ATTiny2313 AY-3-8912 emulator

Is it possible to emulate AY-3-8912 PSG only with ATTiny2313 microcontroller? The answer is yes, it is. I made only serial interface because I don't have intention to use it as replacement for real AY-3-8192 integrated circuit, although also that would be possible.
Serial port settings: 115200,8,N,1,N
The data is sent in RV pairs where R is the register and V is the value to be written into register.

Electronic schematic

Finished electronic circuit


attiny2313_ay_emulator.hex  HEX file to burn into ATTiny2313 microcontroller
   Fuses: H=0xDB L=0xEF

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