Messages in this thread | | | Date | Thu, 9 Jul 1998 20:00:23 +0300 (EET DST) | From | Tuukka Toivonen <> | Subject | Re: Console thoughts |
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> Another interesting thought: Make scrolling on the VGA even faster by >not copying the screen at all (cards capable of 64KB circular buffer >only).
Wouldn't it be possible to create circular buffer with this:
3d4h index 18h (r/W): CRTC: Line Compare Register bit 0-7 Lower 8 bits of the Line Compare. When the Line counter reaches this value, the display address wraps to 0. Privides Split Screen facilities. Bit 8 is found in 3d4h index 7 bit 4. (VGA Only) Bit 9 is found in 3d4h index 9 bit 6.
(this is from vga.doc) Works on any EGA/VGA.
(By the way, vga.doc has some nasty errors here and there... I wouldn't blindly trust to numbers above).
-- | Tuukka Toivonen <tuukkat@ee.oulu.fi> [PGP public key | Homepage: http://www.ee.oulu.fi/~tuukkat/ available] | Try also finger -l tuukkat@ee.oulu.fi | Studying information engineering at the University of Oulu +-----------------------------------------------------------
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