PDP-11/40

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The PDP-11/40, introduced in 1973, was the first machine to introduce 18-bit memory addressing on the PDP-11 platform.

The OEM version of the 11/40 is the 11/35. A special 11/40 with a blue front panel also used as the front-end for the KL-10 in Decsystem-10s and Decsystem-20s---though the 11/40 panel was hidden behind a cabinet door on the 20.


PDP-11/40
Pdp-11-40.jpg
PDP-11/40 with TU56 dual DECtape drive.
Manufacturer: Digital Equipment Corporation
Word Size: 16 bit
Physical Address Size: 18 bit
Virtual Address Size: 16 bit
Bus Architecture: UNIBUS