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Revision as of 16:10, 2 July 2011
| Type | Personal Computer |
|---|---|
| Release date | 1977 (1977) |
| Introductory price | US$1295 |
| Media | 8-inch floppy disks, paper tape |
| Operating system | HT-11 |
| CPU | LSI-11 clocked at 2.5MHz |
| Memory | 32KB RAM, 8KB ROM (max) |
| Related | PDP-11 |
The Heathkit H11 Computer was an early kit-format personal computer introduced in 1977. It was essentially a Digital Equipment PDP-11 in a small form factor case, designed and powered by Heathkit. The H11 was one of the first 16-bit personal computers, at a list price of around US$1,295.
Specifications
The H11 featured:
- Processor — LSI-11 (KD11-HA half-size or "double-height" card)
- Speed — 2.5 MHz
- ROM — 8KB (max)
- RAM — 32KB (max)
- Slots — 7 Q-bus slots
- Storage — H27 8-inch floppy drive (2 256k 8-inch single sided drives) or paper tape
- I/O — serial (RS-232) or parallel ports
- Operating system — HT-11 (a simplified version of RT-11)
- Instruction set — PDP-11/40 instruction set which included over 400 instructions
- Languages — Basic, Focal and others
Initial memory limitations restricted the selection of software the system could handle, but the system could be expanded to 32KB of RAM. Many PDP-11 operating systems and programs ran without trouble. The system would also work with most DEC PDP-11 equipment, including many Q-bus compatible peripherals.
References
- 1977 advertising material from Heathkit of Benton Harbor, Michigan.
External links
- Heathkit H-11 Computer, Heathkit Computer Advertisements, Decode Systems