h6. [[ParallelDeviceDriver]] h6(. » [[ParallelDeviceDriver SWI Calls|SWI Calls]] h6((. » Parallel_Op h2. Parallel_Op h5. (SWI &42EC1) |_<^{width:4em}. Entry | | |<^. R0 |<^. "Reason code":#reasoncodes | h4(#reasoncodes). Reason Codes |_<^{width:4em}. # Value|_<^. Meaning | |<^. 0 |<^. [[Parallel_Op 0|Read data and status registers]] | |<^. 1 |<^. [[Parallel_Op 1|Write data registers]] | |<^. 2 |<^. [[Parallel_Op 2|Read/write control register]] | h4. Use The purpose of this call is to perform direct operations to the parallel hardware. h4. Notes Reason Codes shown are in decimal. h4. See also * [[Parallel_Op 0]] * [[Parallel_Op 1]] * [[Parallel_Op 2]]