Messages in this thread | | | Date | Tue, 6 Aug 1996 07:18:51 +0100 | From | Baard Johannessen <> | Subject | Re: serial ports |
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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? >
Hmmm... I think I'll leave the answer to THE guru. Find some document called The_Serial_Port, or The.Serial.Port. Its written by a guy called Chris Blom, who known maybe more about PC serial hardware than anyone.
>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?
I dont think you used 2 serial ports on the same IRQ at the same time on any PC :), and you are right it is a hardware limitation, and you are also right, about it beeing possible for the serial driver to look up what port sendt the interrupt, but that would also require a hardware hack on your seral card(s). If you are interrested in serial ports on the PC, I strongly sugest you read the above mentiond document, as it is a deffinet guide to what goes on where, and why!
Best of luck bardj
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