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=>     R0 =     153 (&99)
     R1 =     input buffer number
     R2 =     byte to insert

<=     R0 preserved
     R1, R2 corrupted
     C flag     set if buffer was full, otherwise clear

This call inserts a character into either the keyboard or serial buffer.

If     the current escape character (set with OS_Byte 220) is inserted and escape generation is not disabled (see OS_Byte 229 and OS_Byte 200)
then     an escape condition occurs
     either     an escape event is generated (if enabled with OS_Byte 14,6)
     or     the escape handler is called.
     The effects set by OS_Byte 230 occur when the escape condition is acknowledged with OS_Byte 126.

See PRM 1, page 172

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