Changes
/* ADDRESS:&FF07 IN/OUT UART REG2 */ formatting...
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If you want to transmit a character in a full duplex or a half duplex communication then you just send the character to the address &FF08 and the flags are automatically checked by the program of the microcontroller!
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BASIC: A A=X X OUT &FF08,A
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ASSEMBLY: LD LD BC,&FF08 LD LD A,X OUT OUT(C),A
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To select the type of communication you want to have (full duplex, half duplex or 485 halfduplex), you can use UART REG3.
=== ADDRESS:&FF09 IN RX – WAIT UDR CHARACTER ===
