2 layers170 × 105 mm

Ssio check
paulbruneau/ssio-check
A bench tester for the Bally/Midway MCR Sound I/O family: the 90908 Sound I/O and the 90913 / 91483 / 91657 Super Sound I/O (Z80, two AY-3-8910s, and all of the game's input ports).
72 parts
Boards in 1 GitHub repository, designed in KiCad, that use the APT3216YC by Kingbright (2.1V 20mA 588nm 590nm 8mcd Water Clear Yellow 1206 LED Indication - Discrete ROHS). See how each wires it, with its parts, size, README and files; the APT3216YC’s symbol, footprint and pinout are on its own page.

paulbruneau/ssio-check
A bench tester for the Bally/Midway MCR Sound I/O family: the 90908 Sound I/O and the 90913 / 91483 / 91657 Super Sound I/O (Z80, two AY-3-8910s, and all of the game's input ports).