The PDP-11 was an extremely successful and influential family of machines which has spanned over two decades from the early 1970s through the mid-1990s. The first PDP-11 in 1970 cost $10,800 and was DEC's first and only 16 bit computer.

The 11/04 (September 1975) was an implementation of the Unibus PDP-11 architecture, and was essentially a replacement for the 11/05 & 11/10. It was the first PDP-11 to escape without a 'proper' lights & switches front panel, instead it had the glorified 'programmers console' as an option - a hex keypad and an LED display which showed address/data digitally.

It came in two chassis, like the 11/05 & 11/10 - a half-height example, which had the entire Unibus backplane, power supply, front panel - basically the whole computer - sliding into an evil jamming finger-trapping metal sleeve - and a full-height example, basically the same BA11 box as used by the 11/35 and many many other DEC applications. It is very similar to its higher-spec twin, the 11/34. Our model is the half height one.

The PDP 11/04 is a Unibus based 16-bit minicomputer which included the following boards:
M7263 KD11-D 11/04 processor module
M7847-DJ MS11-JP 16-Kword 18-bit RAM
M9312 Bootstrap terminator with 5 empty ROM sockets
M7859 KY11-LB Console interface; programmer's console
M7856 DL11-W RS-232 SLU & realtime clock option
G7273 Bus Grant & Non-processor grant
M8256 RX211 RX02 floppy disk controller

Our model PDP 11/04 BD has a serial number of AB 07040 as well as AB 07033 dated 22nd September 1978.

Our machine was very kindly donated by John Millar and is in an unused condition.

Manufacturer: Digital
Date: July 1976

This exhibit has a reference ID of CH30094. Please quote this reference ID in any communication with the Centre for Computing History.