Putting all CPU ROMs in one 2764 so any board fits any game
The game ROM (IC14) and the two flipper ROMs (IC17 and IC20) can be programmed into a single 2764 EPROM: the IC14 image (or the Firepower combo image) at address 0000, IC20 at 1000 and IC17 at 1800. With a small rewire this lets a System 3, 4 or 6 CPU board run any game of the series, such as a System 3 board in Firepower. The current IC14 game ROM images combine the old IC21, IC22 and IC26 chips; on Firepower, which already had an IC14, the combined chip is called the combo ROM.
Systems
Related tips
- System 3 CPU board ROM layout
- System 4 CPU board changes and ROM layout
- System 6 CPU board changes and ROM layout
- Firepower CPU ROM configuration and jumpers
- Fitting the combined 2764 to a System 6 CPU board
- LEDs flicker then stay on: flipper or game ROM problem
- Identifying a System 3 to 7 CPU board
- What changed on the System 6A CPU board
Source: Use any Williams 3/4 or type 6 board for any pinball from this series (2764 EPROM remapping)