Heathkit H11
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The Heathkit H11 Computer is an early kit-format personal computer introduced in 1978. It is essentially a Digital Equipment PDP-11 in a small-form-factor case, designed by Heathkit. The H11 is one of the first 16-bit personal computers, at a list price of US$1,295,[1] (Expression error: Unrecognized punctuation character "[".) but it also requires at least a computer terminal and some form of storage to make it useful. It was too expensive for most Heathkit customers, and was discontinued in 1982.[2]
Specifications
The H11 featured:[3]
- Processor — LSI-11 (KD11-HA half-size or "double-height" card)
- Speed — 2.5 MHz
- ROM — 8 kWords (16 KB) (max)
- RAM — 32 kWords (64 KB) (max)
- Slots — 7 Q-bus slots
- Storage — H27 8-inch floppy drive (2 256 KB 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 restrict the selection of system software, but the system RAM can be expanded to 32 kWords * 16 bit. Many PDP-11 operating systems and programs run without trouble. The system will also work with most DEC PDP-11 equipment, including many Q-bus compatible peripherals.
See also
References
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- ↑ 1977 advertising material from Heathkit of Benton Harbor, Michigan.
Script error: No such module "Check for unknown parameters".
External links
- Heathkit H-11 Computer, Heathkit Computer Advertisements, Decode Systems
- Computer Museum illustration of fully expanded H11 with the Heath/Zenith label.