Int 80  U - Ami Bios V1.00.12.ax1t - Internal - Bios Subsystem Selection   [b]

   AH = function
       00h install and initialize BIOS subsystem
       AL = ??? (00h,01h,03h)
       CX:BX = subsystem ID (see #3642)
       ESI = address from which to load, or 00000000h for default for
           subsystem
       EDI = physical address at which to install, or 0 for default

       Note:   if CX=0000h on entry, this call is applied to all
             subsystems whose ID has low word BX
       01h get BIOS subsystem information
       CX:BX = subsystem ID (see #3642)

       Return: AL = ???
           AH = ???
           EDX = uncompressed size of subsystem in bytes
           SI = offset within subsystem of initialization
               routine, or FFFFh if none
           EDI = physical address of default location or 0
       02h get matching subsystem identifier
       AL = index into subsystem list (return ALth occurrence
             matching BX)
       BX = low word of subsystem identifier
           (0001h,0002h,0004h,0005h,000Bh,FFFFh)

       Return: CF clear if successful
               CX = high word of ALth matching subsystem
           CF set on error

       Note:   the system is halted if AL=00h on entry
       03h set up "big real" mode (4G segment limits)
       04h turn off "big real" mode (restore 64K segment limits)
       05h remove BIOS subsystem
       CX:BX = subsystem ID to leave out

       Note:   the system is halted if an invalid (not installed)
             subsystem ID is specified
       06h get installed subsystem info
       CX:BX = subsystem ID (see #3642)

       Return: CF clear
           EDX = length of ???
           EDI = linear address of start of ???

       Note:   the system is halted if an invalid (not installed)
             subsystem ID is specified

Return: CF clear if successful
   CF set on non-fatal error

Note:  this interrupt vector is cleared to 0000h:0000h near the end of the
     BIOS startup sequence

(Table 3642)
Values for AMI BIOS subsystem ID:
 00010001h ROM BIOS @F000-FFFF
 00010002h setup??? (loaded @6000-68FF)
 00010005h APM code
 0001000Bh language-specific error message set (English)
 00020002h PnP/PCI ACFG code (loaded @F000-F1FF)
 0001FFFFh
 0002FFFFh recovery code
 00030004h
 0003FFFFh BIOS decompression code
 0004000Bh
 00060004h
 0100FFFFh ACFG data
 10000000h ROM @C000 (64K)
 10000001h HMA (48K)
 10000002h RAM @7A00 (24K)
 10000003h RAM @8000-BFFF
 10000004h
 10000005h real-mode address space (0-1M)
 1000000Bh installed language-specific message set???