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Copyright 1991 David Jurgens |
INT 21,4A - Modify Allocated Memory Block (SETBLOCK)
AH = 4A
BX = new requested block size in paragraphs
ES = segment of the block (MCB + 1 para)
on return:
AX = error code if CF set (see DOS ERROR CODES)
BX = maximum block size possible, if CF set and AX = 8
- modifies memory blocks allocated by INT 21,48
- can be used by programs to shrink or increase the size
of allocated memory
- PC-DOS version 2.1 and DOS 3.x will actually allocate the largest
available block if CF is set. BX will equal the size allocated.
- see also INT 21,49
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| Esc or Alt-X to exit |
int 21,4a |
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