Thread View: comp.sys.ibm.pc.hardware.misc
12 messages
12 total messages
Started by Tony Ramsden
Sat, 01 Mar 1997 00:00
Extra Comm Port connection
Author: Tony Ramsden
Date: Sat, 01 Mar 1997 00:00
Date: Sat, 01 Mar 1997 00:00
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I have an internal modem configured to Comm2 & a serial mouse on Comm1 but I wish to connect another serial device ( Psion link interface ) to the system, at present I'm having to disconnect the modem when I want to use the psion interface but what a bind this is! I'm running Windows95 on an Intel Endevour Motherboard ( with on board serial ports x2 ). Any suggestion will be gratefully accepted. TIA Tony Tony Ramsden at home in Leeds UK
Re: Extra Comm Port connection
Author: Wally Shangle
Date: Sat, 01 Mar 1997 00:00
Date: Sat, 01 Mar 1997 00:00
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Tony Ramsden wrote: > > I have an internal modem configured to Comm2 & a serial mouse on > Comm1 but I wish to connect another serial device ( Psion link > interface ) to the system, at present I'm having to disconnect the > modem when I want to use the psion interface but what a bind this is! > > I'm running Windows95 on an Intel Endevour Motherboard ( with on board > serial ports x2 ). > > Any suggestion will be gratefully accepted. > > TIA > > Tony > > Tony Ramsden at home in Leeds UK There are only 2 interrupts available for the 4 COM ports. My solution is to connect an external modem and any other serial devices to an AB switch box. An internal modem permanently takes the COM2 interrupt and the mouse software will cause problems if you try to use COM3. Just remember, COM1 and COM3 share interrupts as do COM2 and COM4. Good luck
Re: Extra Comm Port connection
Author: Greg Caird
Date: Sun, 02 Mar 1997 00:00
Date: Sun, 02 Mar 1997 00:00
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Windows 95 supports up to 4 comm ports .
Sugest you set modem to com4 with jumpers.
Email me if you get stuck
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Re: Extra Comm Port connection
Author: Michael Salem
Date: Sun, 02 Mar 1997 00:00
Date: Sun, 02 Mar 1997 00:00
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Tony Ramsden writes: "I have an internal modem configured to Comm2 & a serial mouse on "Comm1 but I wish to connect another serial device. "I'm having to disconnect the "modem when I want to use the psion interface but what a bind this is! "Windows 95 The old PC standard was to have COMs 1,2,3,& 4 on different addresses, but with COMs 1&3; and 2&4, sharing an IRQ. As you say, this doesn't allow simulatenous use of COM 1 & 3; and 2 & 4. With sensible software you should be able to have, say, a modem in COM 2 and a Psion interface in COM 4 so long as you don't use them simultaneously. I'm not sure if there are any additional problems in Win95. However, most modern hardware and software supports other IRQs on COM ports. If, say, IRQ 5 is free, if your Psion interface and associated software allows it you could use it as the COM4 IRQ. This involves fiddling inside Win95, of course. HTH, -- Michael Salem
Re: Extra Comm Port connection
Author: sunrise
Date: Mon, 03 Mar 1997 00:00
Date: Mon, 03 Mar 1997 00:00
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Tony, If you are still listening, go to the Knowledge Base and read article q123922 for more details on the com/irq story. Dale Wally Shangle wrote: > > Tony Ramsden wrote: > > > > I have an internal modem configured to Comm2 & a serial mouse on > > Comm1 but I wish to connect another serial device ( Psion link > > interface ) to the system, at present I'm having to disconnect the > > modem when I want to use the psion interface but what a bind this is! > > > > I'm running Windows95 on an Intel Endevour Motherboard ( with on board > > serial ports x2 ). > > > > Any suggestion will be gratefully accepted. > > > > TIA > > > > Tony > > > > Tony Ramsden at home in Leeds UK > > There are only 2 interrupts available for the 4 COM ports. My solution > is to connect an external modem and any other serial devices to an AB > switch box. An internal modem permanently takes the COM2 interrupt and > the mouse software will cause problems if you try to use COM3. Just > remember, COM1 and COM3 share interrupts as do COM2 and COM4. Good luck
Re: Extra Comm Port connection
Author: Richey Ewing
Date: Mon, 03 Mar 1997 00:00
Date: Mon, 03 Mar 1997 00:00
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Yes you can... my modem is on IRQ 5, COM 4....both serial ports COM 1 and COM 2 use IRQ 2 and 4 respectively. -- --------------------------------------------------------------- Richey Ewing richey@main.com Network Management Services http://www.netaddsoftexas.com ---------------------------------------------------------------
Re: Extra Comm Port connection
Author: Ray
Date: Tue, 04 Mar 1997 00:00
Date: Tue, 04 Mar 1997 00:00
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On Sat, 01 Mar 1997 10:18:22 GMT, Tony Ramsden <tony@tram.demon.co.uk> wrote: >I have an internal modem configured to Comm2 & a serial mouse on >Comm1 but I wish to connect another serial device ( Psion link >interface ) to the system, at present I'm having to disconnect the >modem when I want to use the psion interface but what a bind this is! Check the documentation that came with your internal modem. You may be able to set it to use IRQ 5. If you have a sound card, you will have to make sure it isn't already using IRQ 5 or can be set to use something else. Good Luck -- Ray rv10291@goodnet.com
Re: Extra Comm Port connection
Author: Chester W. Seifers
Date: Tue, 04 Mar 1997 00:00
Date: Tue, 04 Mar 1997 00:00
