XMS 11H: Release Upper Memory Block
Compatibility: XMS 2.0+
Expects: AH 11H
DX segment address of he UMB (as obtained via XMS 10H)
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Returns: AX status: 0000H = successful
0001H = error and BL=XMS error code (if BL >= 80H)
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Info: This frees ownership of a UMB obtained via XMS 10H (request UMB).
See Accessing Upper Memory for the correct (DOS-blessed) way to
get and release a UMB when running DOS 3.0+.
Notes: When a UMB has been released, any code and data in it becomes
invalid and should not be accessed.
See Also: XMS Functions
Extended Memory Specification (XMS)
DOS Functions
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