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- Newsgroups: comp.os.ms-windows.programmer.misc
- From: chris@chrism.demon.co.uk (Chris Marriott)
- Path: sparky!uunet!pipex!demon!chrism.demon.co.uk!chris
- Subject: Re: Herc cards and 486's and Windows !
- Distribution: world
- References: <Bzp9Av.4FF@cantua.canterbury.ac.nz>
- Organization: None
- Reply-To: chris@chrism.demon.co.uk
- X-Mailer: Simple NEWS 1.90 (ka9q DIS 1.19)
- Lines: 52
- Date: Wed, 23 Dec 1992 22:08:18 +0000
- Message-ID: <725148498snz@chrism.demon.co.uk>
- Sender: usenet@demon.co.uk
-
- 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 can get a Herc card and mono monitor working in my 486
- >together with main VGA display card and monitor. Turbo
- >Debugger uses it fine... BUT the whole windows environment
- >is slowed down (screen updates) when the herc card is
- >in place, also problems with the hard disk controller..
- >
- >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
- >
- >Thanks
- >Cameron.
- >
- >
- >
-
- 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
- --
- --------------------------------------------------------------------------
- | Chris Marriott | chris@chrism.demon.co.uk |
- | Warrington, UK | BIX: cmarriott |
- | (Still awaiting inspiration | CIX: cmarriott |
- | for a witty .sig .... ) | CompuServe: 100113,1140 |
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