Editing IBM Personal Computer (section)

==Software==
[[File:IBM 5154 - PC DOS Prompt.jpg|thumb|PC DOS 3.30 running on an IBM PC]]
[[File:Digital Research CP-M-86 for the IBM Personal Computer Version 1.0 720x400.png|thumb|[[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|UCSD p-System]],<ref>{{Cite book|url=https://archive.org/stream/byte-magazine-1982-01/1982_01_BYTE_07-01_The_IBM_Personal_Computer#page/n41/mode/2up|title=Byte Magazine Volume 07 Number 01 - The IBM Personal Computer|date=January 1982}} {{verify source |date=November 2020 |reason=This ref was deleted Special:Diff/990243364 by a bug in VisualEditor and later restored by a bot from the original cite located at Special:Permalink/990243296 cite #62 - verify the cite is accurate and delete this template. [[User:GreenC_bot/Job_18]]}}</ref> and an in-house product called [[IBM PC DOS]], based on [[86-DOS]] from [[Seattle Computer Products]] and provided by [[Microsoft]].<ref name="freibergeros19811005">{{cite news|author=Freiberger, Paul|date=October 5, 1981|title=Some Confusion at the Heart of IBM Microcomputer / Which Operating System Will Prevail?|pages=50–51|work=InfoWorld|url=https://books.google.com/books?id=JT0EAAAAMBAJ&pg=RA1-PA50|access-date=January 1, 2015}}</ref>{{r|morgan198201}} In practice, IBM's expectation and intent was for the market to primarily use PC DOS.<ref name="bunnell19820405">{{cite news | url=https://books.google.com/books?id=w_OhaFDePS4C | title=Boca Diary | work=PC Magazine | date=April–May 1982 | access-date=October 21, 2013 | author=Bunnell, David | page=22}}</ref> CP/M-86 was not available for six months after the PC's release<ref name="edlin19820607">{{cite news|author=Edlin, Jim|date=June–July 1982|title=CP/M Arrives|page=43|work=PC Magazine|url=https://books.google.com/books?id=w_OhaFDePS4C&pg=RA2-PA43|access-date=October 21, 2013}}</ref> and received extremely few orders once it was,<ref name="pcommuniques198302">{{cite news|date=February 1983|title=PCommuniques|page=53|work=PC Magazine|url=https://books.google.com/books?id=7wCiNAUEuAMC&pg=PA53|access-date=October 21, 2013}}</ref> 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 (four 8&nbsp;KB chips), 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&nbsp;KB SSDD floppies, but version 1.1, which was released nine months after the PC's introduction, supported 160&nbsp;KB SSDD and 320&nbsp;KB DSDD floppies. Support for the slightly larger nine sector per track 180&nbsp;KB and 360&nbsp;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.