Re: Change COM port
billurie_at_nospam.org
Date: 01/14/05
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Date: Fri, 14 Jan 2005 10:45:01 -0500
Mike, other readers and of course I, do appreciate the complete
historical account of the COM ports. I remember the days going
back to DOS 6.22, when in connecting up a modem, it had to
be set, and sometimes jumpered, for appropriate COM port.
I interpret your advice to be saying that COM3 is assigned to the modem,
and the FAX software should find it automatically. Unfortunately,
HotFax does not come with a manual and their on-board Help doesn't
provide a way to solve the problem. I'm waiting for help from them
now.
It isn't impossible that some sort of anti-virus or firewall is
really what the problem is, but I've tried it with everything that
I can turn off, disabled, to no avail. So I'm on hold for now.
Thanks for your help.
WBL
Mike Hall wrote:
> Bill
>
> Traditionally, COM 1 was indeed the 'mouse' port.. serial mice worked better
> on COM 1 than COM 2, sometimes because COM 2 was of the 25 pin D type (not
> always though.. it is not unusual to see two 9 pin connections), and mice
> were 9 pin.. also, external modems of the day (they still are) were fitted
> with 25 pin D type connectors.. other devices could also be connected to COM
> 2, serial printers etc.. Direct Cable Connection also brought about a use
> for the 25 pin serial port known as COM 2.. but that was then and this is
> now.. serial port connections for most home users are a thing of the past,
> at least the physical ports found on the back of most computers.. they are
> there mainly for compatibility with older devices..
>
> The mouse that you have connected is a PS2 mouse, so called because it is
> connected to the (IBM) PS2 port (IRQ 12) allocated for mouse use.. there is
> absolutely no physical connection to COM 1..
>
> Internal modem installation programs select COM 3 for obvious reasons.. it
> is generally the first free COM port after the two physical ports on the
> backplate.. even if there is only one COM port there, the installation will
> attempt to use COM 3.. if COM 3 is in use, it will select the next up..
>
> So your modem is sitting on COM 3, and the Fax/Voice software should either
> automatically find the modem, or you should be able to tell the software
> which modem is in use.. most software of this type scans the COM ports
> looking for a valid modem, finds it on COM 3, and then finalizes set up.. it
> should work..
>
> The fact that COM 1 seems to have a problem could be down to two things at
> least.. the first is that there is a physical problem with it (unlikely), or
> that the operator has attempted to force settings to make a device use COM
> 1.. what you might try doing is removing COM 1 from the configuration,
> rebooting to let XP sort the problem for you..
>
> Even if COM 1 has a problem, the modem and Fax software should work ok..
>
> Re a table of IRQ allocations, I really can't see this of being any help to
> you, especially as XP and modern systems are quite capable of sorting all
> of these things without the any user interference..
>
> IRQ 0 Timer channel 0 (May mean "no interrupt".)
> IRQ 1 Keyboard
> IRQ 2 Cascade for controller 2
> IRQ 3 Serial port 2
> IRQ 4 Serial port 1
> IRQ 5 Parallel port 2, Sound card
> IRQ 6 Floppy diskette
> IRQ 7 Parallel port 1
> IRQ 8 Real-time clock
> IRQ 9 Redirected to IRQ2
> IRQ 10 not assigned
> IRQ 11 not assigned
> IRQ 12 not assigned
> IRQ 13 Math coprocessor
> IRQ 14 Hard disk controller 1
> IRQ 15 Hard disk controller 2
>
>
>
>
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