Introduced in 1969, the GRI-909 was the first system from the newly formed GRI Computer Corporation. Targetted for embedded and process control applications, the machine was very spare, with only one instruction format. The simulator is based on the 1969 preliminary reference manual, as well as a surviving program, the MIT Crystal Physics System.
Photographs (courtesy of Al Kossow):
| Option | Description | Capacity |
| CPU and memory | GRI-909 | 4KW - 32KW |
| CPU options | Extended arithmetic operator | |
| Console | S42-001 Teletype input | |
| S42-002 Teletype output | ||
| Paper tape | S42-004 High speed reader | |
| S42-006 High speed punch | ||
| Real time clock | line-time clock |
Updated 15-Sep-2003 by Bob Supnik (bob AT supnik DOT org - anti-spam encoded)
