MIDIbox

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DCB

===== Digital Communications Bus =====

Prior to MIDI, this was implemented on the Roland Jupiter-8 (some units) and Roland Juno-60

== From Hyperreal: ==

From tmoravan@netcom.comTue May 30 10:16:25 1995\\
Date: Tue, 30 May 1995 03:57:58 -0700 (PDT)\\
From: Tom Moravansky <tmoravan@netcom.com>\\
To: rbcIII <robot@crl.com>\\
Cc: analog <analogue@hyperreal.com>\\
Subject: Re: DCB cable pinouts\\

Some folks have asked about the Roland DCB pinouts.  Here is what I have from
the Jupiter-8 service manual:

DCB Pin Configurations


-----------------------------\\
| 07  06  05  04  03  02  01 |\\
| 14  13  12  11  10  09  08 |\\
-----------------------------\\

   (view from rear panel)



 1 - Busy (receive)\\
 2 - Data (receive)\\
 3 - Clock (receive)\\
 4 - Ground\\
 5 - Busy (transmit)\\
 6 - Data (transmit)\\
 7 - Clock (transmit)\\
 8 - unregistered\\
 9 - VCA lower\\
10 - VCA upper\\
11 - VCF lower\\
12 - VCF upper\\
13 - VCO-2\\
14 - VCO-1\\

There were 2 different shapes of DCB cable and 2 different types.
Early shape was a flat cable used to connect early OP-8 converters to the
Jupiter-8's with the OC-8 interface installed.  This was part # H146

Later cables used the D-sub shell.

Cable # H172 is a uni-directional cable with the signal flow indicated by the
arrow on the connector.  Cable # H172 is wired up like this:

|**Receiver  ** |       **Sender** |
|   1        |        5 |
|   2  |               6 |
|   3    |             7 |
|   4      |           4 |


Cable # H165 is bi-directional.  The manual warns:  "DCB Cable H165 is a 
bi-directional cable in which sent from the TX-terminal on a unit returns to
the RX-terminal on the unit, causing regeneration."  So, if you get regenerated
don't say you weren't warned.

Receiver          Sender
------------------------
   1                5
   2                6
   3                7
   4                4
   5                1
   6                2
   7                3
   8                8
   9                9
  10               10
  11               11
  12               12
  13               13
  14               14

Hope this helps.

  _______________________________________________________________________________

Tom Moravansky                                              tmoravan@netcom.com\\
                             quiet electronics \\
From squishy@bga.comTue Jun 13 12:10:01 1995\\
Date: Tue, 13 Jun 1995 14:04:59 -0500\\
From: Drum Machine Wanker <squishy@bga.com>\\
To: analogue@hyperreal.com\\
Subject: Re: MD-8/DCB (pinout info)\\

I've done the unthinkable (for me), i've opened my DCB cable
to finally find out the truth on the pinout.  I tried building
one awhile back without success, I now know why.

If you want to build your own, you'll need a piece of 15 
conductor cable, 14 wires and 1 ground.  The ground is
what I screwed up.  You'll also need two Centronics 14
conductor connections.

The pinout...

The ground is connected to the front housing snap-in 
piece.  Positions 8-14 are wired 1 to 1, that's the 
bottom row.  

Below you'll see the pinout for the top row, positions
1-7.  

|p        |          p|
|o       |           o|
|s      |            s |
|i     |             i|
|t    |              t|
|i   |               i|
|o  |                o|
|n |                 n|
|||
|1 wire 1     |      1 wire 5|
|||
|2 wire 2     |      2 wire 6|
|||
|3 wire 3    |       3 wire 7|
|||
|4 wire 4    |       4 wire 4|
|||
|5 wire 5    |       5 wire 1|
|||
|6 wire 6 |          6 wire 2|
|||
|7 wire 7    |       7 wire 3|

Hope this helps.

Vince.\\
Squishy Records

From tmoravan@netcom.comWed Jun 14 11:49:55 1995\\
Date: Wed, 14 Jun 1995 04:34:38 -0700 (PDT)\\
From: Tom Moravansky <tmoravan@netcom.com>\\
To: MARSHALLR@opsusa.sms.siemens.com\\
Cc: analog <analogue@hyperreal.com>\\
Subject: Re: Jupiter8: DCB vs DCIB?\\

> \\
> Well, since there are a couple of open threads regarding Jupiter8/MD8 \\
> questions, I might as well jump in with my own.....\\
> \\
> I have a Jupiter8 that has some sort of factory interface, but I don't think \\
> it is DCB, since it doesn't have the typical 14 pin 'D' connector up near the \\
> "Roland" logo.  Rather it has a 20 pin IDC ribbon connector w/ a slide switch \\
> down low, near the serial plate.  Could this be the earlier version of DCB, \\
> known as DCIB, and can I use the MD8 or PRO4 DCB interface with it?\\
> \\
> Any Roland/Jupiter experts have a clue?\\
> \\
Well - I can't find my original DCB post, so I hope someone archived it at
the analogue site.  Basically, it sounds like you have the Jupiter-8 version
with the OC-8 DCB retrofit.  The earliest versions used the flat cable
scheme.  The OP-8 (not OP-8M) cv->DCB converter has both types of DCB
connections on it.  After some time, Jupiter-8's were made with the DCB
stuff built in and they switched to the 'classic' d-sub connector.

My post had the pinouts so you could make your own cables.  There were 2
different kinds of cables - one that was only half-wired and provided one-way
communication and the other was fully wired for 2-way traffic.

_______________________________________________________________________________\\
Tom Moravansky                                              tmoravan@netcom.com\\
                             quiet electronics \\

From fEEd@maroon.tc.umn.eduWed Jun 14 13:13:59 1995\\
Date: Wed, 14 Jun 95 14:58:32 CST\\
From: fEEd <fEEd@maroon.tc.umn.edu>\\
To: analogue@hyperreal.com\\
Subject: Re: More DCB/MSQ-700?\\

On Wed, 14 Jun 1995 08:42:46 -0700 (PDT), 
Michael Winton  <mwinton@uclink.berkeley.edu > wrote:

>I know the 700 can send MIDI or DCB out.  I know from reading in the \\
>archives that it cannot "convert" MIDI to DCB.  Can I record a DCB \\
>sequence from my Juno 60 into the MSQ-700 and then play it back, WITH the\\ 
>700 "synced" to the MIDI clock?\\


Sorry, but no.  The bastards.


Rob 

fEEd/>tEMpESt<\http://www.umn.edu/nlhome/m211/feed/<\fEEd@maroon.tc.umn.edu/>

  "FILTER MAINTENANCE- After every 100 hours of operation apply a sine wave  
  to the output of the FILTER to back flush the trapped overtones to unclog 
  your filter."                                            - EML 101 Manual




===== Links: =====

http://www.chd-el.cz/index.php?id=93&lngid=en

http://www.chd-el.cz/index.php?id=312&lngid=en

http://mkv.itm.miun.se/personal/per/diy/DCB/DCB.html