Interactive Application System
| Developer | Digital Equipment Corporation |
|---|---|
| OS family | RSX-11 |
| Working state | Discontinued |
| Initial release | 1975 |
| Latest release | 3.4 / May 1990 |
| Available in | English |
| Platforms | PDP-11 |
| Influenced by | RSX-11D |
| Default user interface | PDS or MCR Command-line interface |
| License | Proprietary |
Interactive Application System (IAS) was a DEC operating system for the PDP-11. It was a fork from RSX-11D.
The last major release, Version 3.0, began distribution late 1979; the final version, 3.4, came out May 1990.