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shidel merged 2 commits into from
May 21, 2026
+12 −3
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ecm 2026-05d #113

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bc2223a
21.4301: list attribute bit 6 as character device
ecm-pushbx May 19, 2026
dbeb3c2
21.4E: update character device size, v3/v4 label search bug
ecm-pushbx May 19, 2026
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4 changes: 2 additions & 2 deletions ...e/Interrupt List/INT 21 DOS Function Calls/INT 214301 DOS 2 CHMOD SET FILE ATTRIBUTES.txt
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Expand Up @@ -32,12 +32,12 @@ Bitfields for file attributes:
Bit(s) Description (Table 01420)
7 shareable (Novell NetWare)
7 pending deleted files (Novell DOS, OpenDOS)
6 unused
6 unused (character device for AH=4Eh)
5 archive
4 directory
3 volume label
execute-only (Novell NetWare)
2 system
1 hidden
0 read-only

11 changes: 10 additions & 1 deletion ...rupt List/INT 21 DOS Function Calls/INT 214E DOS 2 FINDFIRST FIND FIRST MATCHING FILE.txt
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Expand Up @@ -22,7 +22,8 @@ Notes: for search attributes other than 08h, all files with at MOST the
this call also returns successfully if given the name of a character
device without wildcards. DOS 2.x returns attribute 00h, size 0,
and the current date and time. DOS 3.0+ returns attribute 40h and
the current date and time.
the current date and time. MS-DOS v4.01 and v5.00 (at least) return
the file size equal to the character device header's segment.
immediately after an INT 2F/AX=B711h (APPEND return found name), the
name at DS:DX will be overwritten; if AL = 00h on entry, the actual
found pathname will be stored, otherwise, the actual found path
Expand All @@ -38,6 +39,14 @@ BUGS: under DOS 3.x and 4.x, the second and subsequent calls to this function
directory search without the volume-label bit. Such implicit
searches are performed by CREATE (AH=3Ch), OPEN (AH=3Dh), UNLINK
(AH=41h), and RENAME (AH=56h)
the above bug is actually the fact that the *first* call with the label
attribute and a character device name will find the character device,
whereas it is intended that a label search should only ever match a
label. MS-DOS v5.00 fixes this case by internally setting the Attrib
variable to the value from SAttrib (Search Attribute), so that the
DEVNAME function is able to detect the fact that a label search is in
progress, causing it to not match any character device. lDOS picked
this patch to its source text as of 2026-05-19.
DR DOS 3.41 and 5.0 return the Directory attribute for the volume label
SeeAlso: AH=11h,AH=4Fh,AX=4301h,AX=714Eh,AX=71A1h,AX=F257h/SF=02h
SeeAlso: INT 2F/AX=111Bh,INT 2F/AX=B711h
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