Made for piggy-backing the U-HID microcontroller from Ultimarc.
19 outputs – should use logic level MOSFETs (solenoids etc.)
27 inputs – from switches etc.
Pulldown resistors on all outputs
Zener diodes to protect back-voltage (never 100% safe)
LED on each channel for determing if an output is high
No longer available! Will soon be replaced by another board.
Note: Used on Astro Attack! game