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 \\ To: rbcIII \\ Cc: analog \\ 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 \\ 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 \\ To: MARSHALLR@opsusa.sms.siemens.com\\ Cc: analog \\ 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 \\ To: analogue@hyperreal.com\\ Subject: Re: More DCB/MSQ-700?\\ On Wed, 14 Jun 1995 08:42:46 -0700 (PDT), Michael Winton 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