Front panel switches - what did they do?

Eric Smith spacewar at
Tue May 24 15:49:34 CDT 2016

On Tue, May 24, 2016 at 1:49 PM, Brent Hilpert <hilpert at> wrote:
> We were discussing this last year, perhaps I'm being pedantic but I would note that while, as you say, there is commonality of principle in use of induction and the selective weave to represent the data, TROS and core rope (of the sort used in the AGC) also have differences in their principles of operation - they're not just physical variations on each other.

My understanding is that both used drive lines that either went
through the transformer, or around it, to either couple a drive line
to a sense line, or not. In the case of CRM, the wires are essentially
braided with the cores, while in TROS, holes are punched in strips of
flex circuit to break one of the two paths the drive line can take for
each sense position, and the transformer core is a two-part
rectangular thing rather than a little toroid.

If I'm wrong, or missing some fine point distinguishing them, I'd
welcome corrections or additional information.

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