booting and 11/44 via tu58 sim?
ard at p850ug1.demon.co.uk
Tue Jun 21 18:14:56 CDT 2005
> But you normally don't want to connect frame grounds
> (pin 1 on RS-232 cables iirc). You sometimes get an
> amazing amount of current through the cables, even
> enough to melt them.
In a lot of cases -- certainly on DEC machines -- signal ground is
connected to frame ground internally.
If a frame ground interconenction passes enough current to melt the wire,
then you've got significant voltage difference between the 2 machines.
That is a major safety problem if the 2 machines are close enough that
you can touch them. For %deity's sake sort out the wiring before somebody
If the 2 machines are far apart -- like in separate buildings, then you
should really be using some kind of isolated connection (either
transformer isolated or opto isolated) to avoid such problems.
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