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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 .
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.
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.
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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 ...
Two County Fermanagh brothers who scammed elderly homeowners in the United States out of hundreds of thousands of dollars have been sentenced to 18 months in a US prison and face likely deportation.
In particular, officers said they were after CCTV, doorbell and dashcam footage from between 19:00-21:00 GMT in Heanor Road, Rose Avenue, Summerfields Way, Kedleston Drive and Peveril Drive.
Adequate intake of BCAAs facilitates muscle repair. Healing can take a few days, so having enough BCAAs to optimize muscle protein synthesis makes your muscles’ active-recovery window more ...