Compatibility: XMS 2.0+
Expects: AH    08H
Returns: AX    size of largest free XMB, in kbytes
BL    XMS error code (if BL >= 80H)
Info: This obtains the size, in K-bytes, of the largest free block of
extended memory.

Notes: The 64K-16 bytes of the HMA  are not included in this

See Also: XMS Functions
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XMS 08H: Query Free Extended Memory