support up to LASTDRIVE=32 (lDOS or patched MS-DOS v7) #180
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Changing to a drive or running DIR with only a drive letter and
colon didn't work. (DIR with drive letter, colon, backslash did
work already.) Without this patch applied:
C:\>]:
Bad command or filename - "]:".
C:\>dir ]:
File not found. - ']:'
C:\>dir ]:\
Volume in drive ] is SRDXMS 2.10
Directory of ]:\
LDEBUG COM 94,208 09-19-25 6:35p
1 file(s) 94,208 bytes
0 dir(s) 948,224 bytes free
With this patch applied:
C:\>]:
]:\>dir ]:
Volume in drive ] is SRDXMS 2.10
Directory of ]:\
LDEBUG COM 94,208 09-19-25 6:35p
1 file(s) 94,208 bytes
0 dir(s) 948,224 bytes free
Contributor
Author
|
Test case is to run MS-DOS v7.10 with config.sys Drive letters like |
Contributor
Author
|
Drive letter, colon, program name also fails prior to this patch. Fine with a backslash: Working with this patch: |
ecm-pushbx
added a commit
to ecm-pushbx/dosemu2
that referenced
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Sep 27, 2025
lredir actually already worked to create or delete drives up to and including drive `: but beyond [: they were inaccessible. [: itself worked only partially (probably no int 2Fh function 110Ch). Now mfs supports all possible drives as desired. This requires setting eg LASTDRIVE=32 in config.sys or ldos.ini, or for lDOS only running with `append lastdrive 32` in the kernel command line. Test cases: C:\>type testmfs.bat lredir %1: /home/[user]/proj/devload lredir dir %1: lredir -d %1: The DIR command in this batch file requires the FreeCOM patch in FDOS/freecom#180 Different test case: ldebug ext extlib.eld dosspace `: This runs DOS interrupt 21h function 36h, which in turn calls int 2Fh function 110Ch. Some uses of the very last drive letter, `:, require a patch for working under MS-DOS v7: https://pushbx.org/ecm/test/20250926.3/
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Changing to a drive or running DIR with only a drive letter and colon didn't work. (DIR with drive letter, colon, backslash did work already.) Without this patch applied:
With this patch applied: