Note that the adapter board has 3 separate power rails: +5V (supplied by the USB host), +3V3 (from the Pico's on-board regulator), and +9V (from an external DC power brick, for the keyboard). The ...
This is a simple serial interposer board for NABU PCs that intercepts the Tx and Rx signals from the TR1863 UART and routes them to an FTDI USB-serial adapter rather than to the RS422 line drivers on ...
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