JVS

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Short Introduction

JVS, or Jamma Video Standard (sometimes even called JAMMA 2), is a specification by a JAMMA special sub-committee consisting of the major arcade game manufacturers. JVS specifies the type of connectors to use for video (HD-15), audio (RCA) and power (JST_VL), in addition to the communications protocol between the game board and the I/O board. In contrast to (old) JAMMA, JVS concentrates I/O functions in a separate board.

A note on the USB connectors

Although USB connectors and cables are used for communication, both the physical signals and the protocol transmitted is completely different and not compatible.

Jvsdiagram.png


I/O Boards

Capcom NAOMI Converter98701 ver1.0

Easy way to identify a version1 from a version2 is to look for the orange components to the right of the test switch. Itdentifies itself as:

No Brand;NAOMI Converter98701;ver1.0

It reports it's capabilities as:

JVS version 2.0
JVS command format revison 1.1
JVS communication system version 1.0
Number of players 2
Number of inputs per player 12 - 6 buttons
Number of coinslots 2
Number of analog input channels 8
                bits pr channel 0

Capcom NAOMI Converter98701 ver2.0

Switch to the right of the test button toggles between 4player/4buttons and 2player/6buttons. For normal games it should be set to 2 player. Identifies itself as:

No Brand;NAOMI Converter98701;ver2.0;


Konami Windy2 I/O Ver 1.0

Identifies itself as:

KONAMI CO.LTD.;Windy2;Ver1.0;Windy2 I/O Ver1.0

Reports it's capabilities as:

JVS version 2.0
JVS command format revison 1.1
JVS communications system version 1.0
Number of players 2
Number of inputs per player 12
Number of coinslots 1

Namco Cyber Lead I/O Boards

There are a few versions of the IO board for the Cyber lead

Cyber Lead Version 1.03

Identifies itself as:

namco ltd.;I/O CYBER LEAD;Ver1.03;JPNLED-0100

Cyber Lead Version 2.02

Identifies itself as:

namco ltd.;I/O CYBER LEAD;Ver2.02;JPNLED-0100

Capabilities is at least:

JVS version 2.0
JVS command format revison 1.1
JVS communucation system version 1.0
Number of players 2
Number of inputs per player 12 - 6 buttons
Number of coinslots 2

Cyber Lead Version 3.0

Identifies itself as:

namco ltd.,;I/O CYBER LEAD;Ver3.0

Namco NAJV2

Found in the Noir cabinet. Not much details on this one. Identifies itself as:

NAJV2;Ver1.00;JPN.Multipurpose

RS Co Ltd Japan - 081202 JAMMA IO

Found in New Delta 32 Cabinets. Identifies itself as:

Global Standard Technology;JAMMA2 I/O 0001;Firmware 0001

Capabilities:

JVS version 3.0
JVS command format revison 1.3
JVS communucation system version 1.0
Number of players 2
Number of inputs per player 13 - 7 buttons 
Number of coinslots 2
Number of analog input channels 8
                bits pr channel 0
Number of general purpose driver outputs 6

Sega 837-13551

Found in the Sega_Naomi_Universal cab.

Identifies itself as:

SEGA ENTERPRISESLTD.;I/O BD JVS;837-13551;Ver1.00;98/10

Capabilities:

JVS version 2.0
JVS command format revison 1.1
JVS communucation system version 1.0
Number of players 2
Number of inputs per player 13 - 7 buttons
Number of coinslots 2
Number of analog input channels 8
                bits pr channel 0
Number of general purpose driver outputs 6

Sega 837-14505

Sega 837-14572

Came with the Lindbergh, it identifies itself as:

SEGA CORPORATION;I/O BD JVS;837-14572;Ver1.00;2005/10

Capabilities:

JVS version 2.0
JVS command format revison 1.3
JVS communucation system version 1.0
Number of players 2
Number of inputs per player 14 - 8 buttons
Number of coinslots 2
Number of analog input channels 8
                bits pr channel 10
Number of general purpose driver outputs 20

Sega 838-13683-93

There is a some confusion as to what this IO board should be called, some refer to it as 'rev.b'.

It identifies itself as

SEGA ENTERPRISES,LTD.;I/O 838-13683B ;Ver1.07;99/06

Kick/Extra buttons

CN3 is a 14-pin JST_NH connector, when jumper JP1 in position B:

  • 5 buttons pr player, all on jamma edge
  • 8 general purpose driver outputs on CN3

Jumper JP1 in position A:

  • No general purpose outputs
  • 9 Buttons pr player, with buttons 6-9 via CN3:
 1 - 5VDC Out
 2 - 5VDC Out
 3 - 5VDC Out
 4 - P1 button 6
 5 - P1 button 7
 6 - P1 button 8
 7 - p1 button 9
 8 - p2 button 6
 9 - p2 button 7
10 - p2 button 8
11 - p2 button 9
12 - GND
13 - GND
14 - GND

Sega 838-13683-02

This is the second IO board with a JAMMA interface Sega made, there is some confusion as to what this is called, but to be precise it's probably best to stick to what the sticker says (838-13683-02). It identifies itself as:

SEGA ENTERPRISES,LTD.;I/O 838-13683D ;Ver1.09;99/11

The operation and pin-out of extra buttons is identical to 838-13683-93, BUT the silkscreen/markings on this version leaves a little to be desired when it comes to clarity. Pin14 is in the top-left corner in the picture below.

Taito JVS-AMP PCB Ver2.00

  • Came with Taito X2 kits, and is tailor made for for use in Egret 3 / Atomiswave SD cabs.
  • Has a built in stereo amplifier
  • Marked 'K91X1025F'
  • Depending on JP2, Header B will function either as input for extra buttons 6-9, or 8 General Outputs. It's a 14 pin JST_NH connector.

Identifies itself as:

TAITO CORP.;JVS-AMP PCB;Ver2.00;2004.08.20

Capabilities:

JVS version 3.0
JVS command format revison 1.3
JVS communucation system version 1.0
Number of players 2
Number of inputs per player 15 + 9 buttons 
Number of coinslots 2
Number of analog input channels 7
                bits pr channel 10

Taito JVS PCB Ver2.00

Installed in original Taito_Vewlix cabinets.

Identifies itself as:

TAITO CORP.;JVS PCB;Ver2.00;2006.08.31

Capabilities:

JVS version 3.0
JVS command format revison 1.3
JVS communucation system version 1.0
Number of players 2
Number of inputs per player 11 - 5 buttons 
Number of coinslots 2
Number of analog input channels 7
                bits pr channel 10
Number of general purpose driver outputs 8

JVS bus detailed mode of operation

JVS consists of 4 signals:

  • RS-485 A
  • RS-485 B
  • SENSE
  • GND

The RS-485 is for data transfer, is shared between all nodes (implying half-duplex) and runs at 115200 baud, while the sense line is point-to-point.


Arcade Hardware Using JVS

Manuals