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| | Disk operating system |
 | | Most home computer DOS'es were stored on a floppy disk always to be booted at start-up, with the notable exception of Commodore, whose DOS resided on ROM chips in the disk drivess themselves, available at power-on. |
 | | In large machines there were other disk operating systems (eg, IBM's VM, DEC's RSTS / RT-11 / VMS / TOPS-10 / TWENEX, MIT's ITS / CTSS, Control Data's assorted NOS variants, Harris's Vulcan, Bell Labs' Unix, and so on. |
 | | In microsocmputers, SWTPC's 6800 and 6809 machines used TSC 's FLEX disk operating system, Radio Shack 's TRS-80 machines used TRS-DOS, their Color Computer used OS-9, and most of the Intel 8080 based machines from IMSAI, MITS (makers of the legendary Altair 8800), Cromemco, North Star, etc used the CP/M-80 disk operating system. |
| www.sciencedaily.com /encyclopedia/disk_operating_system (594 words) |
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