Main components

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Part NumberDescription
W65C22
74AHCT5958-bit serial in/out Shift Register 3-State Outputs
SLG46826G
TLV73333PDBV
MCP7940N-xPReal-Time Clock, I2C, Battery Backup, DIP-8

io board schematic

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io board board layout

io board PCB render

Top PCB
Bottom PCB