Standard serial/parallel ports for new PC

[James Knott]

Kevin Cozens wrote:

> The board uses a single IRQ like the other boards I've seen. This is 
> different from the old days where the serial and parallel port combo 
> boards could generate different IRQ's. The IRQ issue shouldn't be a 
> problem if the board is compatible with the older I/O chips. I would 
> only expect to need any IRQ's from the board when using the serial port.
> 

That single IRQ per device is an artifact of the poor design of the 
original IBM PC, which used edge triggered interupts, that made it 
difficult for them to share.  All other computers I've worked on used 
level triggered interupts, which could easily be shared.

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