Format of MS-DOS 5+ UMB control block

[ Back ] [ Next ]

Offset

Size

Description

00h

BYTE

type:

5Ah	if last block in chain
4Dh	otherwise

01h

WORD

first available paragraph in UMB if control block at start of UMB, 000Ah if control block at end of UMB

03h

WORD

length in paragraphs of following UMB or locked-out region

05h

3 BYTEs

unused

08h

8 BYTEs

block type name:

"UMB"	if start block
"SM"	if end block in UMB

See Also:

#01628,#01631