Hello Dieter,

> The simplest "bus board" is nothing but a 16 pin ribbon cable with several
> female connectors (10 or 16 pin, according to the connectors of the modules)
> which are attached to the bus connectors of each module (instead of the bus
> cable delivered with the module).

We discussed this topic recently at the forum of www.sequencer.de.
( http://www.sequencer.de/synthesizer/viewtopic.php f=13&t=52973&p=545086&hilit=Doepfer#p545086=)

There are two disadvantages of the ribbon cable solution:
1.) if you do not have access to the rearside of the rack, then it will
be quite difficult to insert a new cable to the bus between existing
modules as the buscable will slip back in the rearside of the rack.
For a beauty case it may be acceptable that you have to unmount all
installed modules, but not for larger cases.
2.) you will be in need of pin head sockets with housings like this...:
http://www.access-incc.us/ppidm.jpg
...which has a coding notch at the center. This notch fits with the
coding noses of the module ribbon cables:
http://www.doepfer.de/a100_man/PV16.jpg
This means: there is only one orientation, in which you can insert the
cable. Since the original busboards do not use this coding, there was no
need, that the module ribbon cables are seated in a dedicated orientation.
So with such a kind of bus "board" you have first to plugin the cable
into the bus cable and then in the module.

Florian