Difference between revisions of "PDP-8/E"

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(better image, +img of 8/F)
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[[Image:PDP-8'F SimonClaessen.jpg|left|thumb|400px|PDP-8/F at Hack42 in Arnhem, The Netherlands]]
[[Image:PDP-8'F_SimonClaessen.jpg|400px|PDP-8/F at Hack42 in Arnhem, The Netherlands]]
[[Image:PDP-8'M_BrianStuart.jpg|400px|PDP-8/M from Brian Stuart's collection]]
==External links==
==External links==
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* [https://ethw.org/First-Hand:PDP-8/E_OMNIBUS_Ride First-Hand:PDP-8/E OMNIBUS Ride] - PDP-8/E Design Story
* [https://ethw.org/First-Hand:PDP-8/E_OMNIBUS_Ride First-Hand:PDP-8/E OMNIBUS Ride] - PDP-8/E Design Story
* [https://hack42.nl/wiki/Digital_PDP-8f Digital PDP-8F]
* [https://hack42.nl/wiki/Digital_PDP-8f Digital PDP-8F]
* [https://www.cs.drexel.edu/~bls96/museum/pdp8.html PDP-8/M Restoration Project]
{{Nav PDP-8}}
{{Nav PDP-8}}
[[Category: PDP-8s]]
[[Category: PDP-8s]]

Revision as of 16:25, 9 January 2021

PDP-8'E FlorianSchäffer.jpg
PDP-8/E front panel
Manufacturer: DEC
Architecture: PDP-8
Year Introduced: 1970
Form Factor: minicomputer
Word Size: 12
Logic Type: TTL
Design Type: clocked random logic
Clock Speed: 385KHz
Memory Speed: 1.2 μseconds
Physical Address Size: 32KW (requires optional KM8-E)
Virtual Address Size: 4KW
Memory Management: bank selection, CPU mode
Bus Architecture: OMNIBUS
Operating System: OS/8, TSS/8
Predecessor(s): PDP-8/I
Successor(s): PDP-8/A
Price: US$5K (CPU and 4KW memory)

The PDP-8/E was an improved model in the PDP-8 line, and introduced the OMNIBUS for interfacing to device controllers.

The PDP-8/F was a cost-reduced version of the -8/E with the same CPU and core main memory, but only a single OMNIBUS backplane. The PDP-8/M is the OEM version of the PDP-8/F.

The -8/E's KK8-E CPU consists of five quad boards; the MM8-E core memory that was standard on the -8/E consisted of sets of three quad boards.

Options included:

  • KA8-E Positive I/O Bus Interface, to allow use of older PDP-8 devices
  • KM8-E Memory Extension and Time-Share Option, which was needed to support more than 4K words of memory, and allowed the computer to operate in either Executive Mode or User Mode
  • MP8-E Memory Parity
  • KD8-E Data Break Interface
  • KE8-E Extended Arithmetic Element, which supported hardware integer multiplication and division, one-bit double-word shifts, and normalization
  • FPP12-P and FPP12-AP Floating Point Processor (24+12 bits)
  • FPP12-AE Double Precision option (FPP12-AP only, 60+12 bits)

It could perform an addition to the accumulator in 2.6 μseconds, and a 12 by 12 bit multiplication with 24 bit result in 40 μseconds, using the math extension hardware.

The -8/M could be supplied with either a KC8-M Operator's Console, or a KC8-ML Programmer's Console, the latter being basically identical to the KC8-EA Programmer's Console of the basic -8/E.


PDP-8/F at Hack42 in Arnhem, The Netherlands

PDP-8/M from Brian Stuart's collection

External links