pt@beta.lanl.gov (Paul A. Thiessen) (08/13/89)
Hello. Does anyone know how to successfully use 3 COM ports on a PC? I have
a modem on COM1 (or 2), and a card with two serial ports. I have been unable to
get both serial ports to work with the modem installed, too. Is there some trick
to use? I've tried everything in TFM. The system: 386/25 Phoenix BIOS, Practical
Peripherals 1200 baud modem, Kouwei Electronic Corporation card 2S/P/G.
Is it the serial card that's screwed? Or the setup?
Please let me know if you have any knowledge to share!!!
Thanks!
- Paul
--
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PAUL THIESSEN (Summer only: pt@lanl.gov)
pthiessen@hmcvax.bitnet ...uunet!jarthur!pthiesse
------------------------------------------------------------Howard.Spindel@p8.f14.n105.z1.FIDONET.ORG (Howard Spindel) (08/14/89)
> From: pt@beta.lanl.gov (Paul A. Thiessen) > Date: 12 Aug 89 21:08:08 GMT > Organization: Los Alamos National Laboratory > Message-ID: <30004@beta.lanl.gov> > Newsgroups: comp.sys.ibm.pc > > Hello. Does anyone know how to successfully use 3 COM ports > on a PC? I have > a modem on COM1 (or 2), and a card with two serial ports. I > have been unable to > get both serial ports to work with the modem installed, too. > Is there some trick > to use? I've tried everything in TFM. The system: 386/25 > Phoenix BIOS, Practical > Peripherals 1200 baud modem, Kouwei Electronic Corporation > card 2S/P/G. > Is it the serial card that's screwed? Or the setup? > Please let me know if you have any knowledge to share!!! > You didn't say whether you are using an internal or external modem, but I assume from your description of the problem that it is an internal. If so, the modem uses up one of the assigned i/o address spaces for comm ports. You can get your two serial ports and the modem card to work simultaneously only if you can assign them three separate (non-conflicting) i/o addresses. Check the modem manual to see if you can address the modem as Comm 3 (and then make sure the software you use to drive the modem lets yo u configure for Comm 3). Alternatively, leave the modem as Comm 1 or 2 and see if you can strap the Kouwei board so that one of its ports is Comm 3. If the Kouwei board only allows Comm 1 and 2, and the modem only allows Comm 1 and 2 then you can't use all three ports simultaneously. Caution: a lot of software cannot be configured to use Comm 3, only Comm 1 and 2. You also will start running out of IRQ (interrupt) lines to assign with more than two serial ports. A better solution for you than fooling around with all this might be to buy a cheap external RS-232 switch box. -- Howard Spindel - via FidoNet node 1:105/14 UUCP: ...!{uunet!oresoft, tektronix!reed}!busker!14.8!Howard.Spindel ARPA: Howard.Spindel@p8.f14.n105.z1.FIDONET.ORG
root@nstar.UUCP (Larry Snyder) (08/16/89)
In article <30004@beta.lanl.gov>, pt@beta.lanl.gov (Paul A. Thiessen) writes: > Hello. Does anyone know how to successfully use 3 COM ports on a PC? I have > a modem on COM1 (or 2), and a card with two serial ports. I have been unable to This depends on your software but generally speaking comm port 1 and 3 share IRQ 4 while comms 2 and 4 share IRQ 3. Qmodem for example has an installation where you can select the both the address and interrupt being used for communications. -- Larry Snyder uucp: iuxax!ndcheg!ndmath!nstar!larry The Northern STAR XBBS/Usenet Site 219-287-9020 (VHST) - 219-289-3745 (PEP+)