schematics : how the chips are connected together

the guts of an ICM816 calculator, where the 6 white ceramic chips can bee seem under the 9 Nixie tubes above.

The "set" :
The input chip 100
The program control chip 200
The register chip 300
The arithmetic switch 400
The output chip 500
=> microcoded machine.
patents.google.com/patent/US380...
#calculator #ICM816 #microcode #architecture