Pre-WPC-S CPU EPROM size jumpers W1 and W2

On A-12742 CPU boards, W1 and W2 are beside U6 (the game ROM), on its right. For a 1 Mbit 27010 ROM set W1 out and W2 in; for a 2 Mbit 27020 or 4 Mbit 27040 set W1 in and W2 out. Changing them means soldering. This matters mostly on early Funhouse, Harley Davidson and Bride of Pinbot boards when upgrading ROMs or moving a board to a later game.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS

Games

• Funhouse
• Harley Davidson
• The Machine: Bride of Pinbot

Related tips

• CPU board from an early game won't boot: ROM jumper W1
• Country jumpers W13 to W18 on pre-WPC-S CPU boards
• What is on the WPC CPU board
• What fails on a WPC CPU board
• Running a WPC CPU board on the bench
• Bench-check the WPC CPU switch matrix circuit
• Which System 11 CPU boards fit which games
• What the WPC custom chip does

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part One, Clay Harrell (pinrepair.com)