I know I've been announcing a lot of projects lately, and I'm going to try to have all of these released fairly soon, but I have yet another project to announce today. A while back several members on this forum attempted to make a reproduction of the original Taito JAMMA kit, but for a number of reasons that project seems to have fallen through. I was involved only minimally and the contribution that I made was reproducing the JOINT PCB from the original JAMMA kit. Another component from that project was the Jassifier that @Frank_fjs designed. Since the original project fell through I got to thinking about how I might design a completely new JAMMA interface for the Vewlix that would not have the same design limitations of the original kit. This is what I came up with.
Solder Side:
[/align]The Universal JAMMA Interface is the main element of this design. It handles video and audio attenuation, and collects all of the controls into a convenient 40 pin IDC cable which can connect to a variety of different control panel wiring harnesses using a simple adapter.
Features:
Future adapters will be designed for SEGA JVS cabinets and potentially Namco Noir cabinets if there is enough interest. Prototype PCBS are being made now, so testing should be able to commence in a couple of weeks. Pricing is still up in the air. I'll keep this thread updated when there is more info.
The Universal JAMMA Interface
Parts Side:Solder Side:
Features:
- Power: Power is provided to the JAMMA edge through a pair of JST VL connectors which follow the JVS power supply pinout. There will be a space to attach a Negatron for -5V power.
- Video: RGB video is attenuated and buffered through a THS7374 for safe and proper video output for 75ohm consumer video systems. RGBS can be output by the Genesis 2 style 9 pin Mini DIN connector using standard Genesis SCART cables (this should also work with RAD2x cabels). Alternatively there is an HD-15 port for connecting directly to the OSSC's VGA in. The HD-15 port only outputs RGBS not RGBHV. R G and B levels will be individually adjustable using 3 potentiometers. Some of the resistor values are still up in the air, but the plan is for the pots to only control about 25% of the total attenuation so fine tuning the brightness and color balance will be easier.
- Audio: Audio is attenuated to line level. The JAMMA interface supports Mono and Stereo (MVS) audio input from the JAMMA edge (with a jumper for stereo), as well as switched external stereo input for PCBs that have dedicated stereo out. The stereo input is a switched jack, so if you have a stereo source connected the audio from the JAMMA edge will be disconnected from the audio outputs. There is a separate 3.5mm stereo out jack for directly connecting to the cabinet's audio amp.
- Controls: Controls are collected into a 40 Pin IDC connector for routing to the control panel wiring of the cabinet. Buttons 1-3 are always connected to the JAMMA edge, buttons 4-5 can be switched between the JAMMA edge and the Kick Harness connector, and button 6 is always connected to the Kick Harness. Specific control panel adapters will be released for each cabinet that this project will support.
Future adapters will be designed for SEGA JVS cabinets and potentially Namco Noir cabinets if there is enough interest. Prototype PCBS are being made now, so testing should be able to commence in a couple of weeks. Pricing is still up in the air. I'll keep this thread updated when there is more info.
Last edited: