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Article View: comp.os.ms-windows.programmer.misc
Article #1850

Re: Herc cards and 486's and Windows !

#1850
From: cantua
Date: Thu, 24 Dec 1992 12:56
52 lines
2425 bytes
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.
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Message-ID: <BzrLAv.Bu6@cantua.canterbury.ac.nz>
Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!comp.vuw.ac.nz!canterbury.ac.nz!cosc.canterbury.ac.nz!cameron
References: <725148498snz@chrism.demon.co.uk>

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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
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