System information

Installing Hardware Options
3-20
MicroVAX 3100 Models 88/98 User Information
External Options
The MicroVAX 3100 88/98 systems can accommodate the following options:
• SCSI devices and expansion boxes
• Printers, terminals, modems, and other devices that use asynchronous or synchronous
connectors
Your Digital sales representative can give you information on how to order a full range of
SCSI and Q-bus expansion boxes, printers, terminals, modems, and other devices that are
compatible with MicroVAX 3100 88/98 systems.
Connecting an External SCSI Option or Expansion Box
________________________CAUTION __________________________
• • The recommended maximum length of SCSI cables (internal length plus
external length) is 19.6 feet (6 meters).
• • Do not connect more than two tape drive devices, per SCSI port.
• • Some expansion boxes are restricted to either 110 V ac or (220 V ac)
operation. Make sure that the voltage requirement of the expansion box
used is compatible with the supply voltage.
• • Turn on the expansion boxes before you turn on the system unit. This
procedure ensures that the device in each expansion box is ready for use
and that the system firmware includes the device in the configuration
display.
• • Do not connect or disconnect SCSI expansion boxes while the system is
turned on. Doing so can cause damage to the equipment or corrupt
data.
• • Digital cannot guarantee the correct operation of any SCSI bus that
uses cable assemblies not supplied by Digital or not configured in
accordance with these guidelines.
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__________________________ Note ____________________________
Be sure to read the instructions that come with the SCSI device. If the cable
supplied with the SCSI device has the wrong type of connector, you will need an
adapter or a different cable.
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