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.
| Developer | Heath Company / Gordon Letwin, Richard Musgrave |
|---|---|
| Working state | Discontinued |
| Source model | Open source |
| Initial release | 1978 |
| Latest release | 3.02 |
| Available in | English |
| Platforms | Heathkit H8, Heathkit H89, Zenith Z-89 |
| License | Public domain |
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.[1][2] Item references (Heathkit part number) are HOS-1-SL part number 595–2466.
Commands
editVersions
edit- HDOS 1.0 – written in 1978 by J. Gordon Letwin
- HDOS 1.5 – Gregg Chandler
- HDOS 1.6 – Gregg Chandler
- HDOS 2.0 – released in 1980, written by Gregg Chandler, released into the public domain in April 1988
- HDOS 3.0 – released into the public domain in August 1986
- HDOS 3.02 – enhanced version by Richard Musgrave
See also
edit
References
edit- ^ "Untitled". InfoWorld. 1980-09-01. p. 17. Retrieved 16 February 2015.
- ^ Needle, David (1982-09-13). "Personal touch: Zenith inherits do-it-yourself Heath fans". InfoWorld. pp. 24–25. Retrieved 29 June 2014.
- ^ Heath Company. "Software Reference Manual HDOS SYSTEM Chapter 2 General Operations" (PDF). Archived from the original (PDF) on 2017-08-07. Retrieved 2020-02-08.
- ^ HeathDOS Archived 2006-06-24 at the Wayback Machine
External links
edit- HeathDOS
- Michael A. Pechuria, Comparing Two Microcomputer Operating Systems: CP/M and HDOS. Communications of the ACM, March 1983, vol. 26, no. 3.
- Society of Eight-Bit Heathkit Computerists Archived 2012-03-28 at the Wayback Machine A web site dedicated to preserving the Heathkit 8-bit computers, source listing in PDF form