h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » OS_Byte 176 h2. OS_Byte 176 h5. (SWI &06) |_<^{width:3em}. Entry | | |<^. R0|<^. 176 (&B0) | |<^. R1|<^. EOR value | |<^. R2|<^. AND value | |_<^{width:3em}. Exit|_<^. | |<^. R0|<^. Preserved | |<^. R1|<^. Value before being overwritten | |<^. R2|<^. Corrupted | h4. Use The purpose of this call is to read or set the 50Hz counter. h4. Notes This call reads or sets the "50Hz" counter, a 1 byte counter which is decreased every vSync. As a consequence the rate of this counter is actually mode and monitor dependent, and should not be used for accurate timing. h4. See also * [[OS_Byte]]