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AH = 03h BH = page number 0-3 in modes 2&3 0-7 in modes 0&1 0 in graphics modes
Return:
AX = 0000h (Phoenix BIOS) CH = start scan line CL = end scan line DH = row (00h is top) DL = column (00h is left)
Notes: A separate cursor is maintained for each of up to 8 display pages. Many ROM BIOSes incorrectly return the default size for a color display (start 06h, end 07h) when a monochrome display is attached. With PhysTechSoft's PTS ROM-DOS the BH value is ignored on entry.
See Also: AH=01h - AH=02h - AH=12h/BL=34h - MEM 0040h:0050h - MEM 0040h:0060h
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