MS-DOS 1.25: Difference between revisions

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* '''Compaq DOS 1.12''' is an OEM release of MS-DOS 1.25 for Compaq Personal Computers. It was indicated by [http://support.microsoft.com/kb/63906 KB63906]. This version on the BA FTP is a Compaq OEM release for Compaq's IBM-compatibles and also one of the earliest MS-DOS versions in our collection. It comes on a single 5.25" 360kB. Included are some system utilities, such as BASIC, CHKDSK, DISKCOMP and others.
* '''Compaq DOS 1.12''' is an OEM release of MS-DOS 1.25 for Compaq Personal Computers. It was indicated by [http://support.microsoft.com/kb/63906 KB63906]. This version on the BA FTP is a Compaq OEM release for Compaq's IBM-compatibles and also one of the earliest MS-DOS versions in our collection. It comes on a single 5.25" 360kB. Included are some system utilities, such as BASIC, CHKDSK, DISKCOMP and others.


* '''Version 1.19''' is an OEM version for the Zenith Z-100 PC Compatible series, released in 1984, with <code>COMMAND.COM</code> version 1.19.
* '''Version 1.19''' is an OEM version for the Zenith Z-100 PC Compatible series, released in 1984, with <code>COMMAND.COM</code> release 1.19.
   
   
* '''Version 1.20''' is an OEM release of MS-DOS 1.25, also branded as Z-DOS. The OS reports version 1.20, Command release 1.00. It comes on 5.25" 360kB disk image that can be used in Microsoft Virtual PC. As with many other floppy releases, this one too has the modified OEM string in the boot sector (IHC at the end). Like most early OEM releases, this appears to be based on PC-DOS rather than MS-DOS, judging by the presence of <code>IBMBIO.COM</code> and <code>IBMDOS.COM</code>, which were used by IBM's PC-DOS (Microsoft used <code>IO.SYS</code> and <code>MS-DOS.SYS</code>).
* '''Version 1.20''' is an OEM release of MS-DOS 1.25, also branded as Z-DOS. The OS reports version 1.20, Command release 1.00. It comes on 5.25" 360kB disk image that can be used in Microsoft Virtual PC. As with many other floppy releases, this one too has the modified OEM string in the boot sector (IHC at the end). Like most early OEM releases, this appears to be based on PC-DOS rather than MS-DOS, judging by the presence of <code>IBMBIO.COM</code> and <code>IBMDOS.COM</code>, which were used by IBM's PC-DOS (Microsoft used <code>IO.SYS</code> and <code>MS-DOS.SYS</code>).
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== References ==
== References ==
<references></references>

Revision as of 11:08, 25 April 2019

MS-DOS 1.25 is the first version of MS-DOS, released in 1982-08. It was the first version licensed to OEMs beyond IBM or Seattle Computer Products[1] It only supported 5.25" 160 kB floppies and did not support folders (all files had to be located in the root directory). The command interperter, COMMAND.COM, supported these commands:

  • DIR
  • TYPE
  • COPY
  • ERASE
  • RENAME
  • PAUSE
  • REM

The source code for this version was released on 25 March 2014 by Microsoft and the Computer History Museum, along with a note from Tim Paterson from December 2013.

OEM releases

  • Compaq DOS 1.11 is one of the first releases of MS-DOS for PC-compatible OEMs, in this case, Compaq, for its early model of the Compaq Portable shipped in early 1983. From Compaq, available as Revision E.
  • Compaq DOS 1.12 is an OEM release of MS-DOS 1.25 for Compaq Personal Computers. It was indicated by KB63906. This version on the BA FTP is a Compaq OEM release for Compaq's IBM-compatibles and also one of the earliest MS-DOS versions in our collection. It comes on a single 5.25" 360kB. Included are some system utilities, such as BASIC, CHKDSK, DISKCOMP and others.
  • Version 1.19 is an OEM version for the Zenith Z-100 PC Compatible series, released in 1984, with COMMAND.COM release 1.19.
  • Version 1.20 is an OEM release of MS-DOS 1.25, also branded as Z-DOS. The OS reports version 1.20, Command release 1.00. It comes on 5.25" 360kB disk image that can be used in Microsoft Virtual PC. As with many other floppy releases, this one too has the modified OEM string in the boot sector (IHC at the end). Like most early OEM releases, this appears to be based on PC-DOS rather than MS-DOS, judging by the presence of IBMBIO.COM and IBMDOS.COM, which were used by IBM's PC-DOS (Microsoft used IO.SYS and MS-DOS.SYS).

References