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From: toma@tekgvs.UUCP
Newsgroups: net.micro.pc
Subject: Re: NANSI.SYS snows PC-AT
Message-ID: <1631@tekgvs.UUCP>
Date: Fri, 18-Jul-86 16:25:05 EDT
Article-I.D.: tekgvs.1631
Posted: Fri Jul 18 16:25:05 1986
Date-Received: Sun, 20-Jul-86 07:43:40 EDT
References: <15200027@hpcvlo.UUCP>
Reply-To: toma@tekgvs.UUCP (Thomas Almy)
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 25

In article <15200027@hpcvlo.UUCP> bill@hp-pcd.UUCP writes:
>
>
>
>You may be wasting your time if you're NOT using NANSI.SYS, but you may
>become snow-blind if you DO use it!  It works well on slower machines,
>but NANSI.SYS causes display snow (i.e., short little horizontal white
>lines scattered all over the screen during display write operations)
>on my PC-AT with CGA.  [...]
>
>I suggest that whoever is responsible for updating NANSI.SYS take a good
>look at the way they've written their character output code.  When that
>retrace interval comes along, you've got to get that character shipped
>out IMMEDIATELY -- time is very tight!  Are you listening?
>
I didn't write it but I did look at the code.  It doesn't check for retrace!
It works fine on my systems (PCAT with EGA and a Tandy 1000) which have a
properly designed display controller, but it will be bad news with real
IBM CGAs.

On the other hand, I get irritated by software which flashes the display
(and runs slower) to behave on the CGA!

Tom Almy
Tektronix, Inc.