Difference between revisions of "MS-DOS 1.25"

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'''MS-DOS 1.25''' was released in 1982-08 as the first general release to OEM customers other than IBM, so it was used by all the first clone manufacturers. Some OEMs labeled their release with different version numbers (e.g. COMPAQ), but they are all based on version 1.25<ref name="ref1">https://github.com/microsoft/MS-DOS/blob/master/v1.25/Tim_Paterson_16Dec2013_email.txt</ref>.
 
'''MS-DOS 1.25''' was released in 1982-08 as the first general release to OEM customers other than IBM, so it was used by all the first clone manufacturers. Some OEMs labeled their release with different version numbers (e.g. COMPAQ), but they are all based on version 1.25<ref name="ref1">https://github.com/microsoft/MS-DOS/blob/master/v1.25/Tim_Paterson_16Dec2013_email.txt</ref>.
  
It only supported 5.25" 160 KB floppies and there was no directories supported (all files must be located in the root directory). As a result of that, <code>\</code>, <code>/</code> and other symbols can be used in file names.
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It only supported 5.25" 160 KB floppies and there was no subdirectories support (all files must be located in the root directory). As a result of that, <code>\</code>, <code>/</code> and other symbols can be used in file names.
  
 
== Versioning ==
 
== Versioning ==

Revision as of 06:48, 5 August 2019

MS-DOS 1.25
Version of MS-DOS
MS-DOS 1.25 First Boot.png
Version1.25
Release date1982-08
Replaces
MS-DOS 1.24
Replaced by
MS-DOS 2.00

MS-DOS 1.25 was released in 1982-08 as the first general release to OEM customers other than IBM, so it was used by all the first clone manufacturers. Some OEMs labeled their release with different version numbers (e.g. COMPAQ), but they are all based on version 1.25[1].

It only supported 5.25" 160 KB floppies and there was no subdirectories support (all files must be located in the root directory). As a result of that, \, / and other symbols can be used in file names.

Versioning

MSDOS.SYS in this release should always report version 1.25 and COMMAND.COM will report version 1.17, 1.18 or custom versions depending on the revision. The original non-OEM MS-DOS 1.25's COMMAND.COM reports version 1.17 according to source code released by Microsoft.

Some OEM releases has an extra H or D at the end of the version string. H means the source was assembled with the HIGHMEM switch and D means the DSKTEST switch was used.

Changes from MS-DOS 1.24

MS-DOS 1.24 corresponds to IBM PC-DOS 1.10[1] and there is only one minor change between the two versions as described by the writer of DOS, Tim Paterson[1]. The change was a marker (00) being placed at end of the directory to speed up searches.

Internal commands

The Command Interpreter, COMMAND.COM, supported these commands:

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

Gallery

References