[SER] Tibbits That Require UART Functionality

Some Tibbits, such as #01 (four-line RS232 port) and #02 (universal RS232/422/485 port), are designed to work with UART lines of the CPU. Of course, nothing "bad" will happen if you just connect them to regular general-purpose I/O (GPIO) lines. After all, UART communications at low baudrates can even be emulated with regular CPU pins. However, the intended use of these Tibbits is with TX and RX UART lines of the CPU.

TX and RX control lines, when present on a Tibbit, are always mapped onto the A and B control lines, respectively:

Size 2 and Size 3 Tibbo Project PCBs (TPPs) offer four "M" sockets with UART lines.