TOPS-10
| Developer | Digital Equipment Corporation |
|---|---|
| Written in | MACRO-10, BLISS |
| OS family | DEC OS family |
| Working state | Discontinued |
| Latest release | 7.04 / July 1988 |
| Available in | English |
| Platforms | PDP-10 |
| Default user interface | Command line interface |
| License |
Proprietary Free for personal use |
The TOPS-10 System (Timesharing / Total Operating System-10) was a computer operating system from Digital Equipment Corporation (DEC) for the PDP-10 (or DECsystem-10) mainframe computer launched in 1967. TOPS-10 evolved from the earlier "Monitor" software for the PDP-6 and -10 computers; this was renamed to TOPS-10 in 1970.
TOPS-10 supported shared memory and allowed the development of one of the first true multiplayer computer games. The game, called DECWAR, was a text-oriented Star Trek type game. Users at terminals typed in commands and fought each other in real time.
Another groundbreaking application was called FORUM. This application was perhaps the first so-called CB Simulator that allowed users to converse with one another in what is now known as a chat room. This application showed the potential of multiuser communication and led to the development of CompuServe's chat application.
TOPS-10 had a very robust application programming interface (API) that used a mechanism called a UUO or Unimplemented User Operation. UUOs implemented operating system calls in a way that made them look like machine instructions. The Monitor Call API was very much ahead of its time, like most of the operating system, and made system programming on DECsystem-10s simple and powerful.
The TOPS-10 scheduler supported prioritized run queues, and appended a process onto a queue depending on its priority. The system also included User file and Device independence.
The first release of the PDP-6 Monitor software was in 1964. Support for the PDP-10's KA10 processor was added to the Monitor in release 2.18 in 1967. The TOPS-10 name was first used in 1970 for release 5.01. Release 6.01 (May 1974) was the first TOPS-10 to implement Virtual Memory (demand paging) enabling programs larger than physical memory to be run. From release 7.00 onwards symmetrical multiprocessing was available (as opposed to the master - slave concept used before). The final release of TOPS-10 was 7.04 in 1988.
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