h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » OS_Byte 129 h2. OS_Byte 129 h5. (SWI &06) |_<^{width:3em}. Entry | | |<^. R0|<^. 129 (&81) | |<^. R1|<^. Dependant upon operation | |<^. R2|<^. Dependant upon operation | h4. Use This call has four specific uses that are determined by the values passed in R1 and R2. * [[OS_Byte 129 (time)|OS_Byte 129 (read a key within time limit)]] * [[OS_Byte 129 (OS)|OS_Byte 129 (read OS version)]] * [[OS_Byte 129 (scan range)|OS_Byte 129 (scan keyboard for range of keys)]] * [[OS_Byte 129 (scan single)|OS_Byte 129 (scan keyboard for single key)]]