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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.
The Zenith Data Systems Z-100 is a pre-assembled version of the Heathkit H100 electronic kit. [2] In the same family, the Z-120 is an all-in-one model with self-contained monitor, and the Z-110 (called the low profile model) is similar in size to the cabinet of an IBM PC. [3]
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. [citation needed]
The Heath Company was founded as an aircraft company in 1911 [5] by Edward Bayard Heath with the purchase of Bates Aeroplane Co, soon renamed to E.B. Heath Aerial Vehicle Co. Starting in 1926 it sold a light aircraft, the Heath Parasol, in kit form. [6] Heath died during a 1931 test flight. [7]
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.
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