[sdiy] how to connect a spider to a wasp?

[Steve Ridley]

> someone asked me where to find a cable that connects an EDP
> spider sequencer to a wasp.
> I know EDP used a prop. digital interface, but presumably the
sockets/plugs
> are just multi-pin din type?
> In which case one could easily make such a cable. Problem is I cannot find
> any schemos online for either the wasp or spider. If there are any owners
out
> there who have these items and can let the list know what kind of cable
> connects these two ..it would be very  useful info.
> Particularly I would like to know what the topology of this cable is..ie
> just straight pin to pin connection ..or something more complicated?

The EDP synths used a simple parallel interface, with four bits for the
note in the octave (there's some redundancy here), two bits for the
octave and one pin for carrying the gate.  The connectors used were
7 pin DIN.

As all the pins are used for signal, the ground/screen was carried
on the shell of the connector, so you should wire that through too.
I'm fairly sure the cable was wired pin for pin, although it's fifteen
years since I made mine.  The DIN sockets served as both input
and output, with tristate buffers feeding the sockets.

It should be fairly easy to drive these things off a printer port too.


Steve Ridley