Dataman S4 - Manual (Page 70)

DATAMAN S4 MANUAL
70 FUNC INFO = Self Test
FUNC INFO = Self Test
These tests used to verify the working of the
LCD, the keypad and the USER RAM. ENTER
will run the test. ESCape will pass on the next
test.
The LCD TEST fills the display with a character
sequence.
The KEYPAD TEST requires you to press all
the keys in sequence, left to right, top to
bottom. It cannot be completed until all the
keys have been pressed in turn.
The DESTRUCTIVE RAM TEST fills USER
RAM with a Pseudo-Random number
sequence, and then compares it with the same
sequence. The original contents are lost.