Installing a single-EPROM adapter in the CPU socket

Steps

• Use anti-static precautions: the 5101 RAM at IC19 and the EPROM are easily damaged.
• Gently lever out every ROM in IC14, IC17, IC20, IC21, IC22 and IC26 with a thin flat tool from both ends, lifting the chip and not the socket. An unmodified Firepower has all six; other games and combo-ROM Firepowers have three.
• Lever out the 6808/6802 CPU at IC1.
• Fit the CPU into the adapter's 40-pin socket, notch matched to notch, all pins aligned.
• Press the adapter into the IC1 socket, CPU end to the left and LEDs at the bottom. The IC1 socket must be good: replace an original Scanbe or RN socket with a quality double-wipe or machined-pin socket first.

Systems

• Williams System 6 / 6A

Games

• Firepower

Related tips

• What changed on the System 6A CPU board
• Firepower CPU ROM configuration and jumpers
• Reading the software ID in audit 00
• Set System 6 jumpers J3/J4 for a single game EPROM at IC14
• CPU locked: check the EPROM chip select
• Leon code running but LEDs dark: bad CPU PIA IC18
• Replacing the 6802 CPU with a 6808
• Identifying a System 3 to 7 CPU board

Source: Williams pinball EPROM adapter instructions, Siegecraft