On Sunday September 28 1997 at 17:35, Frank Sexton wrote to Lynn Nash:
 FS> My only point was that virtually everyone (software and hardware folks)
 FS> conform to the COM1 and COM2 address (and IRQ) standards (de facto or
 FS> not).  But that many video card manufacturers do not feel the need to
 FS> adjust their addressing requirements so as not to interfere with the
 FS> operation of COM4.  This can sometimes cause trouble for COM4 users with
 FS> certain video cards.
Many cheap IO boards don't decode all sixteen bits of the port address space: 
the 8514/a ports (which is what the 'com4' things actually are) are at a 
higher address, but the IO boards don't decode the higher bits, so treat them 
as if they where at COM4.
Moving the ports will prevent the cards from being 8514/a compatible.
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