Thank you Dieter! I was hoping you would respond. This is a great help.
-James

James Husted
Designer, Synthwerks LLC
www.synthwerks.com
james@...
synthwerks@...

On May 2, 2013, at 9:09 AM, yahoo@... wrote:

> 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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