|Williams System 11 Display Driver:
No Longer Produced
This is a replacement for the Williams display driver D-10877.
While not used in many different games, it was used in some of the
most popular, including High Speed and PinBot. Just as
in most all of the Williams display drivers, it used the obsolete High Voltage I.C.s to drive the 90V fluorescent displays. The
UDN7180 and UDN6184 are both obsolete and very difficult to find.
Once a replacement is found, there is a good chance that it will
not last long, since it is probably already 20 years old.
This board replaces the obsolete High voltage IC devices with
discrete components rated at 300V and higher to be sure it can
easily handle the 90V needed for the displays. All of the
components are readily available and are ordered new for the
production of this board to be sure it will be usable for another
20 years. Additionally, all the I.C.'s used are mounted using
machined pin sockets, for reliable connection, yet easy
replacement and trouble shooting. Using discrete drivers for
the displays requires more devices, as can be seen, however, if
one ever fails, it only requires replacing a single transistor,
instead of a whole IC.
The Player 5 and Player 6 connectors were removed from the
original as well as the holes for the 26 pin connectors for
Players 3 and Player 4, since they are not used for any games,
except for some shuffle bowlers. The board is a direct
replacement for the following games:
Each board comes complete with the replacement board,
schematics, board layout drawings, and instructions.
Need Cables? I also have the 20 pin and 26 ribbon cables
available. Click HERE for
old Williams System 11 D-10877 display driver board:
Kohout Enterprises System 11 HS Display Driver:
Display Driver mounted in High Speed Backbox with cables removed
Display board mounted in High Speed Backbox with
Operating in my MINT High Speed machine: