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AX = 2763h CL = 04h BX = signature AAFFh
Return:
AH = 00h if successful DX = block size in kilobytes
Desc: Returns the amount of EMS which can be safely used at any time, and can't be destroyed by writing anything to the B800:0000 buffer.
Note: This function normally returns 184K, while the driver provides up to 240K of EMS.
See Also: AX=2763h/CL=01h - AX=2763h/CL=02h
Category: Memory Management - Int 67h - V
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