|Introductory price||US$1295 (equivalent to $4,755 in 2016) (kit)|
|Media||optional 8-inch floppy disks, optional paper tape|
|Operating system||optional HT-11|
|CPU||LSI-11 clocked at 2.5MHz|
|Memory||4kword base system, maximum optional 32kword RAM, 8kword ROM (2 bytes/word)|
The Heathkit H11 Computer was an early kit-format personal computer introduced in 1978. It was essentially a Digital Equipment PDP-11 in a small-form-factor case, designed by Heathkit. The H11 was one of the first 16-bit personal computers, at a list price of US$1,295, but was too expensive for most Heathkit customers and was discontinued in 1982.
The H11 featured:
- Processor — LSI-11 (KD11-HA half-size or "double-height" card)
- Speed — 2.5 MHz
- ROM — 8Kwords (16 Kbytes) (max)
- RAM — 32Kwords (64 Kbytes) (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
- Languages — BASIC, Focal and others
Initial memory limitations restricted the selection of software the system could handle, but the system could be expanded to 32KW x 16-bit 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.
- Federal Reserve Bank of Minneapolis Community Development Project. "Consumer Price Index (estimate) 1800–". Federal Reserve Bank of Minneapolis. Retrieved January 2, 2017.
- Heathkit 1978 catalog pages retrieved 2011 July 11
- Wise, Deborah (1982-09-13). "Heath joins Zenith to attract hobbyists, businesses". InfoWorld. p. 19. Retrieved 8 January 2015.
- 1977 advertising material from Heathkit of Benton Harbor, Michigan.
- Heathkit H-11 Computer, Heathkit Computer Advertisements, Decode Systems
- Computer Museum illustration of fully expanded H11 with the Heath/Zenith label.