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Subjectserial ports

I'm sorry, if this is a newbie question, but:

Why is it impossible for multiple (standard) serial ports (ttyS?) to
use the same IRQs?

If the ports are used one by one (a process opens a port, does smth
with it, closes it), they can be on the same IRQ. But this can't be
done using these IRQ sharing ports at the same time (overrun errors).

If I remember correctly, I once did smth like this when I used DOS.

Is it some hardware limitation or what? When an interrupt occurs,
serial driver could look up which port it was meant for, couldn't it?

Magnus Hiie
Computer Manager
Eesti Ekspress
Tel: +372 6408046
GSM: +372 56 51146

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