h6. [[OS SWI Calls]] h6(. » [[OS_Word]] h6((. » [[OS_Word 21]] h6(((. » OS_Word 21,4 h2. OS_Word 21,4 h5. (SWI &07) |_<^{width:4em}. Entry | | |<^. R0 |<^. 21 (&15) | |<^. R1 |<^. Pointer to block, containing:| |>^. +0|<^. 4 (reason code)| |_<^{width:4em}. Exit | | |<^. R0 |<^. Preserved| |<^. R1 |<^. Preserved, block updated containing:| |>^. +1|<^. X LSB| |>^. +2|<^. X MSB| |>^. +3|<^. Y LSB| |>^. +4|<^. Y MSB| h4. Use The purpose of this call is to read the unbuffered mouse position. h4. Notes The unbuffered mouse position, may be significantly out of step with the buffered values. h4. See also * [[OS_Word]] * [[OS_Word 21]]