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AX = D201h
BX = 4849h ("HI")
CX = 5241h ("RA")
DX = 4D30h ("M0")
Return:
BX = 4F4Bh ("OK")
CX = segment of start of HIRAM chain
DX = reserved block owner (QEMM/QRAM code segment)
Range:
AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h
Note: The HIRAM memory chain has the same format as the regular DOS 4.0 memory chain (see #01628 at INT 21/AH=52h), except that XMS Upper Memory Blocks have the block header program name field set to "UMB"; blocks whose "owner" field is set to the reserved segment returned in DX are locked-out regions such as video memory and ROMs.
See Also: AX=12FFh/BX=0006h - AX=D200h
Category: Memory Management - Int 2Fh - Q
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