I discovered that this new computer has its physical serial port at address Ox3F8 but on IRQ 10. I wasn’t sure how to correct this problem so I dug deeper. This is specifically for Slackware Linux but this should apply to other Linux distros because I am using common tools.
With Slackware, I took a look at
/etc/rc.d/rc.serial and noticed that it had a rather complicated auto-configuration setup. So I moved the original file to
rc.serial.org and then put the following into a new file called
setserial /dev/ttyS0 port 0x3f8 irq 10
stty -F /dev/ttyS0 38400
That did the trick. My Yaesu FT-450D has a standard DB-9 serial port connector and I have that connected to the serial port in my HP EliteDesk 705 SFF. fldigi and flrig work nicely.
Don’t forget to
chmod -x rc.serial.org and
chmod +x rc.serial.