From: William Levak (wlevak_at_cyberspace.org)
Date: 2004-01-16 06:23:11
Looking at the schematics, it appears that the 5V line is not needed at
all. The joystick contacts connect their respective lines to ground. It
should be safe to connect the grounds together, especially if both
computers are connected to the same outlet. The 5V is only TTL
level 5V. Connecting the 5V levels of two computers together might
still be a problem. A 10K resistor on each line between the two computers
should be enough to limit current flow for the slight mismatch in the 5V
levels of the two computers, while still alowing them to be pulled close
enough to ground to register as a TTL level change.
The two pot lines are connected to the SID chip. Connecting those
together may not produce anything usefull.
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