Original from  Don Woodall  to Denis Tonn on 04-20-1998
Original Subject: OS/2 LPT Port Configurat
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DW>       Thought I would try to pick up a thread from about a year
DW> ago that we started and never finished.  Think I got knocked off
DW> the air for a while or something like that.
 Sheesh, and I thought I had managed to slip by you .. 
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 DT> Actually, there are only 3 defined "standards" for LPT ports. 3BC, 
 DT>378, and 278. 3BC was the original IBM MONO/LPT adapter value. Both 
 DT>3BC and 378 were defined to "use" IRQ 7 (although Dos never used the 
 DT>IRQ's). 278 was defined to use IRQ 5. MCA changed this and "shared" 
 DT>IRQ 5 for ports 2 and above, but these "standards" still apply for 
 DT>ISA. I don't know where IRQ 10 comes into the picture. 
DW>       It would be nice to have 3, or more?, parallel ports and to
DW> have them all interrupt driven.  Based on what you said, this
DW> means that 3BC could not be used as one of the addresses. 
DW> Flexibility, gotta have FLEXIBILITY.
 You can have all 3 ports, but the way it works is that 378 and 278 
will be IRQ driven (7 and 5) and 3BC will be interrupt driven. Not all
cards that implemented 3BC have the capability to be IRQ driven, so 
this is the defaults they picked. 
 I was not able to do much with locating the source or the author of
print01.sys.. Not enough free time.. 
 
   Denis       
 All opinions are my very own, IBM has no claim upon them
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