Standard serial/parallel ports for new PC

[Lennart Sorensen]

On Mon, Jan 21, 2008 at 11:22:10PM -0500, Kevin Cozens wrote:
> Thanks for mentioning them. I haven't thought about that company in a long 
> time. Being able to deal with a local company would be good as it avoids a 
> lot of cross-border issues.
> 
> The combo board sounds promising and the price is around the prices I've 
> been seeing on some other boards. It is stated as being 16550 compatible on 
> the serial port side. No indication about any hardware compatability on the 
> parallel port side. I'll have to ask them if its 8255 compatible or not.
> 
> 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.

Old boards generated seperate IRQs since ISA didn't do shared IRQs.  New
boards generate one IRQ since PCI does share IRQs.  Much better design
we have now.

--
Len Sorensen
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