From owner-freebsd-questions Tue Jul 24 8:47: 0 2001 Delivered-To: freebsd-questions@freebsd.org Received: from fw.vindaloo.com (ool-182dd047.dyn.optonline.net [24.45.208.71]) by hub.freebsd.org (Postfix) with ESMTP id E03E137B405 for ; Tue, 24 Jul 2001 08:46:50 -0700 (PDT) (envelope-from chris@vindaloo.com) Received: (from uucp@localhost) by fw.vindaloo.com (8.10.1/8.10.1) id f6OFkor09433 for ; Tue, 24 Jul 2001 11:46:50 -0400 (EDT) Received: from andale.vindaloo.com(192.168.133.3) via SMTP by fw.vindaloo.com, id smtpdsL1918; Tue Jul 24 11:46:40 2001 Received: by andale.vindaloo.com (Postfix, from userid 1000) id F28EA4383; Tue, 24 Jul 2001 11:46:34 -0400 (EDT) Date: Tue, 24 Jul 2001 11:46:34 -0400 From: Christopher Sean Hilton To: freebsd-questions@freebsd.org Subject: Help getting raster text mode to 1024x768x4bpp. Message-ID: <20010724114633.A3262@andale.vindaloo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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!" -- Rosa Parks To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message