AT&T PC 6300 - Hard Disk Unit Controllers (Optional)

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SYSTEM OVERVIEW
Hard Disk Unit Controllers (Optional)
If a HDU is added to the system (internally or externally), the
HDU Controller (Figure 2-15) or (Figure 2-16) must be installed to
interface the HDU with the 8086 CPU. The HDU Controller is a
' , circuit board that plugs into one of the 8-bit expansion slots on the
Bus Converter. It is attached to the HDU with two ribbon cables.
^ Refer to "Appendix A" for information on how to configure the
HDU controller.
There are two types of HDU Controllers, the DTC (Data
Technology Corporation) and the WD (Western Digital). The
physical differences between the Controllers are:
1. The DTC Controller is a full-size modular circuit card. The
WD Controller is a half-size modular circuit card.
2. Each HDU Controller must be configured for the type of drive
used (see Appendix A). The DTC Controller is configured by
setting the DIP Switches on the card. The WD Controller has
jumpers that must be placed.
p Each Controller formats the hard disk drives differently; therefore,
I / they cannot be interchanged without performing the following:
• Make a backup copy of all data if possible
• Low-Level Format the drive using the System Test
• Partition the drive using the MS-DOS FDISK
• Restore the backup data.
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