PDP-11/20

From Computer History Wiki

PDP-11/20
Manufacturer:	Digital Equipment Corporation
Bus Architecture:	Unibus

The PDP11/20 was the first PDP-11 to run Unix. Another thing that is interesting is that a coprocessor was required for the multiply/divide instructions, making this model incompatible from the rest of the PDP-11's.

More information is available on the PDP-11 page...