This article is about the first PDP-8, which had that name without a model suffix. For information about PDP-8's in general, see PDP-8 family.
An original, transistorized PDP-8
|Word Size:||12 bits|
|Design Type:||clocked random logic|
|Clock Speed:||1.333 MHz|
|Cycle Time:||1.5 μseconds|
|Memory Speed:||1.5 μseconds|
|Physical Address Size:||32k words (requires optional Type 183 Memory Extension)|
|Virtual Address Size:||4k words|
|Memory Management:||bank select|
|Bus Architecture:||Negative I/O Bus|
The PDP-8 (now often known as a Straight 8; the name dates from the late 60's, apparently adopted to allow disambiguation), the first model of the PDP-8 family, was DEC's major breakthrough, and now considered the first really successful minicomputer. It was, by a significant amount, the cheapest computer yet made at the time.
It could perform an addition to the accumulator in 3.0 μseconds, and a 12 by 12 bit multiplication with 24 bit result in 15 μseconds (average; range 9 to 21), using the optional math extension hardware (below).
- Type 183 Memory Extension Control, bank switching needed to support more than 4K words of memory
- Type 184 4KW Memory Module (up to 7)
- Type 188 Memory Parity
- Type 182 Extended Arithmetic Element, which supported hardware integer multiplication and division, multi-bit double-word shifts, and normalization
The PDP-8 could run various operating systems including:
There are various emulators for PDP-8 systems including:
- PDP-8 - Original PDP-8 documents at Bitsavers
- Inventing Game of Life - Numberphile - PDP-8 screen running J.H. Conways game of life
|v • d • e PDP-8 Computers, Software and Peripherals|
|PDP-8s: PDP-5 • PDP-8 • LINC-8 • PDP-8/S • PDP-8/I • PDP-8/L • PDP-12 • PDP-8/E • PDP-8/F • PDP-8/M • PDP-8/A|