Alternate Power Supply for Sun 3/80:

Connector Pinouts:

3/80:

VDD +12V
VCC +5V
GND +0V
VBB -12V

Pin 6 of the Connector is for the Power-Good Signal.

PC-Clone:

Connection Path:

Connect PC Pin 5,6,7 and 8 with 3/80 3,4 and 9,10.
Connect PC Pin 3 with 3/80 5,6 and 11.
Connect PC Pin 10,11 and 12 with 3/80 1,2 and 7,8.

WARNING: This was never tested. As you can see the -12V Line is missing. The -12V are necessary for the Serial Lines.