Com1/3 and 2/4 share the same irq.  If you want to use them  
simultaneously, you'll need to change the irq they use.  This would  
make them non-standard, but there are programs that can add com 3-4 to  
your bios port table area, and thus make them viewable by normal dos  
apps.  I used to have it, but no longer do, although I'm sure a search  
on google will turn up a copy.

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