Computermuseum der Fakultät Informatik

IBM 5100

CPU board

Properly it is the ALU with the resigster set. Except for the two 
28-pole ICs on top middle it is all about IBM productions. And for
the DIL-ICs you have to have list at first to find out, what's inside.
Of course, IBM also added a propreitary number to the standart-ICs.