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Click on pictures for larger view.

Logic board Bottom view Jumper pins and terminators
Left side view Connector end view right side view
Top view Error map Drive identification sticker
  Micro-Vax chassis  

DEC RD54-EA Specifications
Size 5-1/4 Inch
Interface ST-506/412
Interface Type    
Encoding Method MFM (Modified Frequency Modulation)
Formatted Capacity 159.8MB
Disks 8
Heads 15
Cylinders 1224
Sectors 17
Buffer Size None
Average Seek 29ms
Single Track 4.0ms
Rotation Speed/Avg. Latency  
Transfer Rate to / from. media 5.0Mb
Transfer Rate to / from buffer  
Tracks Per Inch (TPI)  
Bits Per Inch (BPI)  

+12V +/-5% +5V +/-5% Power
Spin up   3.9A (max)    
Read / Write   2.0A avg  0.9A avg  
Typical      32 Watts

Drive Addressing and Interface Termination

DS1, DS2, DS3, DS4 Drive Select Jumpers
  The Drive Select jumper locations are identified as DS1, DS2, 
  DS3, and DS4. Only one Drive Select jumper is installed on a 
  drive. The drives are shipped with the jumper installed at DS1.
  For every drive in a PC/AT installation, move the jumper from DS1
  to DS2 (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).

RN1 Interface Terminator
  The Interface Terminator factory installed at RN1 provides proper
  termination for the interface lines. When daisy-chaining multiple
  1320 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 installations, the C: drive is
  actually at the end of the cable and should retain the

W1 Write Fault Latch
  W1 is the Write Fault Latch. If W1 is present 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 installations.

W2 is always installed.

W7 is never installed.

W8 is always installed.

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