2 layers52.8 × 40.4 mm

OtterX RamExp
hkzlab/OtterX_Ram_Expansion
RAM Expansion for the OtterX (CommanderX16 compatible) computer
9 parts3
Boards in 1 GitHub repository, designed in KiCad, that use the 74AC139PC by onsemi (-40℃~+85℃ 24mA 24mA 2V~6V 4uA 6.5ns@5V,50pF 74AC Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHS). See how each wires it, with its parts, size, README and files; the 74AC139PC’s symbol, footprint and pinout are on its own page.

hkzlab/OtterX_Ram_Expansion
RAM Expansion for the OtterX (CommanderX16 compatible) computer