The Drive Select jumper locations are identified as W3 (Address 1), W4 (Address 2), W5 (Address 3), and W6 (Address 4. Only one Drive Select jumper is installed on a drive. The drives are shipped with the jumper installed at W3. For every drive in a PC/AT installation, move the jumper from W4 (the special twisted interface cable that is generally used takes care of assigning a unique address to each drive). Some other systems may require that each drive be jumpered to a unique address (i.e., different DS numbers).
The Interface Terminator factory installed at RN1 provides proper termination for the interface lines. When daisy-chaining multiple 1300 drives, leave the terminator in the last physical drive on the daisy-chain cable; remove the terminator from each of the other drives. In most PC/AT applications, the C: drive is actually at the end of the cable and should retain the terminator.
W1 is the Write Fault Latch. If W1 is installed and the drive encounters a write fault, all writing to the drive is inhibited until after the drive has been de-selected. If W1 is absent, fault conditions are not latched. Drives are shipped with a jumper installed at W1; remove it for PC/AT applications.
W2 is always installed.
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