PDP-11/45
The PDP-11/45 was the first large machine in the PDP-11 line.

Manufacturer Digital Equipment Corporation
Model PDP-11/45
Classification Minicomputer
Introduced 1972
Word Size 16 bits
Implementation TTL ICs
Registers 8 General purpose
Logical Address 16 bits
Physical Address 18 bits
Memory Type Ferrite core or semiconductor.