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000340_news@newsmaster….columbia.edu _Sat Jun 21 12:34:58 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Problems using Kermit 95 with COM1 and COM3.
Date: 21 Jun 1997 16:34:38 GMT
Organization: Columbia University
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Message-ID: <5ogvqu$btn$1@newsmaster.cc.columbia.edu>
References: <5odrb1$mrv@duke.telepac.pt> <5of0ll$eng$1@newsmaster.cc.columbia.edu> <bhuberEC4EGp.H1@netcom.com>
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In article <bhuberEC4EGp.H1@netcom.com>, Bud Huber <bhuber@netcom.com> wrote:
: In article <5of0ll$eng$1@newsmaster.cc.columbia.edu>,
: Frank da Cruz <fdc@watsun.cc.columbia.edu> wrote:
: >In article <5odrb1$mrv@duke.telepac.pt>,
: >Paul Vieira <cel@mail.telepac.pt> wrote:
: >: I have a PC ( NT 4.0) with 3 serial ports (each one is connected to a
: >: modem). I made 3 scripts (one for each port) in Kermit 95 to receive
: >: files from the outside. The problem is that I can't run the scripts on
: >: COM1 and COM3 at the same time, because one of the modems will not
: >: work (initialize). I think the problem is related with the IRQ's
: >: ( COM1 and COM3 use the same IRQ). How can I resolve this problem?
: >:
: >This is a canned reply to all queries regarding the use of MS-DOS Kermit
: >on Windows 95 and NT, which are coming in at an ever-increasing rate:
:
: But Frank,
:
: The gentleman clearly indicated he was having problems with Kermit 95,
: not Kermit for DOS.
:
Oops. It was a bad day -- after the 20th or so question about why MS-DOS
Kermit did not work for somebody on COM3 or COM4 under Windows 95 or NT,
I started having what they call a "knee jerk reaction" -- sorry.
As Paul Vieira pointed out in his reply to the same posting, you have to
sort out the COM-port configuration in Windows NT. Most PCs today have
more devices than they do interrupts, and so this makes PC configuration
an unenviable task, Plug-n-Play notwithstanding. Personally, I do not feel
that this should have been the architecture for the next century, but there's
not much we can do about that :-)
So yes, see if you can find an interrupt (IRQ) number that is not used by any
other device, and then see if you can configure your COM3 port to use that
interrupt number. And proceed with utmost caution, since a bad choice can
wreak havoc on your computer. Here is a brief and not necessarily
comprehensive guide to PC interrupt numbers from the MS-DOS Kermit "beware
file":
2 Normally available, but some video boards use it to obey an obsolete
standard for indicating vertical refresh. Adjust video board jumpers
to not do this. On 286's and above, IRQ 2 is also known as IRQ 9:
same IRQ, alternate number.
3 Normally COM2 and COM4. PS/2's use IRQ 3 for all serial ports above
COM1. IRQ3 is also a favorite "factory default" of many local area
network (LAN) adapters.
4 Normally COM1 and informally COM3 (except on PS/2s).
5 Secondary parallel port. Parallel ports are rarely interrupt-driven
(except for Novell RPRINTER users) so this IRQ becomes free if you
unjumper it on the parallel port board. LAN adapters are often placed
on IRQ 5. PC/XTs use IRQ 5 for the hard disk. Careful with this one.
6 Floppy disk drives. Leave it alone!
7 Primary parallel port. Remove as described for IRQ 5. Be careful,
LAN adapters are frequently placed here.
IRQs higher than 7 are not available on original PCs or PC/XTs, and also might
not be selectable on the device itself.
9 Alias for IRQ 2 on PC/AT and above. Don't try to use this one
as if it were a unique IRQ.
10 Usually free.
11 Usually free.
12 Used by the IBM bus mouse, otherwise usually free.
13 Math coprocessor errors are trapped here, otherwise frequently free.
14 Used by hard disk on 286 and above. Leave alone!
15 Some SCSI controllers use this. Usually free.
- Frank