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<div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:DCB_interface.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/dc/DCB_interface.jpg/220px-DCB_interface.jpg" decoding="async" width="220" height="134" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/dc/DCB_interface.jpg/330px-DCB_interface.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/dc/DCB_interface.jpg/440px-DCB_interface.jpg 2x" data-file-width="4494" data-file-height="2742" /></a><figcaption>DCB Interface</figcaption></figure> <p><b>DCB</b> (<b>Digital Control Bus</b>, <b>Digital Connection Bus</b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> or <b>Digital Communication Bus</b><sup id="cite_ref-russ_2-0" class="reference"><a href="#cite_note-russ-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-ikutaro_3-0" class="reference"><a href="#cite_note-ikutaro-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> in some sources) was a proprietary <a href="/wiki/Data_exchange" title="Data exchange">data interchange</a> interface by <a href="/wiki/Roland_Corporation" title="Roland Corporation">Roland Corporation</a>, developed in 1981<sup id="cite_ref-ikutaro_3-1" class="reference"><a href="#cite_note-ikutaro-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> and introduced in 1982 in their <a href="/wiki/Roland_Juno-60" title="Roland Juno-60">Roland Juno-60</a> and <a href="/wiki/Roland_Jupiter-8" title="Roland Jupiter-8">Roland Jupiter-8</a> products.<sup id="cite_ref-ikutaro_3-2" class="reference"><a href="#cite_note-ikutaro-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> DCB functions were basically the same as <a href="/wiki/MIDI" title="MIDI">MIDI</a>, but unlike MIDI (which is capable of transmitting a wide array of information), DCB could provide note on/off, program change and VCF/VCA control only. DCB-to-MIDI adapters were produced for a number of early Roland products. The DCB interface was made in 2 variants, the earlier one used 20-pin sockets and cables, later switching to the 14-pin Amphenol DDK connector vaguely resembling a <a href="/wiki/IEEE_1284" title="IEEE 1284">parallel port</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Supporting_equipment">Supporting equipment</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=1" title="Edit section: Supporting equipment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:DCB_USB_Adapter.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7b/DCB_USB_Adapter.jpg/220px-DCB_USB_Adapter.jpg" decoding="async" width="220" height="185" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7b/DCB_USB_Adapter.jpg/330px-DCB_USB_Adapter.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7b/DCB_USB_Adapter.jpg/440px-DCB_USB_Adapter.jpg 2x" data-file-width="1024" data-file-height="863" /></a><figcaption>USB MIDI DCB adapter created by Valpower</figcaption></figure> <p>DCB was quickly replaced by MIDI in the early 1980s which Roland helped co-develop with Sequential Circuits.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The only DCB-equipped instruments produced were the Roland <a href="/wiki/Roland_Jupiter-8" title="Roland Jupiter-8">Jupiter-8</a> and <a href="/wiki/Roland_Juno-60" title="Roland Juno-60">JUNO-60</a>;<sup id="cite_ref-russ_2-1" class="reference"><a href="#cite_note-russ-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Roland produced at least two DCB sequencers, the <a href="/w/index.php?title=Roland_JSQ-60&action=edit&redlink=1" class="new" title="Roland JSQ-60 (page does not exist)">JSQ-60</a> and the <a href="/w/index.php?title=Roland_MSQ-700&action=edit&redlink=1" class="new" title="Roland MSQ-700 (page does not exist)">MSQ-700</a>. The latter was capable of saving eight sequences, or a total of 3000 notes, and was capable of transmitting and receiving data via MIDI (though it could not convert signals between DCB and MIDI, nor could it use both protocols simultaneously). Roland later released the MD-8,<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> a rather large black box capable of converting MIDI signals to DCB and <i>vice versa</i>. While this allows note on/off to be sent to a JUNO-60 by MIDI, the solution pales in comparison to the full MIDI implementation on the JUNO-60's successor, the <a href="/wiki/Roland_Juno-106" title="Roland Juno-106">Roland Juno-106</a>. A few other companies offer similar conversion boxes to connect DCB instruments to regular MIDI systems for the support of vintage synthesizers in modern sound production environments; one of the more fully-featured devices being the Kenton PRO-DCB Mk3 which has some bi-directional control limited to a few parameters.