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vt1200/reference/keyboard-mouse/allpinouts-dec-7pin.html
SDD 3fd1e13b2e docs: keyboard/mouse protocol spec — LK401 (LK201 protocol) + VSXXX-AA mouse, sources, MAME lk201 device
Distils public docs into reference/keyboard-mouse/PROTOCOL.md for the level-1
Keyboard (27) / Mouse (26) device tests:
- keyboard: 4800 8N1 RS-423, self-test via FD -> 01 00 00 00 (errors 3D/3E)
- mouse: 4800 8O1 RS-232, self-test via 'T' -> 4-byte report (errors 3D/3E, >=0x20 fatal)
- separate ports: DUART2 A=keyboard, B=mouse (NOT daisy-chained)
MAME already has an LK201 device (src/mame/dec/lk201.cpp/.h) but no DEC mouse.
2026-10-16 11:38:52 +03:00

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<time datetime="1998-03-01 00:00">01 Mar 1998</time> - <em>Nicola Asuni</em></div><div class="post-meta-updated"><svg class="icon icon-wrench" viewBox="0 0 512 512" width="1em" height="1em" fill="currentColor" aria-hidden="true" focusable="false"><path d="M352 320c88.4.0 160-71.6 160-160 0-15.3-2.2-30.1-6.2-44.2-3.1-10.8-16.4-13.2-24.3-5.3l-76.8 76.8c-3 3-7.1 4.7-11.3 4.7H336c-8.8.0-16-7.2-16-16v-57.4c0-4.2 1.7-8.3 4.7-11.3l76.8-76.8c7.9-7.9 5.4-21.2-5.3-24.3C382.1 2.2 367.3.0 352 0 263.6.0 192 71.6 192 160c0 19.1 3.4 37.5 9.5 54.5L19.9 396.1C7.2 408.8.0 426.1.0 444.1.0 481.6 30.4 512 67.9 512c18 0 35.3-7.2 48-19.9L297.5 310.5c17 6.2 35.4 9.5 54.5 9.5zM80 408a24 24 0 110 48 24 24 0 110-48z"/></svg>
Updated: <time datetime="2026-06-29 00:00">29 Jun 2026</time></div></div><p><img src="https://allpinouts.org/img/conn_minidin7f.svg" alt="Mouse / Digitizer DEC 7 pin – mini-DIN-7, female" width="159" height="159" loading="eager" fetchpriority="high">
7 pin mini-DIN female (key in the center) connector at the DEC VAXstations, DECstations and DEC&rsquo;s input adapter cables.</p><p>The 7-pin micro-DIN connector was introduced by Digital Equipment Corporation in the mid-1980s for the VSXXX family of input devices used with VAXstation and DECstation workstations. All three variants — the VSXXX-AA round 3-button ball mouse, the VSXXX-GA rectangular 3-button ball mouse, and the VSXXX-AB digitizer tablet — share the same connector and <abbr title="Recommended Standard 232">RS-232</abbr> serial protocol at 4800 bps (8 data bits, odd parity, 1 stop bit). The host system exposes a 15-pin D-sub port that splits via adapter cable (part 17-02640-01) to an <abbr title="Registered Jack 11">RJ-11</abbr> keyboard socket and this 7-pin mini-DIN mouse/tablet socket.</p><table><thead><tr><th>Pin</th><th>Name</th><th>Direction</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td><abbr title="Ground">GND</abbr></td><td>-</td><td>Common Ground</td></tr><tr><td>2</td><td><abbr title="Receive Data">RxD</abbr></td><td>IN</td><td>Receive Data</td></tr><tr><td>3</td><td><abbr title="Transmit Data">TxD</abbr></td><td>OUT</td><td>Transmit Data</td></tr><tr><td>4</td><td>-12V</td><td>-</td><td>-12V power supply</td></tr><tr><td>5</td><td>+5B</td><td>-</td><td>+5V power supply</td></tr><tr><td>6</td><td>+12V</td><td>-</td><td>+12V power supply</td></tr><tr><td>7</td><td>device available</td><td></td><td>The device shorts this pin to GND to let the host computer notice a plugged-in device</td></tr></tbody></table><h3 id="notes">Notes</h3><p>Pin directions are named from the host perspective (looking at the female socket on the cable). Pin 4 (−12V) is used only by the VSXXX-AA and VSXXX-GA mice; pin 6 (+12V) is used exclusively by the VSXXX-AB digitizer tablet. The connector has a keying post in the centre that prevents mis-insertion.</p><h3 id="signals">Signals</h3><ul><li><strong>GND</strong> — signal and power return; pin 7 is also shorted to this pin inside the device to signal device presence to the host</li><li><strong>RxD</strong> — serial data received by the device from the host (host-to-device); 4800 bps, RS-232 levels</li><li><strong>TxD</strong> — serial data transmitted from the device to the host; mouse sends 3-byte incremental position packets (sync + buttons + sign bits, 7-bit delta-X, 7-bit delta-Y) at up to 55 reports/s; tablet sends 5-byte absolute position packets covering a 0–1023 count range</li><li><strong>−12V</strong> — negative supply for RS-232 signal levels; used by mice (VSXXX-AA and VSXXX-GA); typically −8 V to −13 V at under 20 mA</li><li><strong>+5V</strong> — positive logic supply for mice; +5 V ±5% at up to 150 mA</li><li><strong>+12V</strong> — positive supply used exclusively by the VSXXX-AB digitizer tablet; +12 V <abbr title="Direct Current">DC</abbr> ±10% at 0.3 A; not present or required for mouse variants</li><li><strong>device available</strong> — pulled to GND (pin 1) inside the connected device; the host reads this as a logic signal confirming that a device