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Int 62 Fn 0089 u - Fgdriver V3.03 - "fg_scroll" - Vertically Scroll Scre [V]
AX = 0089h
BX = left edge column
CX = right edge column
DX = top edge row
SI = bottom edge row
DI = number of pixels by which to scroll (positive scrolls up,
negative scrolls down)
ES = type of scroll
0000h circular (rows scrolled off are copied to vacated rows)
else vacated rows are filled with the current color
Notes: For FGDRIVER v1.10, this function was "FG_SOUNDS" (see AX=009Eh);
"FG_SCROLL" was AX=0067h
In graphics modes, the left and right edges are adjusted to byte
boundaries if necessary
Circular scrolling uses part of the hidden page as a workspace
See Also: AX=0071h,AX=0095h
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