[cctalk] Re: RS232 then and now

On Sun, 2 Feb 2025, Maciej W. Rozycki wrote:

I forgot to mention: MIDI has been another notable example where you want to wire a UART to another kind of line driver. I also have a computer where one of USARTs is multiplexed (software-configurable) between an RS-232 line driver with an external DE-9 connector (with pins multiplexed between synchronous-mode TxC/RxC clock lines and asynchronous-mode CTS/DSR inputs respectively) and an AC'97 audio codec (the codec uses the USART's synchronous mode with internal clocking). This one obviously also uses regular voltage levels to talk to the AC'97 device.