Date: Tue, 24 Jul 2001 11:46:34 -0400 From: Christopher Sean Hilton <chris@vindaloo.com> To: freebsd-questions@freebsd.org Subject: Help getting raster text mode to 1024x768x4bpp. Message-ID: <20010724114633.A3262@andale.vindaloo.com>
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I've been wondering why syscons raster graphics mode does not support 1024
by 768 mode and I appear to have found the answer in this comment from
/sys/dev/syscons/scvidctl.c:
/*
* set_pixel_mode() currently does not support video modes whose
* memory size is larger than 64K. Because such modes require
* bank switching to access the entire screen. XXX
*/
So the reason that 1024x768 is not supported for raster text is because it
requires a 96k buffer and bank switching.
It's been since the late 1980's since I've played around with EGA/VGA video
hardware.
Does anyone know what is required to bank switch a VGA card?
Is this operation different for each VGA card by type?
--
Chris Hilton chilton-at-vindaloo-dot-com
------------------------------------------------------------------------
"All I was doing was trying to get home from work!"
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