Fitting the 2532 test EPROM at U3 on a board without a piggyback

Steps

• On a System 80 board, desolder masked ROM U3 and fit a good socket. 80A boards usually already have one.
• Bend pin 20 of the 2532 test EPROM up so it stays out of the socket, then plug it into U3.
• Run a wire from that bent pin 20 to address line /A13 at Z7 (7404) pin 12.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• How a 2332 rules ROM differs from a 2532 EPROM
• Replacing U2 and U3 with one 2764 EPROM
• Ways to fit EPROMs at U2/U3
• Which System 80 test EPROM image to use
• Testing the DIP switch inputs with the test EPROM
• A System 80 board boots without its 5101 RAM
• Test EPROM stalls at the switch matrix RIOT (U4)
• Test EPROM 2: game PROM socket test fails

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