On 2/2/25 10:42, Maciej W. Rozycki via cctalk wrote: > 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. Except that MIDI is a current-driven interface, not voltage like RS232. 5 ma currentloop, if memory serves.Voltage is secondary. --Chuck
