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


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