Toshiba M1 manual When the subtest is executed, the following message appears

3.19 Sound/Modem Test		3 Tests and Diagnostics
	To execute a subtest continuously, select the test number and press Enter. To exit
	the Sound/LAN/Modem test, remove the test program disk from the USB FDD and
	turn the computer off.
Subtest 02	Sin Wave
	This subtest is executed by the load format of COM file (ADSIN.COM). The
	program expands sin wave data table to data in 16-64KB, and creates play data (It
	sounds like continuous beep). By using wave measuring devices such as an
	oscilloscope, this program can read sine wave without expanding.

When the subtest is executed, the following message appears.

....Press test number[1-4] ? pause

Press any key to continue...

Press any key, and the following message appears. Then sin wave is expanded to 16-64KB data and is played.

....Press test number[1-4] ? call sin

When the beep sound finished, the screen returns to the main menu and the following massage appears.

....Press test number [1-4] ?

To execute a subtest continuously, select the test number and press Enter. To exit the Sound/Modem test, remove the test program disk from the USB FDD and turn the computer off.

TECRA M1 Maintenance Manual (960-436) 3-49