Int 67/AX=2763h/CL=04h

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