series.

Approximately 54 were sold.

Hardware

The PDP-4 system used magnetic core memory, with memory cycle of 8 microseconds, slower than 5 microseconds of the PDP-1. However, the access time was only 2 microseconds. The system had a memory capacity between 1024 and 32768 12-bit words (i.e. the memory capacity was from 2,304 to 73,728 bytes).

The PDP-4 weighs about .

Mass storage

Both the PDP-1 and the PDP-4 were introduced

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