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Implementation">Implementation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=2" title="Edit section: Implementation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Following information comes from the Roland JUNO-60 Service Notes, First Edition, page 17–19. </p> <div class="mw-heading mw-heading3"><h3 id="Physical_connection">Physical connection</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=3" title="Edit section: Physical connection"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>DCB uses a special 14-wire connection. The first 7 consist of 3 wires in each direction plus a shared ground. The signals are standard TTL 0-5V, except the Rx Busy output, which is an open collector pulldown. </p><p>1. Rx Busy 2. Rx Data 3. Rx Clock 4. Ground 5. Tx Busy 6. Tx Data 7. Tx Clock </p><p>The remaining 7 wires may be used for special purposes. </p><p>8. Unreg 9. VCA Lower 10. VCA Upper 11. VCF Lower 12. VCF upper 13. VCO-2 14. VCO-1 </p><p>These are not used in the JUNO-60. </p> <div class="mw-heading mw-heading4"><h4 id="Pinout">Pinout</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=4" title="Edit section: Pinout"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>View from rear panel. Amphenol DDK connector. </p> <pre>7 6 5 4 3 2 1 14 13 12 11 10 9 8 </pre> <div class="mw-heading mw-heading3"><h3 id="Serial_data">Serial data</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=5" title="Edit section: Serial data"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The DCB is a standard asynchronous serial stream (using an 8251A IC in the JUNO-60), LSB first, 8 data bits, 2 stop bits, odd parity, and a Baud rate of 31.25 kHz. </p> <div class="mw-heading mw-heading3"><h3 id="Message_(Block)_Structure"><span id="Message_.28Block.29_Structure"></span>Message (Block) Structure</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=6" title="Edit section: Message (Block) Structure"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>DCB data is sent in short blocks messages consisting of an identifier, one or more data codes, and an end mark. Blocks may be sent intermittently (JP-8, OP-8) or continuously (JUNO-60), in which case end marks are not used. </p> <table class="wikitable"> <tbody><tr> <th>Identifier/start</th> <th>Data</th> <th>Data</th> <th>...</th> <th>End </th></tr> <tr> <td>F1-FE</td> <td>0-F0</td> <td>0-F0</td> <td>...</td> <td>FF </td></tr></tbody></table> <p>Identifier is 1 byte using a value F1 through FE, which acts as both a start marker and a message type. Data which follows must not use these data bytes. In practice only FD (patch code) and FE (key code) are used. </p><p>Data codes are one or more sections or channels, each one byte. The number of bytes or channels depends on the transmitter's configuration, but doesn't change once communication has been started. All data values must be in the range 00-F0. </p><p>The end mark is an FF character. It is omitted if the message has a predefined length or the next message starts immediately after the data. </p> <div class="mw-heading mw-heading3"><h3 id="FD:_Patch_Code_Block">FD: Patch Code Block</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=7" title="Edit section: FD: Patch Code Block"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This message identifies a patch, by a single byte. JUNO-60 ignores this. It is sent once after a patch change, with the first key code by OP-8 and JP-8. It does not have an end mark. </p> <div class="mw-heading mw-heading3"><h3 id="FE:_Key_Code">FE: Key Code</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=8" title="Edit section: FE: Key Code"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This message identifies a key event. It contains one byte for each note channel the transmitter supports - so it is 8 bytes long for JP-8 and OP-8, or 6 bytes for JUNO-60. Each channel byte defines a key number (bits 0–6) and whether the key is gated on (1) or off (bit 7). Keys are identified with 0–96 with zero meaning C0 (16.4 Hz), up to 96 C8 (4205 Hz). Channels are assigned in the order defined by the transmitter's key assign mode. For OP-8, this is Ch1 - Ch8. For JP-8 split mode, Upper 4 keys followed by Lower 4 keys. JP-8 dual mode, the data for the first 4 channels is duplicated to the second 4. </p><p>If the JUNO-60 receives more channels than it physically has voices, the extra channels are "queued" and played later when possible. Whereas the JP-8 only accepts 8 channels. