LR>                                ... It is customary to set com1 and
 LR> com3 to IRQ  4 and com2 and com4 to IRQ3.  If you want to use two
 LR> serial ports AND a mouse  you'll have to come up with another IRQ. 
 AA> Which raises the question: why did anyone think that more than 2 comm 
 AA> ports would ber USEFUL if they shared irq's like that?
I do use more than 2 comm ports, and comm ports WILL share IRQs provided one 
doesn't try to use both at the same time.  Some more sophisticated hardware 
now  allows setting IRQs to a wide range of values.  If you really need to 
use a bank of COMM ports that's the way to go.  Of course, there's never 
enough IRQs (usually 15) in ANY machine for all the things one might want to 
use; but judicious selection can usually overcome conflicts.
Regards,
Larry 
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