Some configuration faults related to uninitialized boards do not allow the system to get even
this far through start up, in which case it is necessary to insert the ENG LINK before switching
the power on. In this case the machine will boot straight into the engineer’s program.
In both cases the I
2
C bus linking the electronics boards is disabled. Without communication
between the DC RIO board and the Control board the OUTPUT TEST facility is ineffective,
and the state of some inputs will be misreported in the INPUT TEST routines. As a reminder to
this effect the sound associated with a key press is truncated to a very short pip rather than a
beep.
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