12 Apr
2005
12 Apr
'05
7:26 p.m.
On Tue, 12 Apr 2005, Ethan Dicks wrote:
On 4/12/05, Vintage Computer Festival <vcf at
siconic.com> wrote:
I have limited experience with this as I only tried it once, but when I
did I noticed that either one or the other computer was greedy and took
all the bits for itself, and the other computer didn't get any signal, so
I always assumed you needed some sort of "special" cable in order to split
an RS-232 signal.
--
Sellam Ismail Vintage Computer Festival
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I can't remember what the software I used was
called, but I think I still
have it somewhere and can check. It came with a special double-headed
cable though, and unless that cable was just a simple Y-split, I don't
know if making one from scratch would be feasible.
The physical cable used with HP line analysers is a simple Y-split -
25-position ribbon cable, two DB25F and one DB25M (or the other way
round... can't quite remember). You can wedge the cable between two
devices, then attach the free end to the HP pod (or just plug a DB25
cable right from one unit direct to the pod if you are using the HP to
originate or consume bits)
What I'm not sure of is if the HP pod has anything special in the way
of drivers/receivers to keep from loading the line as it monitors
things. I could open up a pod and see what's inside...