IBM AT 5170 Technical Reference page 5

Federal Communications Commission
Radio Frequency Interference Statement
Warning: The equipment described herein has been
certified to comply with the limits for a Class B computing
device, pursuant to Subpart J of Part 15 of the FCC rules.
Only peripherals (computer input/output devices, terminals,
printers, etc.) certified to comply with the Class B limits may
be attached to the computer. Operation with non-certified
peripherals is likely to result in interference to radio and TV
reception. If peripherals not offered by
mM
are used with
the equipment, it is suggested to use shielded grounded cables
with in-line filters if necessary.
CAUTION
This product described herein is equipped with a grounded
plug for the user's safety.
It
is to be used in conjunction with
a properly grounded receptacle to avoid electrical shock.
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