Re: 1-way modem


"Time Waster" <bfc@xxxxxxxxxxx> wrote in message
news:exMxj.37019$v57.16852@xxxxxxxxxxx
In article <UlKxj.16768$w94.14542@pd7urf2no>, Calab <myspam@xxxxxx> wrote:
Had the same issue when a modem and COM port shared an IRQ. I only found
out
what the problem was because I had a mouse in the COM port... I'd only
recieve data from the modem if I moved the mouse around.

I really like that theory the best -- because a missing interrupt seems
like it would explain the behavior. I don't see anything else with IRQ4
in /proc/interrupts, but.. didn't those IRQ's get tied to particular
other IRQ's in the olden days. Maybe we're way past that now, and
this is a modern machine. I thought maybe 4 was tied to 9, which on
our box would put it with acpi.

IRQ 2 is used for the IRQs between 9 and 16.

IRQ 3 is used for COM1 (and was also used for COM3)
IRQ 4 is used for COM2 (and was also used for COM4)

As you can see, the conflicts between the COM ports is a real hassle. I
even went to the trouble of cutting traces and adding wires to move modems
to IRQ 7, etc.

That was many moons ago.


.

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