IBM 5155 Manual To Operations page 109

Test 700
1
Do you have an mM Math Coprocessor
installed in your system?
NO - Continue with the next Test.
YES - Did the following appear on your screen
for more than 10 seconds?
TESTING MATH COPROCESSOR
YES - Have the system unit serviced.
NO - Go to the next step.
January
1984
Test 700-1