The PDP-4 (Programmed Data Processor-4), which was a slower, cheaper alternative to the PDP-1, was not a commercial success. All subsequent 18-bit PDPs were based on the instruction set of the PDP-4.
Resources
PDP Timeline
PDP-1
PDP-3
PDP-5
PDP-6
PDP-7
PDP-8
PDP-9
PDP-10
PDP-11
PDP-12
PDP-14
PDP-15
PDP-16
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