Table of Contents
JVS Encoder Board Connectors
There are a lot of JVS encoder boards out there, but many of them share similar connectors and pinouts.
JVS Boards
Namco Cyber Lead
The pinouts for the Namco Cyber Lead JVS board, and the JAMMA-CONV board, are on the Cyber Lead Pinouts Page.
Sega JVS Encoder 837-13551
This board is the standard encoder for the Naomi Universal Cabinet, and probably others as well. It has analogue and digital inputs, +5V and +12V input/outputs and JVS in and out via the USB-A and USB-B connectors.
- Digital Input (CN3)
- Analogue Input (CN6)
- Power In & Out (CN1, CN2, CN7, CN8)
Sega JVS JAMMA Decoder 838-13683
This board is designed to allow the use of JVS game systems (Naomi, Tri-Force etc) in JAMMA cabinets. It converts the JAMMA digital (and analogue) control panel and cabinet signals to JVS serial data, and converts the VGA-level video to JAMMA levels for the JAMMA monitor. It also includes an in/out connector for cabinets with more than three buttons per player, or for use with digital marquees on cabinets like the VS City.
- Analogue Input (CN7)
- Speaker Input (CN4)
- Input/Output (CN3)
Connectors
Digital Inputs
60-pin Digital Input
This connector is used on several Sega JVS boards. It's a JST RA-series IDC connector with one guide groove.
| Pin | Function | Pin | Function |
|---|---|---|---|
| 2 | +5V | 1 | +5V |
| 4 | +5V | 3 | +5V |
| 6 | +5V | 5 | +5V |
| 8 | +5V | 7 | +5V |
| 10 | GND | 9 | GND |
| 12 | GND | 11 | GND |
| 14 | GND | 13 | GND |
| 16 | N/C | 15 | GND |
| 18 | 2P Start | 17 | 1P Start |
| 20 | 2P Right | 19 | 1P Right |
| 22 | 2P Left | 21 | 1P Left |
| 24 | 2P Up | 23 | 1P Up |
| 26 | 2P Down | 25 | 1P Down |
| 28 | 2P Button 1 | 27 | 1P Button 1 |
| 30 | 2P Button 2 | 29 | 1P Button 2 |
| 32 | 2P Button 3 | 31 | 1P Button 3 |
| 34 | 2P Button 4 | 33 | 1P Button 4 |
| 36 | 2P Button 5 | 35 | 1P Button 5 |
| 38 | 2P Button 6 | 37 | 1P Button 6 |
| 40 | 2P Button 7 | 39 | 1P Button 7 |
| 42 | 2P Service | 41 | 1P Service |
| 44 | Tilt | 43 | Test |
| 46 | Coin 2 | 45 | Coin 1 |
| 48 | N/C | 47 | N/C |
| 50 | Coin Meter 2 | 49 | Coin Meter 1 |
| 52 | Output 2 | 51 | Output 1 |
| 54 | Output 4 | 53 | Output 3 |
| 56 | Output 6 | 55 | Output 5 |
| 58 | +12V | 57 | +12V |
| 60 | +12V | 59 | +12V |
| Source: jammaharness.blogspot.com | |||
Analogue Inputs
26-Pin Analogue Connector
This connector handles the analogue inputs for JVS game systems. There are eight analogue channels, labeled AD0-AD7. It's a JST RA-series IDC connector.
- Label: CN6
| Pin | Function | Pin | Function |
|---|---|---|---|
| 2 | Vcc | 1 | Vcc |
| 4 | AD 4 | 3 | AD 0 |
| 6 | GND | 5 | GND |
| 8 | N/C | 7 | N/C |
| 10 | AD 5 | 9 | AD 1 |
| 12 | N/C | 11 | N/C |
| 14 | N/C | 13 | N/C |
| 16 | AD 6 | 15 | AD 2 |
| 18 | N/C | 17 | N/C |
| 20 | Vcc | 19 | Vcc |
| 22 | AD 7 | 21 | AD 3 |
| 24 | GND | 23 | GND |
| 26 | N/C | 25 | N/C |
| Source: jammaharness.blogspot.com | |||
Output Connectors
20-pin Output Connector
Sega's 837-14572 board has a 20-pin connector for output signals, often used to activate lights. Outputs 1-6 are available on the 60-pin connector, but 7-20 are only available on this 20-pin connector. It's a JST RA-series IDC connector.
