PDP-12

The PDP-12 Programmed Data Processor is a versatile digital computer which includes within its single central processor two distinct operating modes, each with its own complete instruction set. This versatility of the PDP-12 makes it, on the one hand, a laboratory-oriented machine with several built-in facilities for input/output, auxiliary storage, and control and sensing of external equipment, and, on the other hand, a general-purpose computer with a flexible input/output capability to which numerous peripheral devices may be easily attached. The central processor logic is fully parallel using a basic word length of 12 bits. The instruction cycle time is 1.6 microseconds; most instructions require from 1 to 3 cycles for execution.