[rescue] Help with Sun 3/140

Earl D. Baugh Jr. earl at baugh.org
Fri May 25 14:47:43 CDT 2007

> Date: Thu, 24 May 2007 14:25:12 -0400 (EDT)
> From: Ethan O'Toole <ethan at 757tech.net>
> Subject: Re: [rescue] Serial on Sun 3/140
> Hmmmm.
> Turn off hardware and software handshaking. Short pin 2 to 3 on  
> DB25 or
> DB9 serial cable, and see if you can see what you type. This  
> verifies the
> host is working.

Cool trick,  I hadn't ever know of that before.  A paper clip and I  
got confirmation
that the host and cables are working.

> Sun should prob be 9600bps 8/n/1. Try no handshaking at first.

That's what I tried.  Still not getting any response.   I'm still  
getting the POST test
success LED on the board..  Is there anything else that would prevent  
the serial
from producing output on the Sun 3/140?    It did have an on-board B/ 
W video..
Or was there a jumper?  I didn't see any reference to anything along  
these lines
in the FEH.

> Also beware on the PC of COM1/COM2/COM3/COM4 ...

Well, with the shorting experiment I think I confirmed that this is  
set right (the
box only has one serial connection so I'm pretty sure it's COM1...and  
the Windows
hardware list only lists the one serial port.   So don't think this  
is it.

I've tried setting the norm/diag switch to diag, but don't see  
anything on that.

Could this be that the terminal program isn't sending a proper break  


More information about the rescue mailing list