karl@sugar.hackercorp.com (Karl Lehenbauer) (10/25/90)
I just fought through some problems that I thought might be FAS's fault, which turned out to be my fault. If you configure FAS with the usual modem controls, if CTS is not present on your connector, FAS will be polite and not output any data. Forever. This will behave very similarly to a misconfigured interrupt. When you try to output, your task will hang, and a subsequent attempt will make the task immortal (meaning killing it won't make it go away), meaning that the system probably won't be able to unmount one or more devices next time you take it down (which'll be right away since you want to clear the problem) and try it again), meaning you'll have to suffer through some file checks when you bring it back up. I tend to test this stuff from a real straight, sh-based root login, running the program out of /tmp, so if I do hang, usually only /tmp will have to be f-checked. In my case, sometime while jacking around with this stuff I inadvertantly set S67 to 1 on a Telebit TB+, which basically says "Make CTS follow CD." I had the Telebit so wedged I thought I was going to have to open it to look for a reset switch. The T2500 is much cooler in this case because you have the A/B switch and two parameter sets -- it's a bit harder to screw up so thoroughly. -- -- uunet!sugar!karl -- Usenet access: (713) 438-5018