From: "Will Jennings"
How the hell do you tell if the thing is negative or positive bus? I need to
know this before I go and buy some peripherals...
If the lower rows have M650/M651 then it is negative bus. I'm sure your's
is positive bus so you won't be going after the stuff I want :-).
-- Run an old computer with blinkenlights.
Have any PDP-8 stuff you're willing to part with?