Toshiba Portege R300 Maintenance Manual page 161

Subtest 01 Pressed key display
When you execute this subtest, the keyboard layout is drawn on the display as
shown below. When any key is pressed, the corresponding key on the screen
changes to the key character that was pressed. Holding a key down enables
the auto-repeat function that causes the key's display character to blink.
Press Del + Enter to end the test.
NOTE: The actual display may be different from the above image, according to the
model.
PORTEGE R300 Maintenance Manual (960-591)
3 Tests and Diagnostics
[CONFIDENTIAL] 3-41