I use a standard I/O card (hard/floppy controller card, 2 COM ports)
[and LPT port] with 2 COM ports configured to COM 1, IRQ 4; COM2, IRQ 3.
I also have a "Twin Com" ('brand name
' I guess) configured as COM 3, IRQ 2; COM4 IRQ 5. This card has been
in use for SEVERAL years, first with a 286, and now with my 486, with
NO problems. The computer(s) (first the 286, and now the 486) are
used in a 3 station MM, with it being the "central" computer, with
ALL FOUR COM PORTS OPERATIONAL (radio control, packet, and one
computer on each end), with NO problems. The card cost me $20 and change.
I believe that COM3 and COM4 are "rerouted" through IRQ 2 to the
higher IRQs. I think there were several messages about that thread a
few weeks ago. When I contest from home, with one radio, with CT 9.XX,
I can use the serial mouse on COM1, packet on COM2, and radio control on
COM3. That way, I can also route packet to a dumb terminal/terminal
program on the computer. My modem is on COM1, and also is switched.
No unplugging/plugging cables! I have never used the Diamond Flower card,
nor any other "4 COM ports on one board
" card. GL Tom, KY2T 6726326@MCI.COM