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AH = 58h AL = subfunction 02h get UMB link stateReturn:
AL = current link state 00h UMBs not part of DOS memory chain 01h UMBs in DOS memory chain 03h set UMB link state BX = new link state 0000h remove UMBs from DOS memory chain 0001h add UMBs to DOS memory chain
Return:
CF clear if successful CF set on error AX = error code (01h) (see #01680)
Notes: A program which changes the UMB link state should restore it before terminating. UMBs will only be available if CONFIG.SYS contains the line DOS=UMB, the UMBs have been linked into the memory chain with AX=5803h, and the allocation strategy has been set to include high memory with AX=5801h
See Also: #01687 - #02766 at INT 2F/AX=4310h
Category: DOS Kernel - Int 21h - D
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