Smol JVS IO is a scoped down JVS I/O board designed to work as a drop-in replacement for arcade stick PCB's, to allow them to interface with JVS hardware. It is not meant to function as a fully functional JVS IO in terms of functionality.

This hardware and software of this board was forked from td-io and then heavily scoped down to fit my needs. The td-io firmware is not directly compatible, due to design shortcuts on this board such as removing the shift registers.

At this point, I suppose not much of the td-io hardware schematic is used here any more. The firmware is still a pretty close fork though.

• JVS IO board interface as one-player device.
• Brook board compatible 20pin connector for hooking up player 1 stick and buttons.
• Upgradeable firmware

Note that earlier versions may miss some of these, or have other component identifiers, but overall should be the same.

• U1 ADM3485EARZ-REEL7 or ST3485EBDR (or some other pin compatible one)
• U2 Raspberry Pi Pico
• Q1 AO3400A (Or any similar mosfet)
• D1 BAV99S,115
• R1 0805 120ohm
• R2 0805 1k ohm
• J1 USBR-B-S-F-O-TH (Digikey: SAM10873-ND)
• J2 JST PH 1x4
• J3 JST PH 1x4
• J4 2.54mm Pinheader 2x10
• J5 JST XH 1x2

• Player 2 controls
• Chaining other JVS IO boards
• Video/Audio handling
• Analog controls, Mahjong controls...

Power can either be provided to the micro USB port of the raspberry pi pico, or through the +5V/GND pins of the board.

Flash the Raspberry Pi Pico with new firmware. Make sure stick is not powered from other sources.

CERN-OHL-W