Toshiba 430CDT Maintenance Manual page 77

Subtest 05 Joystick/MIDI wraparound
Conduct a wraparound test on the joystick/MIDI port.
Subtest 06 Codec (Line In/Out)
Load the file ESS688L.COM. Connect a sound source such as a CD player or
stereo to the line-in port. Next, connect an output device such as an amplifier
for the internal speaker or a radio/cassette player to the line-out port.
After making the connections, a dialogue box will be displayed. Press Enter
to play a recorded sound. About three seconds after the recorded sound is
played, the dialogue box will be displayed again.
NOTE: The Enhanced Port Replicator must be connected to conduct the
line-out test.
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430 Series