Historical clue formulations

• PC platform of the 1980s — 2025-04-27
• 1980s PC standard — 2025-03-08
• Early PC platform — 2024-07-22
• Windows forerunner — 2023-07-10
• Early computer acronym — 2022-09-04
• Early PC software — 2021-11-14
• PC platform popular in the '80s — 2021-05-23
• It worked with a prompt — 2021-04-10
• Windows forerunner — 2021-03-14
• Early PC software — 2020-06-04
• Early PC platform — 2018-02-27
• Precursor to Windows — 2017-11-23
• Windows forerunner — 2017-10-07
• Windows precursor — 2017-08-22
• Early PC platform — 2016-09-25
• Platform in which you might see the prompt C:\> — 2016-08-03
• It ran on many clones — 2015-10-03
• Precursor of Windows — 2015-06-29
• Windows forerunner — 2015-06-08
• PCs once ran on it — 2015-05-17
• PC platform of old — 2014-04-06
• It was run in the 1980s-'90s — 2014-03-08
• Early I.B.M. PC standard — 2013-09-25
• Windows forerunner — 2012-08-16
• Operations were once commonly performed in this — 2012-06-22
• Environment of many old PCs — 2012-06-01
• Kind of PC command — 2011-09-24
• It worked from a prompt — 2011-08-13
• Windows precursor — 2009-12-20
• PC platform released in 1982 — 2009-10-06
• Platform introduced in 1981 — 2008-10-19
• Many PCs once ran on it — 2008-07-17
• Old PC standard — 2007-09-06
• Old PC platform — 2006-11-17
• Platform introduced in 1981 — 2006-09-29
• PC program — 2006-02-01
• Kind of PC command — 2005-10-28
• Windows predecessor — 2005-09-26
• 1980's PC's ran on it — 2004-10-11
• PC software — 2004-02-29
• Old PC installation — 2003-11-14
• Old PC software — 2003-06-01
• Common computer interface — 2002-09-18
• Forerunner of Windows — 2002-03-11
• Basic PC program — 2001-12-03
• Early IBM PC go-with — 2001-08-22
• It helps many machines run — 2001-03-11
• Computer acronym — 2000-01-01
• A PC may use it — 1999-08-08
• User interface — 1997-10-17