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Digital_Control_Bus&action=edit&section=9" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFJenkins2007" class="citation book cs1">Jenkins, Mark (2007). <span class="id-lock-limited" title="Free access subject to limited trial, subscription normally required"><a rel="nofollow" class="external text" href="https://archive.org/details/analogsynthesize00jenk"><i>Analog Synthesizers: Understanding, Performing, Buying</i></a></span>. Amsterdam; Boston; London: Elsevier/Focal Press. p. <a rel="nofollow" class="external text" href="https://archive.org/details/analogsynthesize00jenk/page/n105">91</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-240-52072-8" title="Special:BookSources/978-0-240-52072-8"><bdi>978-0-240-52072-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Analog+Synthesizers%3A+Understanding%2C+Performing%2C+Buying&rft.place=Amsterdam%3B+Boston%3B+London&rft.pages=91&rft.pub=Elsevier%2FFocal+Press&rft.date=2007&rft.isbn=978-0-240-52072-8&rft.aulast=Jenkins&rft.aufirst=Mark&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fanalogsynthesize00jenk&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADigital+Control+Bus" class="Z3988"></span></span> </li> <li id="cite_note-russ-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-russ_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-russ_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRuss1996" class="citation book cs1">Russ, Martin (1996). <i>Sound Synthesis and Sampling</i>. Focal Press. p. 193. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-240-51429-1" title="Special:BookSources/978-0-240-51429-1"><bdi>978-0-240-51429-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Sound+Synthesis+and+Sampling&rft.pages=193&rft.pub=Focal+Press&rft.date=1996&rft.isbn=978-0-240-51429-1&rft.aulast=Russ&rft.aufirst=Martin&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADigital+Control+Bus" class="Z3988"></span></span> </li> <li id="cite_note-ikutaro-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-ikutaro_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-ikutaro_3-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-ikutaro_3-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKakehashiOlsen,_Robert2002" class="citation book cs1">Kakehashi, Ikutarō; Olsen, Robert (2002). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/ibelieveinmusicl00kake"><i>I Believe in Music: Life Experiences and Thoughts on the Future of Electronic Music by the Founder of the Roland Corporation</i></a></span>. Hal Leonard Corporation. p. <a rel="nofollow" class="external text" href="https://archive.org/details/ibelieveinmusicl00kake/page/n232">197</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-634-03783-2" title="Special:BookSources/978-0-634-03783-2"><bdi>978-0-634-03783-2</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=I+Believe+in+Music%3A+Life+Experiences+and+Thoughts+on+the+Future+of+Electronic+Music+by+the+Founder+of+the+Roland+Corporation&rft.pages=197&rft.pub=Hal+Leonard+Corporation&rft.date=2002&rft.isbn=978-0-634-03783-2&rft.aulast=Kakehashi&rft.aufirst=Ikutar%C5%8D&rft.au=Olsen%2C+Robert&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fibelieveinmusicl00kake&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADigital+Control+Bus" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20200405161144/https://www.midi.org/articles-old/midi-history-chapter-6-midi-is-born-1980-1983">"MIDI History:Chapter 6-MIDI is Born 1980-1983"</a>. Archived from <a rel="nofollow" class="external text" href="https://www.midi.org/midi-articles/midi-history-chapter-6-midi-is-born-1980-1983">the original</a> on 2020-04-05<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-05-24</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=MIDI+History%3AChapter+6-MIDI+is+Born+1980-1983&rft_id=https%3A%2F%2Fwww.midi.org%2Fmidi-articles%2Fmidi-history-chapter-6-midi-is-born-1980-1983&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADigital+Control+Bus" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://archive.org/details/synthmanual-roland-md-8-owners-manual">"Roland MD-8 Owner's Manual"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Roland+MD-8+Owner%27s+Manual&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fsynthmanual-roland-md-8-owners-manual&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADigital+Control+Bus" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://kentonuk.com/product/pro-dcb-mk3/">"PRO-DCB Mk3"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=PRO-DCB+Mk3&rft_id=https%3A%2F%2Fkentonuk.com%2Fproduct%2Fpro-dcb-mk3%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADigital+Control+Bus" class="Z3988"></span></span> </li> </ol></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Digital_Control_Bus&oldid=1248109545">https://en.wikipedia.org/w/index.php?title=Digital_Control_Bus&oldid=1248109545</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Electronic_musical_instruments" title="Category:Electronic musical instruments">Electronic musical instruments</a></li><li><a href="/wiki/Category:Computer_buses" title="Category:Computer buses">Computer buses</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 27 September 2024, at 18:08<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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