From: "Richard Adamson" To: opendos AT delorie DOT com Date: Fri, 22 Jun 2001 13:04:47 +0100 MIME-Version: 1.0 Content-type: text/plain; charset=ISO-8859-1 Subject: Re: multitasking gives blank screen In-reply-to: <018201c0fa23$7e90ebc0$5608e289@mpaul> X-mailer: Pegasus Mail for Win32 (v3.12b) Message-Id: <20010622120857.VYKH287.mta2-svc.virgin.net@leo> Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from Quoted-printable to 8bit by delorie.com id IAA24929 Reply-To: opendos AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: opendos AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk On 21 Jun 01, at 4:40, Matthias Paul wrote: > It comes out that C800-DFFF, and E800-EFFF are free, > so you should be able to use them as UMB memory. > > You might also have luck using C600/C680-C7FF, > E600-E7FF, and F660-F7FF, maybe even E000-E5FF > (in case this would really be an unused video BIOS), > however, I would not attempt to use these areas until > everything else has cleared up. > > > So far we know: > > > > EMM386 /EXCLUDE=C000-C800,E000-E7FF,F000-FFFF > > is mandantory, leaving only C800-DFFF for experiments, > > but it could still be used up by some stuff on this machine... > > EMM386 /EXCLUDE=C000-C7FF,E000-E7FF,F000-FFFF > /USE=C800-DFFF,E800-EFFF > > > I just want to make sure, nothing else is in there and we > > load DOS low in case this is kind of a DMA problem. > > > > I hope we will be able to see something changing, > > so we could start to build up the configuration again... > > Richard reported to me, that the behaviour didnīt > change after the configuration changes. My understanding > is that this includes TASKMGR /S as well, is this correct? NO! the task-*switching* has always worked. Initially, I tried with EMM386 with no exclusions, and of course it crashed, but then as a first step in trouble shooting I tried EMM386 /E=C000-FFFF, and its been fine since then. pre-emptive multitasking has never worked in any circumstances. > Please add YEAR2000=OFF to CONFIG.SYS, change > EMM386 to /DPMI=OFF, copy COMMAND.COM into > C:\DRDOS (if it isnīt there already), and change the > SHELL= directive as follows: > > SHELL=C:\DRDOS\COMMAND.COM C:\DRDOS\ /E:512 /P > > Please also try to play with the TASKMGR /F, /V:1, > and /V options, just in case this is a video problem. still nothing > If this still does not work, TASKMGR would prove > to be incompatible with your Compaq 386, unfortunately. I guess thats it then :) thanks *very much*, for all your help. > I would be interested to find out, if you can still switch > tasks when the task switcher is controlled from an > external program, even when the TASKMGR menu > does not show you more than one task. If you like > I can send you a little test tool via private mail. Yes please; if this has not become irrelevant in the light of what I hope I have clarified above about non-multi task-switching? Please send it to the fishy nun address. In any event, I will continue fiddling... -- Richard.