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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.

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