A couple years ago, my Apple Laserwriter IIf worked fine on my RedHat 7,8,9 system. Then it broke and i eventually got around to fixing it. Now, i've installed Fedora and CUPS and hope to get it to work again.

Here's what I've done:
1. setserial -a /dev/ttyS0 baud_base 9600
2. chmod 777 /dev/ttyS0
3. Using Redhat's printer-config thing I set up the printer and when that didn't work, went to CUPS' http : / / localhost : 631 and modified the printer port to serial : /dev /ttyS0 ? baud = 9600 + bits = 8 + parity = none + flow = soft (ignore embedded spaces)

The printer does manage to start blinking (indicating that it is seeing something) but i'm getting nothing else.

I went to the Redhat printer-configurator and tried to change the port there. I entered custom device of /dev/ttyS0 (and it didn't work) and I couldn't figure out howto tell it the baud rate, etc.i wanted.

Any troubleshooting hints would be greatly appreciated.

I discovered something interesting. It may be a RedHat serial port config thing. Here's what I did:

I ran Miniterm and was unable to talk to the Apple. I suspected my cabling. I moved the cable to my Windoze box. It talked fine. I moved the cable to ttyS1 and it worked fine with Miniterm. Then i reconfigged CUPS to use ttyS1and it printed ONE document only. Afterwards miniterm wouldn't talk to ttyS1. I rebooted and moved the cable to ttyS0. Then miniterm would talk.

Conclusion: cabling is OK. serial port is somehow getting blind-sided by something else. Probably a redhat thing that came along sometime after v7 or v8.