is plugged in</li></ul><h2 id="references">References</h2><ul><li><a href="https://web-docs.gsi.de/~kraemer/COLLECTION/DEC/DECstation_5000_Kybd-Mouse_Info.txt">DECstation 5000 Keyboard/Mouse Info — cable part 17-02640-01 (GSI Darmstadt)</a></li><li><a href="https://www.manualslib.com/manual/1063011/Dec-Decstation-5000-Model-100-Series.html?page=257">DECstation 5000 Model 100 Hardware Operator&rsquo;s Guide EK-PM32C-OG-003, Table C-2 (ManualsLib)</a></li><li><a href="https://www.manualslib.com/manual/934291/Digital-Equipment-Decstation-5000-Model-200.html?page=214">DECstation 5000 Model 200 Hardware Operator&rsquo;s Guide EK-366AA-OG-002, Table C-2 (ManualsLib)</a></li><li><a href="https://raw.githubusercontent.com/torvalds/linux/master/drivers/input/mouse/vsxxxaa.c">Linux kernel driver vsxxxaa.c — DEC VSXXX-AA/GA mouse and VSXXX-AB tablet (torvalds/linux)</a></li><li><a href="https://archive.org/details/bitsavers_decqbusvcbhnicalManualFeb86_19080378">VCB02 Technical Manual AZ-GLGAB-MN, February 1986 — DEC Q-Bus Video Subsystem (Internet Archive / Bitsavers)</a></li></ul><p><a href="https://allpinouts.org/pinouts/connectors/input_device">Category:Input Device Connectors</a></p><nav class="siblings" aria-label="More in Input Device"><details open><summary>37 pinouts in Input Device</summary><ul><li><a href="https://allpinouts.org/pinouts/connectors/input_device/control-port-commodore-vic20-c64-9-pin/">Control Port Commodore VIC20 / C64 9 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/joystick-apple-iic-9-pin/">Joystick Apple IIc 9 pin</a></li><li><a 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href="https://allpinouts.org/pinouts/connectors/input_device/joystick-msx-9-pin/">Joystick MSX 9 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/joystick-neogeo/">Joystick NeoGeo</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/joystick-pc-gameport/">Joystick PC Gameport</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/joystick-ti-99-4a/">Joystick TI-99/4A</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-amiga-5-pin/">Keyboard Amiga 5 Pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-amiga-6-pin/">Keyboard Amiga 6 Pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-amiga-cd-32-6-pin/">Keyboard Amiga CD-32 6 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-apple-macintosh-rj-11/">Keyboard Apple Macintosh RJ-11</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-att-6300/">Keyboard AT&amp;T 6300</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-atari-mega-ste-tt/">Keyboard Atari MEGA ST(e)/TT</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-pc-5-pin/">Keyboard PC 5 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-pc-ps-2-6-pin/">Keyboard PC PS/2 6 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-sgi-6-pin/">Keyboard SGI 6 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-ti-99-4a/">Keyboard TI-99/4A</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-xt-5-pin/">Keyboard XT 5 pin</a></li><li><span aria-current="page">Mouse / Digitizer DEC 7 pin</span></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-el-pina-m-compa-m571-main-board-8-pin/">Mouse El Pina / M-Compa / M571 main board 8 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-m571-motherboard-8-pin/">Mouse M571 motherboard 8 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-macintosh-9-pin/">Mouse Macintosh 9 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-sgi-model-021-0004-0002/">Mouse SGI (Model 021-0004-0002)</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-joystick-amiga-9-pin/">Mouse/Joystick Amiga 9 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-joystick-atari-9-pin/">Mouse/Joystick Atari 9 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-keyboard-ps-2/">Mouse/Keyboard (PS/2)</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-keyboard-sun-15-pin/">Mouse/Keyboard SUN 15 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/mouse-keyboard-sun-8-pin/">Mouse/Keyboard SUN 8 pin</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/pc-midi-game-port/">PC MIDI + game port</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/sega-master-system-light-phaser-3050/">Sega Master System Light Phaser 3050</a></li><li><a href="https://allpinouts.org/pinouts/connectors/input_device/sony-playstation-controller-port/">Sony Playstation Controller Port</a></li></ul></details></nav><nav class="prev-next-post" aria-label="Input Device navigation"><div class="prev"><a class="prev-next-link" href="https://allpinouts.org/pinouts/connectors/input_device/keyboard-xt-5-pin/"><svg class="icon icon-chevron-left" viewBox="0 0 320 512" width="1em" height="1em" fill="currentColor" aria-hidden="true" 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