Fixing up first bug

A project log for PDP-11/70 replica

Recreating boards for those old computers, and improve on them

sxpertsxpert 04/04/2022 at 15:240 Comments

Turns out I was mistaken with the A=B situation.

The pins on the ALU are open collector, this does a wired AND, which is incredibly slow (as suspected).

So, what I had needs modified, and this appears to be more appropriate. The R11 / R12 value is debatable though, maybe the classic 1k value would be good enough ?