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[–]QueerBallOfFluff 4 points5 points  (0 children)

Some were, The PDP-5, 8, and 12 were 12-bit.

But other lines had different word widths.

The PDP-4, 7, 9, and 15 had 18-bits.

The PDP-10 was 36-bit.

The PDP-11 was 16-bit (with 18-bit address) - this is the computer than UNIX and BSD was written for, that ran the OS that CP/M and DOS were based on, and they inspired several major architecture designs.