Message-ID: <000801c105ba$c5933760$f108e289@mpaul>
From: "Matthias Paul" <Matthias DOT Paul AT post DOT rwth-aachen DOT de>
To: <opendos AT delorie DOT com>
References: <200107041111 DOT HAA04917 AT delorie DOT com> <000301c10510$8b6ee200$8d08e289 AT mpaul> <2 DOT 07b7 DOT N78P DOT GFZVXK AT belous DOT munic DOT msk DOT su>
Subject: Re: multitasking gives blank screen
Date: Fri, 6 Jul 2001 02:25:00 +0200
Organization: University of Technology, RWTH Aachen, Germany
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Reply-To: opendos AT delorie DOT com

On 2001-07-05, Arkady V. Belousov wrote:

> Oops, how interesting. Does TASKMGR required or not to
> reproduce this behavior? How NewUI mode is implemented
> (i.e. which video mode used)?

Yes, this happens only under TASKMGR.

MFT in TSR mode reports these changes from normal
video mode 3 to NewUI (inside DOSBOOK or EDIT):

40h:49h "video mode" remains 03h
40h:4Ah "number of columns" 0050h
40h:4Ch "regen buffer length" changes from 1000h to 1400h
40h:4Eh "regen buffer start" 0000h
40h:60h "cursor type" 0Eh 0Dh changes to 07h 06h
40h:65h "3x8 setting" 09h
40h:66h "3x9 setting" 30h
40h:84h "screen rows less 1" changes from 18h to 1Dh
40h:85h "character height" 0010h

> If this behavior happens only under TASKMGR and NewUI mode
> doesn't change video mode except font table then this mean
> trouble in TASKMGR only.
> For example, under some reasons it calls mouse drivers
> with wrong aread definition.

Thatīs what it looks like, yes.

 Matthias

-- 

Matthias Paul, Ubierstrasse 28, D-50321 Bruehl, Germany
<mailto:Matthias DOT Paul AT post DOT rwth-aachen DOT de>; <mailto:mpaul AT drdos DOT org>
http://www.uni-bonn.de/~uzs180/mpdokeng.html; http://mpaul.drdos.org