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Article #69288Re: Windows and serial ports
From: Chris Davison
Date: Tue, 02 Apr 1996 00:00
Date: Tue, 02 Apr 1996 00:00
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2813 bytes
In article <326084680wnr@roborat.demon.co.uk>, Dave Scott <dave@roborat.demon.co.uk> writes >In article: <0t3zZAAIadSxEw5b@maclad.demon.co.uk> Alan MacLeod ><alan@maclad.demon.co.uk> writes: >> >> A common problem, but it's only because of the way msd reports the coms >> ports. > >This reminds me of my problem several months back. After fitting a new >16550 I/O card (COM 1&2), together with a 2ndary standard card (COM 3&4) >I found MSD variously reporting between 2 and 4 ports fitted. > >DOS programs worked regardless - Windows (3.1) apps got completely >screwed. The only thing which stopped me returning the card as faulty >was the fact that a cold reboot _always_ gave all 4 ports. > >The problem turned out to be an AMI BIOS bug. Upon a warm-reboot (i.e. >a ctrl-alt-del) the BIOS would not recognise the 16550 ports if the >FIFO buffers had been left enabled (and of course a cold-reboot >always reset the hardware and so turned them off). Hence if I ran >any software which did not turn the buffers back off again after >it finished, the next warm-reboot lost the port that had been used. > >I fix the problem by running a small utility in autoexec, which pokes >the port addresses (3F8, 2F8 etc) into the appropriate BIOS data area >(0040:0000 - 0040:0006). There are similar utilities in the SimTel >archive ISTR. > >> It has been suggested that msd software was written by someone at >> Microsoft in their lunch hour. I think it was written on a Friday >> afternoon after the programmer(?) had been down to the pub :) > >I prefer to think of M$ programmers as being on harder drugs than >alcohol - probably hallucinatory in nature :) > I too have a funny with serial ports and MSD. I have a Dan Technology 486SX with serial mouse on Com1, Com2 cable to down load from a NC100 notebook and Com4 used for a Zoom 34I fax-modem (with 16650chip). All appears to work well BUT MSD says I have Com1, Com2 & Com3 Does anyone have any ideas? -- Chris Davison tel/fax: (01372) 46 26 73 Technology Marketing 7 Littlemead e-mail chris@cdavison.demon.co.uk ESHER C.Davison@kingston.ac.uk Surrey KT10 9PE
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1036bc,496d92738e12d29b X-Google-Attributes: gid1036bc,public From: Chris Davison <chris@cdavison.demon.co.uk> Subject: Re: Windows and serial ports Date: 1996/04/02 Message-ID: <FPmxqHAGuPYxEwNO@cdavison.demon.co.uk> X-Deja-AN: 145565413 distribution: world x-nntp-posting-host: cdavison.demon.co.uk references: <824463144snz@lgab.demon.co.uk> <824655211snz@ambo.demon.co.uk> organization: Technology Marketing mime-version: 1.0 newsgroups: demon.tech.pc