Int 4B/AX=8104h

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Virtual DMA Specification - UNLOCK DMA REGION

AX = 8104h
DX = flags

bit 0:
Reserved (zero)

bit 1:
Data should be copied out of buffer bits 2-15 reserved (zero). ES:DI -> DMA descriptor structure (see #03221,#03222) with region size, physical address, and buffer ID fields set

Return:
CF clear if successful DDS physical address field set DDS buffer ID field set (0000h if no buffer allocated) CF set on error AL = error code (see #03218) DDS region size field filled wth maximum contiguous length in bytes

Note: Windows 3.0 does not check whether the region extends beyond the end of a segment

BUG: Windows 3.0 in enhanced mode does not return a correct code on error

See Also: AX=8103h - AX=8106h

Category: Disk I/O Enhancements - Int 4Bh - V

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