Spi and I2C are Ideally the ports
handle a radio and several gigabytes of MP3 files both from my bedside console and from at least one remote
I have been thinking about for 5 or 6 years
Of course you can implement RS-232 with open collector, but then of course it's not RS-232
Not RS232 because of open collector?... If there is an external pullup... Who will know??? It still works the same
Majenko..., I always thought RS485 took 3 wires, two for "Differential Data and one as ground... All three required... RS232 only requires two Tx OR Rx and ground.... Maybe you know something I don't?.