Alpha Microsystems Eagle 250 Посібник з експлуатації - Сторінка 18
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documentation accompanying the board. This section merely contains some cautions and issues to keep
in mind when adding a serial I/O board to an Eagle 250 computer.
The plastic connectors on the AM-138 are fragile, and can break if you are not careful when removing or
installing I/O boards. To minimize the chance of damage:
• Never apply excessive pressure or attempt to force a board into the connector. If aligned
properly, the board should install easily.
• Attach the cable that will go from the I/O board to the back panel before you insert the board into
the connector on the AM-138. Attaching the cable after the board is installed puts a sideways
pressure on the connector and could crack it.
• Similarly, do not unplug the cable to the back panel while the board is in the connector. Carefully
remove the board from the connector, then unplug the cable.
Most Eagle 250s include a small brace designed to support the I/O boards and prevent damage during
shipping. You can adjust this brace for the number of I/O boards currently in the computer. We
recommend you leave the brace in place to help prevent possible damage if the computer is jostled or
moved. See PDI-20791-00, Notice: Shipping Brace for I/O SIMM Boards, for instructions on removing
and adjusting the brace.
PERIPHERAL MOUNTING
Your Eagle 250 computer can hold six half-height peripherals, in three 3.5" and three 5.25" mounting
bays. One of the 3.5" bays and all of the 5.25" bays are accessible through the computer's front panel
after you remove the appropriate filler panels.
3.5" hard disk drives can be mounted in the 5.25" bays using special mounting brackets. The 3.5"
SCSI floppy drive requires a 5.25" mounting bay.
Figure 10 shows all six peripheral mounting positions.
We strongly recommend turning off system power before attaching or detaching any SCSI
peripheral. Attaching any device, internal or external, while there may be activity on the bus can
severely damage the peripheral or the SCSI controller.
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