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Interface
Figure 2 below presents the
clocking scheme used by the module.

Figure 2: Clocking Scheme
The following are some clocking
strategies that can be utilized:
- C1 sources its clock from the oscillator by
enabling jumper J8, while C [2,3 or 4] can buffer this signal
(IO-9) to any connection on the NuBus, e.g. A30. A short circuit can then
be created between this interconnection, i.e. A30 and A31 by installing a
jumper wire.
- C [2,3 or 4] buffer A31 to IO-9 thereby
clocking C1. In this scenario, jumper J8 is removed and an external clock
is supplied to A31.
- Jumper J8's strategic location makes it
possible to insert a wire within the jumper and plug the other end into
NuBus A31. If this is done, a termination resistor (discussed ahead) may
be required between A31 and GND located on the NUBus connector.
- Make C1 use a separate clock, while C [2,3,
and 4] share their clock from A31.
Irrespective of the clocking
strategy, it is always important to consider the effects of clock skew.