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Int 15/AH=88h - SYSTEM - GET EXTENDED MEMORY SIZE (286+) -
AH = 88h
Return: CF clear if successful
AX = number of contiguous KB starting at absolute address 100000h
CF set on error
AH = status
80h invalid command (PC,PCjr)
86h unsupported function (XT,PS30)
Notes: TSRs which wish to allocate extended memory to themselves often hook
this call, and return a reduced memory size. They are then free to
use the memory between the new and old sizes at will.
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<h2>Int 15/AH=88h
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<h3><font color=#C00040>SYSTEM - GET EXTENDED MEMORY SIZE (286+)</font></h3>
<PRE>
AH = 88h<br>
<p><b>Return:</b><br>CF clear if successful
AX = number of contiguous KB starting at absolute address 100000h
CF set on error
AH = status
80h invalid command (PC,PCjr)
86h unsupported function (XT,PS30)
</PRE>
<p><b>Notes:</b>
TSRs which wish to allocate extended memory to themselves often hook
this call, and return a reduced memory size. They are then free to
use the memory between the new and old sizes at will..
The standard BIOS only returns memory between 1MB and 16MB; use AH=C7h
for memory beyond 16MB.
Not all BIOSes correctly return the carry flag, making this call
unreliable unless one first checks whether it is supported through
a mechanism other than calling the function and testing CF.
Due to applications not dealing with more than 24-bit descriptors
(286), Windows 3.0 has problems when this function reports more
than 15 MB. Some releases of HIMEM.SYS are therefore limited to use
only 15 MB, even when this function reports more.
<p><b>See Also:</b>
<a href="rb-1527.htm" tppabs="http://www.ctyme.com/intr/rb-1527.htm">AH=87h</a> - <a href="rb-1535.htm" tppabs="http://www.ctyme.com/intr/rb-1535.htm">AH=8Ah"Phoenix"</a> - <a href="rb-1611.htm" tppabs="http://www.ctyme.com/intr/rb-1611.htm">AH=C7h</a> - <a href="rb-1664.htm" tppabs="http://www.ctyme.com/intr/rb-1664.htm">AX=DA88h</a
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Int 15h</a>
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