🚀 go-pugleaf

In article <2pd7kp$oni@harbinger.cc.monash.edu.au>, wfan1@lindblat.cc.monash.edu.au (William Fang) writes:
|> 
|> I'm in need of another serial port or two, as I'm tired of swapping
|> the printer and modem in out all day.  My multifunction I/O card has
|> only two serial ports, and one is a 9 pin mouse port.
|> 
|> I plan to a serial card with socketed uarts, and upgrade one to the 16550,
|> for use with the modem.

  I currently run 6 serial ports under both MS-DOS and OS/2 (initially
2.1, now 2.11).  I supplemented the stock 2 port serial/parallel board
with a 4 port STB 4SIO board.  The 4SIO board allows address selection
to any of 8 port addresses, and conection of any of the ports to any
interrupt, including high interrupts.  I currently operate the four 4SIO
ports on interrupts 9, 10, 12, and 15.

|> I've heard that there can be some problems running 4 serial ports under
|> OS/2, and perhaps with MS-DOS or Windows, with shared interrupts or
|> cascaded interrupts?

  On the ISA bus you should not drive an interrupt line from more than
one card.  This is a limitation in the basic hardware design.  (EISA
and MCA designers fixed this problem.)  However, since the 4SIO ports
are all on one card, and since the card supports shared interrupts, you
can quite successfully configure two, three, or all four to use the
same interrupt.

|> What will I need to buy to suit my needs?

  See above.  The card runs about $110.

|> - Bill

    Bob
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