Cool_Tools/td-io
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Thomas Daede 2021-05-26 21:17:40 -07:00
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README.md
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td-io is a JVS I/O board designed to adapt older JAMMA-compatible cabinets to the newer JVS standard, used by modern arcade hardware such as the Naomi and exA. It features a number of independent systems to translate signals, drive cabinet hardware, and power JVS games.
# Features at a glance
* Chainable JVS I/O implementing a 2L12 panel and coin inputs
* JVS to JAMMA video converter compatible with all monitors
* Mono/stereo audio amplifier for driving JAMMA speakers
* JVS power connector providing 3.3V via on-board converter
* High reliability, low heat generation and all solid state caps
* Upgradeable firmware
# Comparison
| | TD-IO | Capcom I/O | Sega 838 | Exa I/O |
| ------------- | ------- | ------------ | ---------- | ------- |
| Lag (frames) | 0 | 1 | 0 | 0 |
| Chaining | ✅ | ✅ | ✅ | ❌ |
| Video | ✅ | ✅ | ✅ | ❌ |
| Audio amp | ✅ | ✅ | ❌ | ❌ |
| 3.3V power | ✅ | ✅ | ❌ | ❌ |
# JVS inputs
The JVS I/O bus connects to the board via USB-style A and B connectors. Daisy chaining is supported. The I/O presents two players, each with a single joystick/lever and six buttons. Joystick and button 1-4 inputs are mapped to the JAMMA edge connector, and buttons 4-6 are mapped to a CPS2-style kick harness connector. Buttons are polled on request, ensuring microsecond-level latency.
The JVS I/O bus connects to the board via USB-style A and B connectors. Daisy chaining is supported. The I/O presents two players, each with a single joystick/lever and six buttons. Joystick and button 1-4 inputs are mapped to the JAMMA edge connector, and buttons 4-6 are mapped to a CPS2-style kick harness connector. Buttons are polled synchronously, ensuring microsecond-level latency.
Service, test, and tilt buttons are also supported. JAMMA's single service button is mapped to JVS player 1's service button.
@ -10,10 +29,12 @@ The board also presents one or two coin slots, toggleable by a DIP switch. The b
# Video
The board amplifies JVS-level video (0.7Vp-p) to JAMMA appropriate levels, by applying a gain of 3. Amplification is DC coupled, so sources that swing negative will also swing negative on the output. Max input and output swing is -3.5 to 3.5V.
The board maps JVS-level video (0.7Vp-p, AC or DC coupled) to JAMMA levels (0-3V, DC coupled). This is achieved via a DC restore step using the sync signal, followed by a fixed amplification. The DC coupled output allows maximum compatibility with monitors such as the Nanao MS8 and capture devices such as the Splitfire which require it.
In addition, a sync combiner combines negative H/V sync to negative composite sync.
No rate conversion is performed - the monitor must support the same scan rates as the JVS game.
An EDID EEPROM is also attached to the VGA port, to identify as a 31kHz monitor.
# Audio
@ -22,7 +43,9 @@ A class-D audio amplifier provides high power speaker drive to the JAMMA edge. I
# Power
An 8-pin JVS power connector forwards 12V and 5V from the cabinet to the JVS board. In addition, an on-board power supply generates 3.3V at up to 8A from the cabinet's 5V rail for systems that require it, such as Naomi.
An 8-pin JVS power connector forwards 12V and 5V from the cabinet to the JVS board. In addition, an on-board power supply generates 3.3V at up to 7A from the cabinet's 5V rail for systems that require it, such as Naomi.
The cabinet's 5V power supply must still be adequate to power the 3.3V converter.
The IO's electronics are protected from overvoltage and overcurrent by an automatically resetting protector.