Int 2F/AX=1223h

DOS 3.0+ internal - CHECK IF CHARACTER DEVICE

AX = 1223h
DS = DOS DS
SS = DOS DS (must be using a DOS internal stack)
SDA+218h (DOS 3.10-3.30) = eight-character blank-padded name
SDA+22Bh (DOS 4.0-6.0) = eight-character blank-padded name
SDA file attribute field set
direction flag clear (i.e. CLD)

Return:
CF set if no character device by that name found
CF clear if found
BH bits 4-0 copied from low byte of device attribute word
BH bit 5 set, bits 7-6 clear

Notes: Can only be called from within DOS. The check is skipped (always says "not device") if the volume ID bit of the file attribute field is set on entry

See Also: INT 21/AX=5D06h - INT 21/AX=5D0Bh

Category: DOS Kernel - Int 2Fh - D

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