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 2 GitHub repositories, designed in KiCad, that use the SN74HC541N by Texas Instruments (-40℃~+85℃ 1 10ns@6V,50pF 2V~6V 7.8mA 7.8mA 74HC 8 80uA Output enable Tri-State Unidirectional DIP-20 Buffers, Drivers, Receivers, Transceivers ROHS). See how each wires it, with its parts, size, README and files; the SN74HC541N’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).

drewsipher/sharkcnc
Open CNC control stack for a Sherline 2000: FluidNC ESP32-S3 breakout hardware + host software plan