AT&T 6300 Service Manual page 142

INSTALLATIONS
Figure 3-37. Attaching the Small Expansion Box to
the System Module
9. For the WD Controller, go to Step 16. For the DTC
Controller, proceed with Step 10.
10. Verify jumpers are present on WI and W2
(Figure 3-38). This defines the HDU Controller port
address as 320.
11. Verify a jumper is present on W17 and is not present on
W18 (Figure 3-38). A jumper on W17 defines the starting
address for the HDU Controller EPROM at C800:0000, and a
jumper on W18 enables the HDU Controller EPROM. The
HDU Controller EPROM must not be present.
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