PDP-11/20

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PDP-11/20
Manufacturer: Digital Equipment Corporation
Bus Architecture: Unibus
PDP11/20


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...