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- Path: in2.uu.net!xenitec!zswamp!zswamp!geoff
- From: geoff@zswamp.UUCP (Geoffrey Welsh)
- Newsgroups: comp.dcom.modems
- Subject: Re: Help! Upgrading 14.4ext -> 28.8int
- Date: Sun, 31 Dec 1995 12:50:04 EST
- Message-ID: <951231.125004.5y5.rnr.w165w@zswamp.UUCP>
- References: <4buqgc$ml7@berlin.infomatch.com>
- Organization: Izot's Swamp
- X-Newsreader: rnr v1.28
-
- kirk@infomatch.com () writes:
- > Currently I have a 14.4 ext. that has been working perfectly attached to
- > my serial controller card with 8250(?) UART. I disabled COM2 on the
- > controller card and configured my new 28.8 int. for COM4 as reccommended.
-
- No need; if COM2 is disabled, configure the modem as COM2,IRQ3. Most sofwtare
- knows about COM3 & COM4, but not all and, often, you have to configure them
- yourself. COM2 is nice & automatic.
-
- > The odd thing is that my modem will dial and connect, but the screen
- > sometimes freezes, and I have to keep pressing enter to view the whole
- > screen. I also keep getting garbage characters on my screen with the
- > actual data. Haven't been able to transfer any files either.
-
- Sounds like it *might* be an interrupt problem. Sometimes disabling a COM
- port on an I/O card doesn't disable its connection to the IRQ line, which can
- cause grief if another device is trying to use that IRQ line. If the card has
- jumpers to set the IRQ, remove the jumper that connects the disabled COM port
- to an IRQ line. If you're forced to select an interrupt (or 'none' didn't
- work), try selecting a different interrupt - preferrably an unused one - for
- the disabled COM port. Finally, if that doesn't work, confgure the modem to
- COM4 as recommended and choose a nonstandard interrupt.
-
- The following are common uses for interrupts, in case you have to look for a
- nonstandard one:
-
- IRQ0: timer (non-configurable)
- IRQ1: keyboard (non-configurable)
- IRQ2: hard drive controller (Tandy 1000); re-routed to IRQ9 on ATs
- IRQ3: COM2
- IRQ4: COM1
- IRQ5: hard drive controller (XT); LPT2 (usually noy used); bus/inport mouse;
- some network cards; some sound cards
- IRQ6: floppy controller
- IRQ7: LPT1 (usually not used); some sound cards
- IRQ8: real time clock
- IRQ9: some video cards
- IRQ10: some CD-ROM adapters
- IRQ11: some SCSI host adapters
- IRQ12: some (PS/2?) mouse
- IRQ13: math coprocessor
- IRQ14: hard drive controller/host adapter (AT)
- IRQ15: not usually used
-
- --
- Geoffrey Welsh, Senior Developer, InSystems Technologies Inc.
- geoff@zswamp.uucp, [xenitec.on.ca|m2xenix.psg.com]!zswamp!geoff
- We can only hope that people will outgrow the need for government
- before the government finishes outgrowing the need for the people.
-