The ESP8266 most people are getting from China features a Tensilica Xtensa LX3 32-bit SOC clocked at 80 MHz. There’s an SPI flash on the board ... some code and some extended functionality ...

Of course, that means performance isn’t stellar, but tests show it can sustain about 5 Mbps, which isn’t bad for a little board ... extend your self-made RS232 network, you can still use an ...