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https://en.wikipedia.org/wiki/IBM_Personal_Computer
Software
PC-DOS 3.30 running on an IBM PC
Digital Research CP/M-86 Version 1.0 for the IBM PC
IBM initially announced intent to support multiple operating systems: CP/M-86, UCSD p-System,[63] and an in-house product called IBM PC DOS, developed by Microsoft.[64] [8] In practice, IBM's expectation and intent was for the market to primarily use PC-DOS,[65] CP/M-86 was not available for six months after the PC's release[66] and received extremely few orders once it was,[67] and p-System was also not available at release. PC DOS rapidly established itself as the standard OS for the PC and remained the standard for over a decade, with a variant being sold by Microsoft themselves as MS-DOS.
The PC included BASIC in ROM, a common feature of 1980s home computers. Its ROM BASIC supported the cassette tape interface, but PC DOS did not, limiting use of that interface to BASIC only.
PC DOS version 1.00 supported only 160 kB SSDD floppies, but version 1.1, which was released nine months after the PC's introduction, supported 160 kB SSDD and 320 kB DSDD floppies. Support for the slightly larger nine sector per track 180 kB and 360 kB formats was added in March 1983.
Third-party software support grew extremely quickly, and within a year the PC platform was supplied with a vast array of titles for any conceivable purpose |
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