2 layers74 × 63.2 mm

Boards in 2 GitHub repositories, designed in KiCad, that use the ATTINY261A-PU by Microchip Technology (-40℃~+85℃ 1.8V~5.5V 10bit 128Byte 128Byte 16 20MHz 2KB 8 Bit AVR Built-in FLASH DIP-20 Microcontrollers (MCU/MPU/SOC) ROHS). See how each wires it, with its parts, size, README and files; the ATTINY261A-PU’s symbol, footprint and pinout are on its own page.


lenzjo/MECB-SYS-IO
I have brought out all available outputs along the top of the PCB, however, the PS/2 clock and data signals are also on the connector (pins C11 and A12 repectively) as are TxD (A16), RxD (A17), RTS (C16) and CTS (C19).