Don Woodall wrote to Will Honea on 04-18-1998
DW>     From experience, the following chart shows how the BIOS
DW> assigns LPT port numbers to the three main parallel port
DW> addresses.
DW>            3 Ports  2 Ports  1 Port
DW>            present  present  present
DW>            -------  -------  -------
DW>   LPT1       3BC      378      278
DW>   LPT2       378      278
DW>   LPT3       278
DW> 
DW> 
DW>     OS/2 assigns IRQ 7 to LPT1 and IRQ 5 to LPT2.
Thanks, Don.  Some where I thought I had seen that the association of
0x278 and IRQ 5 was fixed.  Not real critical, tho.  BTW, what happens
to LPT3?  Does it lose IRQ access, share it, pretend it isn't there, or
what????  What I read here suggests that the IRQ is tied to the
assigned logical port, not a physical port.   HMMM... simple to handle
either way but a good trivia question. 
Will Honea 
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