James,

this is the pin-out of the connectors that connect the A-154 to the A-155:

1: A2
2: A1
3: A0
4: Clock
5+6: +12V
7+8: GND
9+10: -12V

This is the arrangement of the pin numbers:

1 2
3 4
5 6
7 8
9 10

Pay attention that the address signals and the clock signal have high level
(0/+12V) because they have to drive CMOS circuits with 12V supply.
The "inhibit" signal is "A3". This signal is not available at the 10 pin
connector. It's a socket at the front panel of the A-154 because the A-155
has no inhibit input (one has to use external VC switches for sequences
longer than 8 steps). The A-155 module was designed in 1997 and at this time
it was planned as a stand-alone unit without the need of an inhibit signal.
The A-154 was released many years later in 2004.

Best wishes
Dieter Doepfer

> -----Ursprungliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von James Husted
> Gesendet: Donnerstag, 2. Mai 2013 17:37
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 decoding the bus on a A-154
>
>
> I am thinking about making some modules and interfaces that will
> connect to and expand from the A-154 Enhanced Sequential
> controller module and need to know what is being transmitted on
> the pins of the ribbon connector that plugs into the A-155. Since
> the A-154 can drive more than one A-155 I assume more than just
> the clock and 3 address lines shown on the block diagram are
> being sent down the ribbon cable. I imagine a inhibit line is
> there too. If anyone can supply me with a pinout of this
> cable/header it would be much appreciated. I could
> reverse-engineer the thing but I haven't gotten my A-154 yet.
>
> I would like to make an interface that would allow controlling a
> pair of our PGM-4x4 Programmer/Sequencers and some future
> Synthwerks modules with a A-154. I would rather connect to the
> A-154 than make a competing module to do the same thing.
> -Thanks in advance!
>
> James Husted
> Designer, Synthwerks LLC
> www.synthwerks.com
> james@...
> synthwerks@...
>
>
>
>
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