 test EPROM LED flash codes
• Which System 80 CPU board goes with which games
• Replacing U2 and U3 with one 2764 EPROM
• System 80 DIP switches 25 to 32
• Ways to fit EPROMs at U2/U3
• System 80 DIP switches 17 to 24: game play
• System 80 CPU board main chips
• Testing the DIP switch inputs with the test EPROM

Source: Gottlieb System 80 Test EPROM V3.2 (February 2015), Pinitech