Re: ttya console shut-off causes boot prom (L1-A)

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#3264

From: Craig Dewick
Date: Thu, 28 Nov 1996 00:00

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In <57ikal$dj4@psilocin.gnu.ai.mit.edu> mikc@gnu.ai.mit.edu (Mike Coughlin) writes:

>    From me --  Here is a research project that needs to be carried 
>out. How many Sun computers will the 4.7K resistor work on? The idea is
>that when the terminal is shut off, the resistor will keep the voltage
>on pin 3 from going away. The terminal will turn the voltage on and off 
>like it is supposed to when it is working since the resistor has too
>high a value to stop it. Without the resistor, turning off the terminal
>will cause the voltage on pin 3 to go to zero for a long time, which is 
>what a break signal is.

Just do what I do, and put a null modem adaptor on the serial port, and
use a straight-through cable to connect from that to the terminal
(assuming your terminals are wired DTE, not DCE). That way the handshake
lines all loop back, and it seems to get around the effects of phantom
BREAK's. 

Regards,

Craig.
-- 
        Craig Dewick - craig@zeta.org.au - http://www.zeta.org.au/~craig  
            Professional Train Driver. Located in Sydney, Australia.
          Sun Ripened Kernels - http://www.zeta.org.au/~craig/srk.html
                Surplus and pre-loved Sun Microsystems equipment.

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From: craig@zeta.org.au (Craig Dewick)
Subject: Re: ttya console shut-off causes boot prom (L1-A)
Date: 1996/11/28
Message-ID: <57j0bj$8go@godzilla.zeta.org.au>
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references: <32954874.67DE@oanet.com> <32969234.6EF7@reflections.com.au> <57ikal$dj4@psilocin.gnu.ai.mit.edu>
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