h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » OS_Byte 191 h2. OS_Byte 191 h5. (SWI &06) |_<^{width:4em}. Entry | | |<^. R0|<^. 191 (&BF) | |<^. R1|<^. EOR value | |<^. R2|<^. AND value | |_<^{width:4em}. Exit|_<^. | |<^. R0|<^. Preserved | |<^. R1|<^. Value before being overwritten | |<^. R2|<^. See serial state (see [[OS_Byte 192]]) | h4. Use The purpose of this call is to read or write the serial busy flag. h4. Notes The use of this call is deprecated. h4. See also * [[OS_Byte]] * [[OS_Byte 192]]