home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.os.linux
- Path: sparky!uunet!snorkelwacker.mit.edu!thunder.mcrcim.mcgill.edu!sobeco!alawrenc
- From: alawrenc@sobeco.com (a.lawrence)
- Subject: Re: How to run a second modem on COM3, IRQ5
- Reply-To: alawrenc@sobeco.com
- Organization: Lawrence & Assc.
- Date: Thu, 3 Sep 92 23:48:05 GMT
- Message-ID: <1992Sep3.234805.10310@sobeco.com>
- References: <1992Sep2.202602.18765@magnus.acs.ohio-state.edu> <u31b3hs.715505811@cip-s02> <1992Sep3.132617@tiger1.prime.com>
- Lines: 56
-
- In <1992Sep3.132617@tiger1.prime.com> cummings@tiger1.prime.com (Kevin J. Cummings) writes:
-
- >In article <u31b3hs.715505811@cip-s02>, u31b3hs@cip-s02.informatik.rwth-aachen.de (Michael Haardt) writes:
- >> bjones@magnus.acs.ohio-state.edu (William A Jones) writes:
- >> >I just obatined a Gateway Telepath modem from a coworker who decided that he
- >> >didn't want it anymore. So, now I have two high speed modems. But, after
- >> >reading the documentation, I discovered that the Telepath can be configured
- >> >to use any of the 4 COM ports as IRQ5. So, what I was hoping to do is
- >> >keep my current installation (Microsoft Mouse on COM1, IRQ4; modem on
- >> >COM2, IRQ3) and run the Gateway on COM3 (or COM4) using IRQ5. Is this
- >> >possible? If so, what changes (I'm sure there are some) would I need to
- >> >make to the kernel? What else would I have to do to get this to happen?
- >>
- >> I use a usual serial card aat COM3 with IRQ 5 without any problems. I
- >> changed only the interrupt number in the table, somwhere in the kernel
- >> sources (serial.c?) Anyway, that is all you need to do.
- >>
- >> It might be a nice idea to see which device uses which port addresses
- >> and IRQs during boot, having kind of a unique format like:
- >>
- >> ttys? at 0x??? using irq ?
- >>
- >> Btw: I can't find any more free interrupts in the range from 0 to 7,
- >> are there any? Using interrupts from the second irq controller would
- >> mean that I have to solder something :(
-
- IBM PC architecture IRQ usage from the "The Programmer's PC Source Book",
- by Thom Hogan, Microsoft Press, 1988 (There is a 2nd Edition).
-
- Interrupt IRQ Usage Notes:
-
- 0x08 0 Timer PC bios set timers to 18.2x / sec.
- 0x09 1 Keyboard
- 0x0A 2 RESERVE Slave to second 8259 on PC/AT
- 0x0B 3 COM2 / COM4
- 0x0C 4 COM1 / COM3
- 0x0D 5 Disk / Printer Fixed disk on XT, LPT2 on AT
- 0x0E 6 Diskette Floppy Disk Controller
- 0x0F 7 Printer LPT1
-
- 0x70 8 Clock AT Real time clock, XT reserved
- 0x71 9 --- AT Redirected to IRQ2, XT reserved
- 0x72 10 Not Defined AT unused ??, XT reserved
- 0x73 11 Not Defined AT unused ???, XT reserved
- 0x74 12 Not Defined AT unused ???, XT reserved
- 0x75 13 80287 AT co-processor, XT reserved
- 0x76 14 Disk AT Fixed Disk, XT reserved
- 0x77 15 Not Defined AT unsued ???, XT reserved
-
- I hope this helps, Andrew
-
- --
- If any given program runs correctly, it is obsolete.
- =========================================================================
- Andrew Lawrence, Informaticien Conseil | alawrenc@sobeco.com
- 3605 St-Urbain, #1605 | uunet!sobeco!alawrenc
-