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## mars.mips.instructions.syscalls
Class SyscallMidiOut

    java.lang.Object
      mars.mips.instructions.syscalls.AbstractSyscall
          mars.mips.instructions.syscalls.SyscallMidiOut

All Implemented Interfaces:
  Syscall

    public class SyscallMidiOut

extends AbstractSyscall

Service to output simulated MIDI tone to sound card. The call returns immediately upon generating the tone. By contrast, syscall 33 (MidiOutSync) does not return until tone duration has elapsed.

Constructor Summary
`SyscallMidiOut()` Build an instance of the MIDI (simulated) out syscall.

Method Summary
`void` | `simulate(ProgramStatement statement)` Performs syscall function to send MIDI output to sound card.

Methods inherited from class mars.mips.instructions.syscalls.AbstractSyscall
`getName, getNumber, setNumber`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SyscallMidiOut

    public SyscallMidiOut()

  Build an instance of the MIDI (simulated) out syscall. Default service number is 31 and name is "MidiOut".

Method Detail

### simulate

    public void simulate(ProgramStatement statement)
                  throws ProcessingException

  Performs syscall function to send MIDI output to sound card. This requires four arguments in registers $a0 through $a3.
  $a0 - pitch (note). Integer value from 0 to 127, with 60 being middle-C on a piano.
  $a1 - duration. Integer value in milliseconds.
  $a2 - instrument. Integer value from 0 to 127, with 0 being acoustic grand piano.
  $a3 - volume. Integer value from 0 to 127.
  Default values, in case any parameters are outside the above ranges, are $a0=60, $a1=1000, $a2=0, $a3=100.
  See MARS documentation elsewhere or www.midi.org for more information. Note that the pitch, instrument and volume value ranges 0-127 are from javax.sound.midi; actual MIDI instruments use the range 1-128.

  Specified by:
    `simulate` in interface `Syscall`
  Specified by:
    `simulate` in class `AbstractSyscall`
  Parameters:
    `statement` - ProgramStatement object for this syscall instruction.
  Throws:
    `ProcessingException`

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