Mail Archives: djgpp/2003/01/15/10:00:09
Tonu Aas wrote:
>> > If they use the same IRQ(COM1, COM3 or COM2 COM4) then its normal.
>>
>> No. Just bad software. There are enough status bits on the UART chip
>> to see which one has raised the interrupt. It just slows down a
>> little bite, because you have to ask all possible UART that are
>> sharing the same IRQ.
>
> You expect that UARTS can share IRQ-s.
Yes, because I know it is possible.
> I dont know, but on older machines they dont.
They can. In theory, at least.
> At least ISA bus IO cards dont.
Sure they can, as long as all UARTs are on the same card.
> So its not "Just bad software" but can
> be also bad harware as most PC platform hardware is.
Yes, this might be the case.
> I think that this libnet is some older library and it doesnt handle
> IRQ sharing also.
As I said: Bad software. ;-)
> Only bullet-proof solution is to not use the same IRQ or not to use
> IRQ at all :[
I know.
Vinzent.
--
A student who changes the course of history is probably taking an
exam.
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