[rescue] RS6k serial console tips?

r.stricklin bear at typewritten.org
Fri Apr 9 00:51:04 CDT 2004

On Apr 8, 2004, at 8:42 PM, Todd Carson wrote:

> Since I don't have the right cable to connect the RS/6000 to my U10 
> sitting right beneath it, I'm using a Mac Classic with Kermit. They're 
> connected with a Sun-branded DB-25 to MiniDIN-8 cable ande a Radio 
> Shack "null modem adapter". I'm assuming the cable and terminal 
> settings (9600 8N1, DTR handshaking) are okay since I was able to use 
> the kernel debugger. Maybe this is a bad assumption to make, I don't 
> know.

The problem is that the tty driver expects hardware flow control to 
work so it can detect when a terminal is or is not attached. The kernel 
debugger doesn't bother with such formalities.

Actually, that isn't the problem so much as the Sun serial port has a 
different pinout from the one on your Mac, and the corresponding fact 
that your dtr/dsr/cd lines are thereby h0z4r3d. Don't use the Sun cable 
unless you don't want handshaking to work.


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