h6. [[OS SWI Calls]] h6(. » [[OS_Byte]] h6((. » OS_Byte 160 h2. OS_Byte 160 h5. (SWI &06) |_<^{width:4em}. Entry | | |<^. R0|<^. 160 (&A0) | |<^. R1|<^. [[OS_Byte 160 VDU Variable Numbers|VDU variable]] | |_<^{width:4em}. Exit|_<^. | |<^. R0|<^. Preserved | |<^. R1|<^. value of variable | |<^. R2|<^. value of next variable (entry R1 + 1)| h4. Use The purpose of this call is to read the VDU variable value. h4. Notes This call is provided for compatibility with the BBC/Master 128, and reads various VDU variables. Note that it does not use the same numbers for variables as [[OS_ReadVduVariables]], and that that SWI can read many more variables. h4. See also * [[OS_Byte]] * [[OS_Byte 160 VDU Variable Numbers]] * [[OS_ReadVduVariables]]