The Heathkit H11 Computer is an early
kit
Kit may refer to:
Places
*Kitt, Indiana, US, formerly Kit
* Kit, Iran, a village in Mazandaran Province
* Kit Hill, Cornwall, England
People
* Kit (given name), a list of people and fictional characters
* Kit (surname)
Animals
* Young animal ...
-format personal computer introduced in 1978. It is essentially a
Digital Equipment
Digital Equipment Corporation (DEC ), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The company was co-founded by Ken Olsen and Harlan Anderson in 1957. Olsen was president until ...
PDP-11
The PDP-11 is a series of 16-bit minicomputers sold by Digital Equipment Corporation (DEC) from 1970 into the 1990s, one of a set of products in the Programmed Data Processor (PDP) series. In total, around 600,000 PDP-11s of all models were sol ...
in a small-form-factor case, designed by
Heathkit
Heathkit is the brand name of kits and other electronic products produced and marketed by the Heath Company. The products over the decades have included electronic test equipment, high fidelity home audio equipment, television receivers, amateu ...
. The H11 is one of the first
16-bit
16-bit microcomputers are microcomputers that use 16-bit microprocessors.
A 16-bit register can store 216 different values. The range of integer values that can be stored in 16 bits depends on the integer representation used. With the two ...
personal computer
A personal computer (PC) is a multi-purpose microcomputer whose size, capabilities, and price make it feasible for individual use. Personal computers are intended to be operated directly by an end user, rather than by a computer expert or te ...
s, at a list price of US$1,295,
() but it also requires at least a
computer terminal
A computer terminal is an electronic or electromechanical hardware device that can be used for entering data into, and transcribing data from, a computer or a computing system. The teletype was an example of an early-day hard-copy terminal and ...
and some form of storage to make it useful. It was too expensive for most Heathkit customers, and was discontinued in 1982.
Specifications
The H11 featured:
[1977 advertising material from Heathkit of ]Benton Harbor, Michigan
Benton Harbor is a city in Berrien County in the U.S. state of Michigan. It is 46 miles southwest of Kalamazoo and 71 miles southwest of Grand Rapids. According to the 2020 census, its population was 9,103. It is the smaller, by population, ...
.
* 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
The Q-bus,Schmidt, Atlant G.,Unibus,Q-Bus and VAXBI Bus, in ''Digital bus handbook'', Di Giacomo Joseph Ed., McGraw Hill, 1990 also known as the LSI-11 Bus, is one of several bus technologies used with PDP and MicroVAX computer systems previo ...
slots
* Storage — H27 8-inch
floppy drive
A floppy disk or floppy diskette (casually referred to as a floppy, or a diskette) is an obsolescent type of disk storage composed of a thin and flexible disk of a magnetic storage medium in a square or nearly square plastic enclosure lined w ...
(2 256k 8-inch single sided drives) or
paper tape
Five- and eight-hole punched paper tape
Paper tape reader on the Harwell computer with a small piece of five-hole tape connected in a circle – creating a physical program loop
Punched tape or perforated paper tape is a form of data storage ...
* I/O — serial (
RS-232
In telecommunications, RS-232 or Recommended Standard 232 is a standard originally introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a ''DTE'' ('' data terminal equipment'') suc ...
) or parallel ports
* Operating system —
HT-11 (a simplified version of
RT-11
RT-11 (Real-time 11) is a discontinued small, low-end, single-user real-time operating system for the full line of Digital Equipment Corporation PDP-11 16-bit computers. RT-11 was first implemented in 1970. It was widely used for real-time computin ...
)
* Instruction set —
PDP-11/40
The PDP-11 is a series of 16-bit computing, 16-bit minicomputers sold by Digital Equipment Corporation (DEC) from 1970 into the 1990s, one of a set of products in the Programmed Data Processor (PDP) series. In total, around 600,000 PDP-11s of all ...
instruction set
* Languages —
BASIC
BASIC (Beginners' All-purpose Symbolic Instruction Code) is a family of general-purpose, high-level programming languages designed for ease of use. The original version was created by John G. Kemeny and Thomas E. Kurtz at Dartmouth College ...
,
Focal and others
Initial memory limitations restrict the selection of system software, but the system can be expanded to 32KW x 16-bit RAM. 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
*
Elektronika BK
The Electronika BK is a series of 16-bit PDP-11-compatible home computers developed under the Electronika brand by NPO Scientific Center, then the leading microcomputer design team in the Soviet Union. It is also the predecessor of the more powe ...
*
Heathkit H8
Heathkit's H8 is an Intel 8080A-based microcomputer sold in kit form starting in 1977. The H8 is similar to the S-100 bus computers of the era, and like those machines is often used with the CP/M operating system on floppy disk.
The main diffe ...
References
{{Reflist
External links
Heathkit H-11 Computer Heathkit Computer Advertisements, Decode Systems
Early microcomputers
PDP-11
16-bit computers
Heathkit computers