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hdo
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There are 3 letters in HDO ( D2H4O1 )
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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. * HDOS originally came with a limited set of system software tools, including an assembler, but many commercial and large set of freeware programs from HUG (Heath User Group) became available for it eventually. * HDOS 2.0 is notable because it was one of the first microcomputer operating systems to use loadable device drivers to achieve a degree of device independence and extensibility. Device names followed the RSX-11-style convention of DKn: where the first two letters were the device driver file name and n was a number (DK0:, DK1:, and so on would all be handled by DK.SYS). Other similarities to RSX included the use of PIP for file transfer, and the use of EOT for file termination. * Similar to how Heath/Zenith published complete schematics and part lists for its computers, the company sold to users the source code for HDOS. The full source paper listing is held at yesterpc.org, old computer museum. Item references (Heathkit part number) are HOS-1-SL part number 595-2466. |