The PDP-5 (Programmed Data Processor-5) was DEC's first 12-bit machine. It introduced the instruction set that was later used in the PDP-8. Instead of having a dedicated hardware register, the memory location at address zero was used as the program counter.
Resources
PDP Timeline
PDP-1
PDP-3
PDP-4
PDP-6
PDP-7
PDP-8
PDP-9
PDP-10
PDP-11
PDP-12
PDP-14
PDP-15
PDP-16
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