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- Path: news.enterprise.net!usenet
- From: pfletch@compcoun.idiscover.co.uk (Peter Fletcher)
- Newsgroups: alt.sys.pc-clone.gateway2000,comp.sys.ibm.pc.hardware.comm,comp.dcom.modems
- Subject: Re: Plug and Play 28.8 USR Sportster?
- Date: 6 Apr 1996 22:00:59 GMT
- Organization: Computer Counselors, Inc.
- Message-ID: <4k6pir$8n@news.enterprise.net>
- References: <4jgljl$9d1@mrnews.mro.dec.com> <4josso$l1a@mrnews.mro.dec.com> <4k2tid$b7l@news.megalink.net>
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- In article <4k2tid$b7l@news.megalink.net>, scharles@megalink.net says...
- >
- >I have the EXACT same motherboard AND the Microfirmware PnP BIOS
- >upgrade that you have!! I tried the PnP OPTION for the Sportster (The
- >PnP Version can EITHER be PnP (Take off all the Jumpers) OR you can
- >set it up the old fashion way with setting the Jumpers and IRQ. Well
- >of course I tried PnP...DID NOT WORK!!! The modem and the mouse (I had
- >my mouse on COM1...I don't the ps/2 mouse port on my JX-30G). I
- >worked on it for s long time...but the PnP did work (At one point the
- >modem worked but I had to keep the mouse moving for the data to pass
- >through the modem...weird!! Anyway..I ran the Com POrt program that
- >came with the sportster, it said set you modem on COM3 IRQ5...I put
- >the jumpers on and I was back in business!! No Problems since...LOVE
- >the modem!! Good luck
- >
-
- If you already have (motherboard) devices on COM1 and COM2, A PnP BIOS is going
- to have problems finding somewhere to put a third serial device which does not
- cause trouble, unless it is smarter than (it seems) most are. The problem is
- that, by default, COM1 shares IRQ 4 with COM3 and COM2 shares IRQ 3 with COM4.
- If the PnP BIOS simply assigns the modem the next free COM port, with the
- default IRQ, it ends up sharing this with whatever was there first. This is
- legal (which is why the PnP BIOSes allow it, presumably), but frequently
- doesn't work very well! The symptom you describe (having to move the mouse to
- get data through the modem) is classical for a shared IRQ between mouse and
- modem.
-
- The answer, as you found, is to assign a non-default free IRQ to the COM port
- that the modem is to use. As long as any program which has a "need to know"
- knows where the modem is, the non-standard assignment will cause no trouble,
- and the modem will work fine.
-
- Peter Fletcher
-
-