Deallocates a DMA register set that was previously allocated with Int 67H Function 5BH Subfunction 05H.
Call with:
AH = 5BH
AL = 08H
BL = DMA 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.