Int 21/AH=73h

MS-DOS 7 - DRIVE LOCKING AND FLUSHING

AH = 73h
DL = drive (0=current, 1=A:, etc.)
CL = which flag to get or set
00h drive flag???
01h drive's dirty-buffers flag
AL = subfunction
00h get indicated flag
01h set ???
CH = new value for indicated flag
bit 1:
??? (CL=00h only)
bit 3:
Dirty buffers exist for selected drive (CL=01h only)

Return:
CF clear if successful
for AL=00h:
AL = value of CL on entry
for CL=00h:
AH = new flag and 06h (i.e. bits 1 and 2 used)
for CL=01h:
AH = new flag and 08h (i.e. bit 3 used)
(flag being taken from a table of bytes).
CF set on error
AX = error code (01h,0Fh,etc.) (see #01680)
7300h if function not supported

Note: These two subfunctions are available even when only the MS-DOS kernel is running

Category: DOS Kernel - Int 21h - M

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