Installing Optional Equipment 3-1
Installing Optional Equipment
3
This chapter provides information on installing the following optional upgrades:
• Installing external modems
• Adding memory
• Installing PortMaster expansion boards
• Removing PortMaster expansion boards
Installing External Modems
Follow these instructions to install external modems.
Required Equipment
❏ A standard male-to-male straight-through RS-232 cable (See “Male-to-Male
Straight-Through RS-232 Cable” on page B-3 for pinout information.)
This cable is available from most computer equipment suppliers.
❏ For the PM-25, a 4-foot (120cm) cable that splits into eight DB-25 straight-through
cables
❏ For attaching the PM-25 model to a U.S. Robotics Quad modem rack, a 3-foot
(90cm) cable that splits into two 50-pin high-density connectors
❏ External modems
Note – External modems can be connected to any asynchronous port. If a modem is
connected to the C0 or S0 port, set DIP switch 1 down and turn the power off and on.
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