The W3 jumpers are put in place after the testing phase of Macintosh IIcx
production is completed. When removed, the test equipment can arbitrate
directly with the MC68030 microprocessor. They should never be removed
unless the logic board is being serviced by factory technicians.
Though the jumpers shouldn't be removed, the logic board will function
properly without them -- as long as there is no bus master card, such as
an accelerator, in any of the NuBus slots.