From:	"Herman Dullink" <dullink AT castel DOT nl>
Newsgroups:	comp.os.msdos.djgpp,comp.os.msdos.programmer,alt.msdos.programmer,alt.games.programming
Subject:	Re: High resolution timer problems..
Date:	Fri, 28 Nov 1997 21:00:35 +0100
Organization:	CasTel Internet
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Message-ID:	<65n8sd$1rm$1@news.castel.nl>
References:	<65m5mt$ka9$1 AT news2 DOT xs4all DOT nl>
NNTP-Posting-Host:	asyncpri21.castel.nl
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

>Can anyone tell me how I could calculate the time it would take to blit a
>full VESA 0x103 screen, using a 486DX2 66 MHz? Is this an easy task, or a
>very difficult one? Do I have to keep in mind:

You determine the time needed doing a couple (let's say 100) of blits,
and divide the time by 'a couple'.

>- Access time of video RAM,
YES, this varies from adapter to adapter

>- Whether real or protected mode is used,
No.

>- other system characteristics?
Type of bus used; ISA, VLB or PCI.

>Would a REP MOVSD loop in protected mode be faster than one in real mode?
No,

I have such a timing program somewhere, stay tuned...

Herman

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