New redesigned board for Williams System 9, 11, 11A, 11B, 11C MPU and Driver Board with integrated audio circuitry.
Replaces original part numbers:
Board is plug-and-play compatible with the original board set. No special tools or mounting tricks are required and the swap can be done by even the most novice of "installers".
Benefits over the original Williams board:
Williams WPC type mounting holes for ease of install / uninstall
No batteries required for memory retention - no acid damage, ever!
Simplified driver design using logic level FETs
Beefed up switch matrix drive for better durability (good to 100V back drive)
Board is made with 100% through hole components
No custom parts used in this design (all parts can be purchased through usual suppliers)
Major component designators carried over from original design so original schematics can be used
Board comes with complete set of schematics
In order to keep the price of this board as low as possible, the baseline price does NOT include the microprocessor (6802 nor 6808) the game/sound ROMs as all are socketed on the original board and can be moved to our new board fairly easily. We do offer the board with optional game ROMs, see below.
Installation notes for system 9 and 11 pins: You do not need to change jumpers W8 and W9 to differentiate between System 9 and System 11. Both run with a jumper on W9.
Installation notes for System 9 pins:
The original game/sound ROMs (U27, U21 & U22) can NOT be transferred to the MPU9211. New custom game and sound roms must be installed. We have these ROMs optionally available for Space Shuttle, Comet & Sorcerer. (See below)
The board is mounted upside down (as per the original). The mounting holes appear odd, but will work.