- Label: CN9
| Pin | Function | Pin | Function |
|---|---|---|---|
| 2 | +5V | 1 | +5V |
| 4 | GND | 3 | GND |
| 6 | Out 8 | 5 | Out 7 |
| 8 | Out 10 | 7 | Out 9 |
| 10 | Out 12 | 9 | Out 11 |
| 12 | Out 14 | 11 | Out 13 |
| 14 | Out 16 | 13 | Out 15 |
| 16 | Out 18 | 15 | Out 17 |
| 18 | Out 20 | 17 | Out 19 |
| 20 | +12V | 19 | +12V |
| Source: jammaharness.blogspot.com | |||
Power Connectors
The 837-13551 and 837-14572 encoder boards both have a pair of 5V and 12V output connectors. Both connectors can be used for power input or output, so when providing +5V for the board to function, either connector can be used, and the other can provide power to downstream devices.
Both connectors are JST NH-series, the same as normally used for joysticks.
+5V Connectors
- Label: CN7, CN8
| Pin | Function |
|---|---|
| 1 | +5V |
| 2 | +5V |
| 3 | GND |
| 4 | GND |
+12V Connectors
- Label: CN1, CN2
| Pin | Function |
|---|---|
| 1 | +12V |
| 2 | +12V |
| 3 | N/C |
| 4 | GND |
| 4 | GND |
Input & Output Connectors
14 Pin I/O Connector
This connector can be set to either input (for additional buttons) or output (for digital marquees on cabs like the VS City) by changing the jumper marked JP1 to A (input) or B (output).
This is a JST NH-series 14-pin connector.
| Pin | Input | Output | Pin | Input | Output |
|---|---|---|---|---|---|
| 1 | +5V | 8 | 2P Button 4 | Billboard Out 4 | |
| 2 | +5V | 9 | 2P Button 5 | Billboard Out 5 | |
| 3 | +5V | 10 | 2P Button 6 | Billboard Out 6 | |
| 4 | 1P Button 4 | Billboard Out 0 | 11 | 2P Button 7 | Billboard Out 7 |
| 5 | 1P Button 5 | Billboard Out 1 | 12 | GND | |
| 6 | 1P Button 6 | Billboard Out 2 | 13 | GND | |
| 7 | 1P Button 7 | Billboard Out 3 | 14 | GND | |
| Source: Sega JVS Jamma Conversion Manual (Japanese) | |||||
JVS Connectors
JVS uses RS-485 serial signals using USB connectors. It is not USB compatible.
“The JVS I/O physical layer uses RS-485 standard for serial transmission. The physical connection uses USBA and USB-B connectors. The protocol is half-duplex multi-point, so all DATA lines are shared. The Sense line is point-to-point between adjacent nodes, and pull-down. Each device which supports daisy-chaining will have two JVS I/O ports, with the outgoing port being a USB-A connector, and the incoming port being a USB-B connector. The master node will thus only have a USB-A connector, and a slave node without daisy chaining will only have a USB-B connector.” According to the JAMMA Video Standard (JVS) Third Edition by Alex -trap15- Marshall.
⚠️ Caution!
| JVS Signal Pins | ||
|---|---|---|
| Pin | Signal | Colour |
| 1 | Sense | Red |
| 2 | Data - | White |
| 3 | Data + | Green |
| 4 | Ground | Black |
- JAMMA Video Standard (JVS) Third Edition by Alex -trap15- Marshall