IBM Personal Computer AT Manual To Operations page 260

Example 1
Screen Response Audio Response Action
+
Have the
Amount of
1 short beep
system unit
=}
memory shown
serviced
is wrong or no
cursor
Example 2
Screen Response
Audio Response Action
Parity Check 1
1117
Parity
"'
Check 2
1111
0'
ROM ERROR
No response
Have the
or
system unit
Parity Check
=}
or
any response
serviced
other than 1
ROM ERROR
short beep
is displayed
2-16 Error Examples