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Wally Shangle <wshangle@novagate.com> wrote: >Tony Ramsden wrote: >> >> I have an internal modem configured to Comm2 & a serial mouse on >> Comm1 but I wish to connect another serial device ( Psion link >> interface ) to the system, at present I'm having to disconnect the >> modem when I want to use the psion interface but what a bind this is! >> >> I'm running Windows95 on an Intel Endevour Motherboard ( with on board >> serial ports x2 ). >> >> Any suggestion will be gratefully accepted. >> >> TIA >> >> Tony >> >> Tony Ramsden at home in Leeds UK > >There are only 2 interrupts available for the 4 COM ports. My solution >is to connect an external modem and any other serial devices to an AB >switch box. An internal modem permanently takes the COM2 interrupt and >the mouse software will cause problems if you try to use COM3. Just >remember, COM1 and COM3 share interrupts as do COM2 and COM4. Good luck > I had an internal sporster modem running on IRQ5 and COM3 on Windows 3.1 for several months. I just went to Windows 95 and decided to use the PNP feature of the modem, so I removed the jumpers and let Windows 95 assign the modem to IRQ3, COM2. I don't know if I could have forced it to IRQ5, COM3 or not. I was also using the mouse on IRQ4, COM1. I found (at least on Windows 3.1) that COM1 and COM3 could be used without a problem as long as each had its own IRQ. Chet
Re: Extra Comm Port connection
Author: Richey Ewing
Date: Tue, 04 Mar 1997 00:00
Date: Tue, 04 Mar 1997 00:00
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Make that: modem COM 4 IRQ 5 external serial COM 1 IRQ 3 external serial COM 2 IRQ 4 You should be able to change these settings by selecting manual settings in the system configuration. -- --------------------------------------------------------------- Richey Ewing richey@main.com Network Management Services http://www.netaddsoftexas.com ---------------------------------------------------------------
Re: Extra Comm Port connection
Author: Jeff
Date: Tue, 04 Mar 1997 00:00
Date: Tue, 04 Mar 1997 00:00
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Chester W. Seifers <cwseis2@pipeline.com> wrote in article <331bb3b7.27297035@news.pipeline.com>... > Wally Shangle <wshangle@novagate.com> wrote: > > >Tony Ramsden wrote: > >> > >> I have an internal modem configured to Comm2 & a serial mouse on > >> Comm1 but I wish to connect another serial device ( Psion link > >> interface ) to the system, at present I'm having to disconnect the > >> modem when I want to use the psion interface but what a bind this is! > >> > >> I'm running Windows95 on an Intel Endevour Motherboard ( with on board > >> serial ports x2 ). > >> > >> Any suggestion will be gratefully accepted. > >> > >> TIA > >> > >> Tony > >> > >> Tony Ramsden at home in Leeds UK > > > >There are only 2 interrupts available for the 4 COM ports. My solution > >is to connect an external modem and any other serial devices to an AB > >switch box. An internal modem permanently takes the COM2 interrupt and > >the mouse software will cause problems if you try to use COM3. Just > >remember, COM1 and COM3 share interrupts as do COM2 and COM4. Good luck > > > <snip> I also have a Sporster running com3 irq5, I use com 2 for my tablet works just fine. > >
Re: Extra Comm Port connection
Author: Andrew Cullen
Date: Mon, 10 Mar 1997 00:00
Date: Mon, 10 Mar 1997 00:00
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> >There are only 2 interrupts available for the 4 COM ports. My solution > >is to connect an external modem and any other serial devices to an AB > >switch box. An internal modem permanently takes the COM2 interrupt and > >the mouse software will cause problems if you try to use COM3. Just > >remember, COM1 and COM3 share interrupts as do COM2 and COM4. Good luck That's not correct. I'm writing this on a Win95 PC with 4 com ports. COM3 has IRQ11 and COM4 IRQ12 - I'm using a 2port 16550 ISA serial card. (IRQ 12 is normally PS2 Mouse interrupt - unused on my PC). For more than two extra ports, get a custom 4 or eight port card and driver - usually shares a single interrupt but card is more $. Works fine all 4 ports at once. Trick I think is to "fool" Win95 by adding 6 comports - you can change IRQ of COM5 and COm6 to 11 or 12 or whatever. Then delete ports 3 and 4 and reboot. Easy. -- Andrew Cullen Cullen Software Development Limited Auckland, New Zealand
Re: Extra Comm Port connection
Author: Michael Salem
Date: Mon, 10 Mar 1997 00:00
Date: Mon, 10 Mar 1997 00:00
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Andrew Cullen writes: "Win95 PC with 4 com ports. COM3 has IRQ11 and "COM4 IRQ12 - I'm using a 2port 16550 ISA serial card. (IRQ 12 is normally "PS2 Mouse interrupt - unused on my PC). "For more than two extra ports, get a custom 4 or eight port card and driver "- usually shares a single "interrupt but card is more $. " "Works fine all 4 ports at once. Trick I think is to "fool" Win95 by adding "6 comports - you can "change IRQ of COM5 and COm6 to 11 or 12 or whatever. Then delete ports 3 "and 4 and reboot. The problem I can anticipate here: if you later have to do "Add hardware", Win95's plug & pray might change the ports back to what they "should" be? I'm far from sure of this; but the sort of problem that bedevils me is a network card (NIC) set to use IRQ 10, set so that Win95 can't change it (jumpered to be software configurable but not p&p). Whenever Win95 adds hardware it likes to allocate IRQ3 to the NIC, which will of course no longer talk to the network. Best wishes, -- Michael Salem
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