DCB switch box

[media at mail1.nai.net]

At 11:18 PM -0500 05/21/98, J. Larry Hendry wrote:
> Hmm... now where did I out the pin out data for my DCB cables.  I'll look
> for it unless someone else has it handy.  I do remember it uses only
> 4 wires I think: TX, RX, busy, and ??.

Ground. (I used the drain wire in the cable I built, but some early Juno
60's have trouble with ground loops -- the revision is in the Juno 60
service docs).

The Juno 60 has a smaller DCB command set than the Jupiter 8 -- it only can
transmit and receive note data.  A full-featured Jupiter 8 cable would
require more conductors.

>And I remember it is not a straight pin to pin wiring.  Since it
>is a bi-directional cables, the TX and RX need to be rolled in the cable so
>the TX and RX on each end are in the correct pin position.

Yes, however if you count all the cables for the Jupiter 8, Juno 60,
OP-8(M), and OC-8 retrofits, Roland made 5 different DCB interconnects: the
H146, H147, H148, H165, and H172.  The first three are ribbon cables.  The
last two are the more popular -- the 165 is birectional and the 172 is
unidirectional.  Luckily, they both used the same 14-pin "Centronics"
connectors.

>Oh and THANKS again to Kevin Lightner for pointing out to me that the
>occasional stray notes from my Roland MD-8 MIDI/DCB converter were caused
>by the small capacitors on the DCB connector.  I've had no problems since I
>removed those.

I wish mine would play something exciting like stray notes -- mine just
sounds like flat MIDI.  At least having a CV input for VCF cutoff is more
elegant than the SysEx required to automate filter sweeps on the Juno 106.

PEACE OUT :)
MARK

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