Try full flow control. I know I had a heck of a time, and never really got it
working, the borrowed Beige G3 (I think) I had from Erik Fair... but I do know
that I needed full flow control when using tip from a Solaris/x86 box.

On Thu, 25 Jan 2001, Martijn van Buul wrote:

> Hi.
> 
> Is there any known issue with the serial (RS422) ports of the earlier
> PowerMacs? I don't seem to be able to use either one of the serial ports on 
> my G3. Even with a dread simple loopback, I get no response at all. It seems
> to be *sending* things (There is activity on the TxD line, for I can
> see a LED connected via a Max232 driver happily flashing); I haven't checked
> if it actually transmits sane data. If I feed it with a known-to-be-correct
> 1200 baud stream, it remains quiet. It's not related to the port, both serial
> ports remain quiet (And yes, I disabled the getty on the first serial
> port)
> 
> Any ideas? I used minicom (among others) to check things. The hardware
> is known to be working; it works like a charm under MacOS and *cough*
> Linux..
> 
> -- 
>     Martijn van Buul -  Pino@dohd.org - http://www.stack.nl/~martijnb/
> 	 Geek code: G--  - Visit OuterSpace: mud.stack.nl 3333
>    Kees J. Bot: The sum of CPU power and user brain power is a constant.
>