booting and 11/44 via tu58 sim?

[Tony Duell]

> 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 
gets killed.

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. 

-tony