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 ----------------------------- | 7 6 5 4 3 2 1 | | 14 13 12 11 10 9 8 | (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. _______________________________________________________________________________ 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.

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. _______________________________________________________________________________ >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