On Sat, 18 Jan 2003, Heimo Claasen wrote: > For whatrever reason, the external modem on an installed Linux system > was to move from a earlier connection on COM2 / ttyS1 / 2f8 and IRQ 3 to > COM4 / ttyS3 /2e8 and using IRQ 7; COM3 and COM4 sit on a ISA card > (where almost everything indeed can be jumper-set.) No problem to > adapt the dial-out parameters in the DOS sitting on that same machine, > everything works fine. > > Not so with that Linux install: there seems no way to make it accept > the changed irq - and thus, no modem, no dial-up, no net connection... > > Using > > setserial /dev/ttyS3 irq 7 > would indeed set it right - _apparently_, as > setserial /dev/ttyS3 -G > would duely report the setting. But to no avail, trying to start ppp0 > just wouldn't work. > There's no indication in any one of the existing ppp-related > configuration files which hint to the IRQ setting (or would allow to > change it). > > _ONLY_ work-around is starting X, then using Kppp (after having set > parameters there in _its_ setup), then re-logging in to a console, > where the modem connection then is indeed useable. > > (Answers like how powerful Linux is as long as I leave the modem on > COM2 evidently wouldn't help much to make that modem working. And that > was the bottom line of all answers I got, in a rather long thread. > No-one who would be able to explay why the Kppp dialler indeed can quite > well use the right parameters but the "system" cannot.) > > My last hope is now for some wise advice here, as there are some > listers who still know from solid DOS experience how to get at hardware > settings (and don't think that's something "users", in distinction to > "system administrators", should never get the slightest insight of, not > to speak of access.)
I don't know about the equivalent for Linux, but if you use DOS's DEBUG, you will find the addresses of the COM ports (with the bytes reversed) by entering "d0:400" at the "-"prompt. For example: "F8 03 F8 02 00 00 ...." corresponds to COM1 at 03F8 and COM2 at 02F8, with no COM3... I suppose switching away from the DOS standard IRQ3 shared by COM2/4 and IRQ4 shared by COM1/3, or having two devices using the same IRQ could complicate matters. Boyd Ramsay [EMAIL PROTECTED] To unsubscribe from SURVPC send a message to [EMAIL PROTECTED] with unsubscribe SURVPC in the body of the message. Also, trim this footer from any quoted replies. More info can be found at; http://www.softcon.com/archives/SURVPC.html
