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Zenith Data Systems Corporation (ZDS) was an American computer systems manufacturing company active from 1979 to 1996.It was originally a division of the Zenith Radio Company (later Zenith Electronics), after they had purchased the Heath Company and, by extension, their Heathkit line of electronic kits and kit microcomputers, from Schlumberger in October 1979.
HDOS is an early microcomputer operating system, originally written for the Heathkit H8 computer system and later also available for the Heathkit H89 and Zenith Z-89 computers. The author was Heath Company employee Gordon Letwin , who later was an early employee of Microsoft and lead architect of OS/2 .
While the H11 was popular with hard-core hobbyists, Heath engineers realized that DEC's low-end PDP-11 microprocessors would not be able to get Heath up the road to more powerful systems at an affordable price. Heath/Zenith then designed a dual Intel 8085/8088-based system dubbed the H100 (or Z-100, in assembled form, sold by ZDS). The machine ...
The Heath Company began the HERO 1 project in October 1979, with the first release in 1982. [1] Models include the HERO 1, HERO Jr., and HERO 2000. Heathkit supported the HERO robot line until 1995. The units were either sold as assembly kits or prebuilt by Heathkit for an additional fee.
In 1979, Zenith entered the computer market with the purchase of Heath Company from Schlumberger for $64.5 million, forming Zenith Data Systems (ZDS). [17] The company changed its name to Zenith Electronics Corporation in 1984 to reflect its interests in computers and CATV , having left the radio business two years earlier.
The Zenith Z-89 is based on the Zilog Z80 microprocessor running at 2.048 MHz, and supports the HDOS and CP/M operating systems. The US$2295 Z-89 is integrated in a terminal-like enclosure with a non-detachable keyboard, 12-inch monochrome CRT with a 80x25 character screen, 48 KB RAM, and a 5.25" floppy disk drive.
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.
Similarly, the article notes: "DESA sold a large portion of the collection of legacy kit schematics and manuals in late 2008..." DESA never owned Heathkit, the "Heathkit-Zenith" trade name and motion-lighting control division was sold to DESA about 1998. Heathkit, not DESA, sold the manual collection to Mr. Peterson.
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