DECSYSTEM-20
DECSYSTEM-20 KL-10 (1974) at the Living Computer Museum | |
| Also known as | PDP-20 |
|---|---|
| Developer | Digital Equipment Corporation |
| Product family | Programmed Data Processor |
| Type | Mainframe computer |
| Release date | 1977 |
| Operating system | TOPS-20 |
| Platform | DEC 36-bit |
| Related | PDP-10 |
The DECSYSTEM-20 was a family of 36-bit Digital Equipment Corporation PDP-10 mainframe computers running the TOPS-20 operating system and was introduced in 1977.
PDP-10 computers running the TOPS-10 operating system were labeled DECsystem-10 as a way of differentiating them from the PDP-11. Later on, those systems running TOPS-20 (on the KL10 PDP-10 processors) were labeled DECSYSTEM-20 (the block capitals being the result of a lawsuit brought against DEC by Singer, which made its own System Ten model, occasionally referenced in reporting as the "System 10"). The DECSYSTEM-20 was sometimes called PDP-20, although this designation was never used by DEC.