h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » [[OS_Byte 128]] h6(((. » Reason Codes h2. Reason Codes |_<^{width:4em}. Entry | | |<^. 0|<^. Return switch state and number of last ADC channel converted| |<^. 1 - 4|<^. ADC channel number for which to return value | |<^. 7|<^. Mouse x | |<^. 8|<^. Mouse y | |<^. 246|<^. Free bytes in mouse buffer | |<^. 252|<^. Free bytes in printer buffer | |<^. 253|<^. Free bytes in serial output buffer | |<^. 254|<^. Free bytes in serial input buffer | |<^. 255|<^. Free bytes in keyboard buffer | h4. Notes Note that for reading free space, R1 = 255 – [[Buffer Numbers|buffer number]]. h4. See also * [[Buffer Numbers]] * [[OS_Byte]]