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AX = 1AA9h
Return:
AL = status 00h successful BX = current number of lines in scrollback buffer CX = number of bytes in one line 01h unsupported video mode active 02h screen currently scrolled back 03h reduced capability driver A9h unsupported function (driver before v3.10)
Desc: Determine how much data is in the scrollback buffer and initialize scrollback retrieval to return the first line on the next call to AX=1AA8h
See Also: AX=1A00h/BX=414Eh - AX=1AA8h
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