It's actually quite easy to run the 6809 Taito games from a PC's Power Supply.
These Taito games (Zookeeper, Qix, Kram, Electric Yo-Yo and Space Dungeon)
require a reset circuit (MRST) to boot the game at power on. This circuit is
actually designed to reset the game in case the power drops below a certain
voltage.

PC power supplies not only provide all the voltage the games want (+5, -5, +12,
-12), but have what's called a "Power Good" wire, which behaves in exactly the
same way as the game's original reset circuit.

I urge you to try to keep the original harness intact in case you ever want to go
back to the original supply or you want to sell the game to someone who does. The
connectors used for the power harness are common and the crimp tool to build an
adapter that will plug into the original harness is fairly cheap too.

Here's the pinouts for a PC power supply:

Pin     Function         Wire color

1.      Power Good *    Orange
2.      +5Vdc           Red
3.      +12Vdc          Yellow
4.      -12Vdc          Blue
5.      Ground          Black
6.      Ground          Black

7.      Ground          Black
8.      Ground          Black
9.      -5Vdc           White
10.     +5Vdc           Red
11.     +5Vdc           Red
12.     +5Vdc           Red

The color info is a reference. There is no strict standard for colors so the
actual colors used for your supply might be different !

Here's the pinouts of the original power connectors:

Connector "J3"
==============
      01/02|RED|+5V
03/05/07/11|BLK|Gnd.
         04|BRN|-5V
         06|YEL|+12V
         08|ORG|-12V
         09|   |n/c
         10|BLU|+12V
         12|GRN|+12V
         13|   |n/c
         14|WHT|MRST

Connector "J4"
==============
      01/02|RED|+5V
03/05/07/11|BLK|Gnd.
         04|BRN|-5V
         06|YEL|+12V
         08|   |n/c
         09|   |n/c
         10|   |n/c
         12|   |n/c
         13|   |n/c
         14|WHT|MRST

MRST is the reset circuit.

Questions and comments can be directed to me at:

tim@arcadecollecting.com