|Replacement System 3-7 Main Board:
no longer produced
This is a drop in replacement for all Williams System 3 to 7
pinball and shuffle bowler games. Like all the other Kohout
Enterprises' boards, obsolete components have been designed out,
when possible, and up to date devices are used. The
board includes a 30 day unconditional guarantee and a 1 year repair/replacement
Some Improvements to the original are as follows:
No Battery Backup required - Preferred option uses Ramtron
FerroRAM which does not require a battery to save data.
Click for Datasheet and
see below for more technical details.
Added 40-pin connector for Replacement Main Driver Board - A
standard 40-pin IDE connector has been added to bypass the large,
problematic molex connector.
Simple Diagnostic LED's added for troubleshooting - 9 LED's were
added to check the critical signals on the board to be able to
troubleshoot simple problems with the board.
Simple jumpers to allow many different configurations of EEPROMs -
2532 or 2732 EEPROMs can be used and Williams supplied Firepower
EEPROM code requires only a jumper change
Clearly labeled Jumper Setting and components are silk screened on
the board for easy identification.
Difficult to find IC's have been designed out and replaced with
components that are currently available from multiple sources.
Thicker PCB for improved durability - 0.093" instead of 0.063"
Each board comes complete with the replacement board, schematics,
board layout drawings, instructions, and one EEPROM set to
the game of your choice.
This board will work in the following games:
System 3: Contact, Disco Fever, Hot Tip, Lucky Seven,
and World Cup
System 4: Flash, Pheonix, Pokerino, and Stellar Wars
System 6: Blackout, Firepower, Gorgar, Laser Ball,
Scorpion, Time Warp, Tri Zone, Algar, Alien Poker
System 7: Black Knight, Barracora, Cosmic Gunfight,
Defender, Firepower II, Hyperball, Joust, Jungle Lord, Laser Cue,
Pharaoh, Solar Fire, Star Light, Time Fantasy, and Warlok
Shuffle Alleys: Topaz, Taurus, Pompeii, Aristocrat,
King Tut, Omni, Big Strike, and Triple Strike
Kohout Enterprises System 3-7 Replacement board (Click Picture for Larger
Kohout Enterprises System 3-7 Battery Connection (Optional Battery
backup), Diagnostic LEDs, and Jumpers and Jumper Setting Table
(Click on picture for larger view) :
Main System 3-7 Board mounted in Backbox and operating
(Click on Picture for larger view):
Replacement System 3-7 Board uses a 0.094" think board instead of
the original 0.063", which makes it much for rigid.
The two 2114 RAM chips have been designed out and use a single
6264 RAM. The 5101 battery back up RAM, now has five options
on the replacement board:
ST ZeroPower SRAM (Datasheet)
Dallas NonVolatile SRAM (Datasheet)
- Both have built in Lithium Battery
Ramtron FerroRAM - No Battery Required -
External Battery Backup Low Power 6264
External Battery Backup Low Power 5101
- No Battery Required - Datasheet
For the external battery backup options, a two position terminal
block has been added for easy connection to an external battery
Several of critical signals were buffered and used to drive LEDs
to for simple diagnostics purposes.
VCC OK - Indicates that the 5V supply is above 4V
VDC12 OK - Indicates that the 12V Supply is above 8V
nRESET - Indicates that the Reset circuit is working
Blanking - Indicates if the blanking signal is correct.
BUS02 - Indicates the clock is running
nIRQ - Indicates the IRQ circuit is running
MemoryProtect - Indication for the Memory protect switch on the
Advance Input - Indication for the Advance switch on the coin
Auto/Manual Input - Indication of the Auto/Manual switch on the
For system 7 Games, the board can be configured to work with a
2532 or 2732 EEPROM for IC17.
For Firepower, the board can be configured for a 2732 Combo
ROM, as posted on the Williams Webpage.