Int 67H [EMS 4.0] Function 5BH (91) Subfunction 07H Disable DMA on alternate map register set

Disables DMA accesses for all DMA channels associated with a specific alternate map register set.

Call with:

AH = 5BH

AL = 07H

BL = alternate register set number

Returns:

If function successful

AH = 00H

If function unsuccessful

AH = error code

Note:

This function is intended for use by operating systems only and can be disabled by the operating system at any time.