INT 15h,  88h (136)      Get extended memory size                  XT-286, AT

Reports amount of memory above 1024K.

On entry:      AH         88h

Returns:       Carry      Set if error, else cleared
AX         Number of 1K blocks above 1024K

                                                                          

Notes:         This service is available only for the AT and XT-
286.

The amount of memory returned by this service is
stored in the CMOS battery. It is determined and set
during power-on.

For the memory above the 1024K range to be usable,
the planar memory (memory on the system board) must
be fully populated. The memory above the 1024K range
is often called "extended" memory.

See also: INT 12h
See also: 48h

INT 15h, 88h (136) Get extended memory size XT-286, AT