Date: Thu, 2 Jul 1998 04:12:26 -0700 (PDT) From: sos@FreeBSD.ORG To: smoergrd@oslo.geco-prakla.slb.com (Dag-Erling Coidan Smørgrav) Cc: sos@FreeBSD.ORG, nick.hibma@jrc.it, hackers@FreeBSD.ORG Subject: Re: Console driver (was: Problems with irq 9(2)?) Message-ID: <199807021112.EAA00304@hub.freebsd.org> In-Reply-To: <rx44sx04kbg.fsf@oslo.geco-prakla.slb.com> from =?ISO-8859-1?Q?Dag=2DErling_Coidan_Sm=F8rgrav?= at "Jul 2, 98 12:29:55 pm"
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In reply to Dag-Erling Coidan Smørgrav who wrote: > sos@freebsd.org writes: > > In reply to Dag-Erling Coidan Smørgrav who wrote: > > > However, no VGA board that I know of will exhibit snow while in text > > > mode, so waiting for vertical retrace is not necessary. It should not > > Well you dont know much then :), most modern videocards will > > "snow" when you muck with the font generator, you probably > > confuses this with writing to the screen buffer, which works > > on all VGA's etc etc... > > Ah. I didn't realize that we were talking font generator here. > > Honestly, I don't really see the point in having a nifty pseudo- > graphical mouse cursor in text mode. First, it's overkill because you > only need character resolution, not pixel resolution. Second, it > steals four characters from your character set. Third, it doesn't work > properly (or at least doesn't look good) in all modes. First, I need char resolution in some apps, strange but true. Second, 256 chars is not enough anyways, so having 252 is just a little worse. Third, it was done by "popular demand", so there is use for it. Fourth, it was fun doing :) > Of all the VGA adapters I've ever laid eyes on, the only one to > generate an interrupt on vertical retrace is an old VLB S3 86c805 > based accelerator, and even that one has a jumper for it which is off > by factory default. I currently own two S3 cards, one TSeng Labs card, > and a bunch of no-brand Cirrus Logic and Western Digital based cards. And some has it tied to NMI yikes! so if you enable it in the regs you will get really funny results... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Soren Schmidt (sos@FreeBSD.org) FreeBSD Core Team So much code to hack -- so little time. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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