|Version of MS-DOS|
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.
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.
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
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 and there is only one minor change between the two versions as described by the writer of DOS, Tim Paterson. The change was a marker (
00) being placed at end of the directory to speed up searches.
The Command Interpreter,
COMMAND.COM, supported these commands: