h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » OS_Byte 193 h2. OS_Byte 193 h5. (SWI &06) |_<^{width:4em}. Entry | | |<^. R0|<^. 193 (&C1) | |<^. R1|<^. EOR value | |<^. R2|<^. AND value | |_<^{width:4em}. Exit|_<^. | |<^. R0|<^. Preserved | |<^. R1|<^. Value before being overwritten | |<^. R2|<^. Corrupted | h4. Use The purpose of this call is to read or write the flash counter. h4. Notes This call reads or sets the count-down timer for flashing colours. Provided that the flash period is not infinite, the counter is loaded with the duration of the first flash colour and counts down by one every VSync until it reaches zero. At this point the colours are swapped and the counter loaded with the second flash period. etc. h4. See also * [[OS_Byte]] * [[OS_Byte 194]] * [[OS_Byte 195]]