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From: bmarsh@cod.NOSC.MIL (William C. Marsh)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Dual monitors
Message-ID: <2828@cod.NOSC.MIL>
Date: 14 Feb 91 21:39:28 GMT
References: <166@cf_su20.cf_su10.Sbi.COM> <169@cf_su20.cf_su10.Sbi.COM> <176@cf_su20.cf_su10.Sbi.COM>
Organization: Naval Ocean Systems Center, San Diego
Lines: 34

In article <176@cf_su20.cf_su10.Sbi.COM> nee@cf_su14.Salomon.Com (Robert Nee) writes:
>> And anyway, all memory accesses to video memory is sync'd to H or V retrace
>> time, so 16 vr. 8 bits really don't amount to much.

>Hmmm.  On my system it amounts to about a 32% speed degredation.  This
>is also very noticable in windows.  I am not just spouting useless
>figures.  

You cannot use a windows based program for performing graphics benchmarks.
There is too much system in the way.  To properly test graphic board 
performance, you must talk directly to the hardware.  No BIOS, No Windows,
No DV, etc.

>Do you have a monochome adapter?  Have you run you own benchmarks?

Yes, and Yes.  I write graphics animation software as a side job, and I
do not notice any speed degredation with a mono monitor or not.

>Do you want a copy of the ones I have been using?  What are the
>results in your own tests?  What video board are you using?

I use a Video 7 (now Headland) VRAM VGA with 512K on it, and a no-name clone
of the Hercules (Actually, the manual is a copy of the Hercules manual, with
the name blanked out.  Really 'no-name' ;-).  Look into any book about the 
hardware of the VGA: Everything is 8 bits wide!  Bit masks, plane latches, etc.

I would like to see your tests.

Bill
-- 
Bill Marsh, Naval Ocean Systems Center, San Diego, CA
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