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Category: BIOS
INT 15 - 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.
        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.
SeeAlso: AH=87h,AH=8Ah"Phoenix",AH=C7h,AX=DA88h,AX=E801h,AX=E820h
Category: BIOS
INT 15 - SYSTEM - COPY EXTENDED MEMORY
        AH = 87h
        CX = number of words to copy (max 8000h)
        ES:SI -> global descriptor table (see
#00499
)
Return: CF set on error
        CF clear if successful
        AH = status (see
#00498
)
Notes:        copy is done in protected mode with interrupts disabled by the default
          BIOS handler; many 386 memory managers perform the copy with
          interrupts enabled
        on the PS/2 30-286 & "Tortuga" this function does not use the port 92h
          for A20 control, but instead uses the keyboard controller (8042).
          Reportedly this may cause the system to crash when access to the
          8042 is disabled in password server mode (see also PORT 0064h,#P0398)
        this function is incompatible with the OS/2 compatibility box
SeeAlso: AH=88h,AH=89h,INT 1F/AH=90h
#00499
Format of global descriptor table:
Offset        Size        Description        )
00h 16 BYTEs        zeros (used by BIOS)
10h        WORD        source segment length in bytes (2*CX-1 or greater)
12h  3 BYTEs        24-bit linear source address, low byte first
15h        BYTE        source segment access rights (93h)
16h        WORD        (286) zero
                (386+) extended access rights and high byte of source address
18h        WORD        destination segment length in bytes (2*CX-1 or greater)
1Ah  3 BYTEs        24-bit linear destination address, low byte first
1Dh        BYTE        destination segment access rights (93h)
1Eh        WORD        (286) zero
                (386+) extended access rights and high byte of destin. address
20h 16 BYTEs        zeros (used by BIOS to build CS and SS descriptors)
#00498
Values for extended-memory copy status:
00h        source copied into destination
01h        parity error
02h        interrupt error
03h        address line 20 gating failed
80h        invalid command (PC,PCjr)
86h        unsupported function (XT,PS30)
               
               
               
               

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