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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>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