One problem with this project is the power supply. Konami was on the Switching Power Supply band wagon early. This 1981has a switcher, not the usual linear power supply.

It is also a Z80 based game so this switcher has +5 VDC but nothing more. The 8080 based games of the era needed +5, -5 and +12 to operate.

Competitive advantage for the Z80, but not a common power supply for me 30 years later. It was reading 2.3 VDC instead of +5. Not enough to start the board. We swapped in a standard switcher and the board started up!

A second problem with this project is the monitor. The vertical mount Wells Gardner 4600 is curling over and weak on colors. Time for a cap kit.

We hooked up a recently rebuilt G07 and the game worked perfectly.

The replacement power supply is in place and screwed down. We need to pull the monitor and recap next.