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- Newsgroups: comp.os.ms-windows.programmer.misc
- Path: sparky!uunet!munnari.oz.au!comp.vuw.ac.nz!canterbury.ac.nz!cosc.canterbury.ac.nz!cameron
- From: cameron@cosc.canterbury.ac.nz (cantua)
- Subject: Re: Herc cards and 486's and Windows !
- Message-ID: <BzrLAv.Bu6@cantua.canterbury.ac.nz>
- Nntp-Posting-Host: huia.canterbury.ac.nz
- Reply-To: cameron@cosc.canterbury.ac.nz
- References: <725148498snz@chrism.demon.co.uk>
- Date: Thu, 24 Dec 1992 12:56:54 GMT
- Lines: 53
-
- From article <725148498snz@chrism.demon.co.uk>, by chris@chrism.demon.co.uk (Chris Marriott):
- > In article <Bzp9Av.4FF@cantua.canterbury.ac.nz> cameron@cosc.canterbury.ac.nz writes:
- >
- >>
- >>Do you have a dual display working on a 486 under
- >>windows ?
- >>
- >> ......
- >>
- >>I've got DualDisplay=1 in my system.ini..and the herc card
- >>is a recent model. The machine isn't slowed down in normal
- >>DOS mode..
- >>
- >>SO what do I need to do to get the second display working
- >>on the 486 ? I've been through all available windows and
- >>Turbo C docs.. but the only setting I could find was
- >>the "dualdisplay=1" - make no difference..
- >>
- >>The vga card is a ET4000 is 1Mg RAM.. Machine is 33Mz TP
- >>486
- >>
- >> ....
- >
- > The reason for this slowdown is simple. If you have an 8-bit secondary
- > video card in your machine - which ALL mono card are - then the primary
- > colour video card is *also* forced into 8-bit mode. As you've discovered,
- > 8-bit access to a video card makes Windows s-l-o-w.
- >
- > There's absolutely no way around this - it's just the way the AT bus
- > works, unfortunately. If you must have dual displays, the only thing you
- > could do (if you're rich!) is have an 8514/a card such as an ATI Ultra
- > as your primary display, and 16-bit VGA as secondary.
- >
- > Personally, I live with CodeView on a single monitor. Not too bad, once
- > you get used to it.
- >
- > Chris
- > --
-
- Actually, I've found a temporary solution to my problem..
- I found that by using the standard Super VGA drivers that
- come with windows ie: 800,600 16 Color,
- all the problems have disappeared !! Screen updates are
- back to the speed they should be and no problems with the
- disk controller. I was using the ET4000
- 800x600 256 color drivers before..( with no problems until
- I put the herc card in)..
-
- So I guess switching down to 16 color mode is a reasonable
- compromise. But is this what should happen ??
-
- Cameron.
-
-