Data General 6662, Customer Documentation

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Installing the Drive
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014–002139
CNH7 (Jumpers 1 through 6)
Jumpers 1 through 6 in Tables 2 and 3 select the SCSI ID number for the drive. SCSI
ID 0 (jumpers 1-2, 3-4, and 5-6 off) is the factory default setting. Each SCSI device
connected to your computer must have a unique SCSI ID number. To choose the
correct SCSI ID number, refer to the installation or setup manual for your computer
system. It lists the SCSI IDs for each category of drive that your computer system
supports; for example, disk, diskette, or tape. Refer to Table 2 or 3, and reset jumpers
1-2, 3-4, and 5-6 to select the SCSI ID number that you have chosen. Use
needlenose pliers to add or remove the jumpers accordingly. Write down the SCSI ID
number that you assign to the drive. You will need to specify this number when you
access this drive with your operating system software.
CNH2 (Jumpers 1 through 4)
Jumpers 1 through 4 in Tables 2 and 3 are used for factory testing. Do not change the
settings of these jumpers.
CNH1 (Jumpers 1 through 24)
Refer to your installation or setup manual for your computer system or mass-storage
subsystem. If one of these manuals requires a jumper setting different than the
factory default setting for jumpers 1 through 24 (for example, enabling diagnostics
mode, instead of disabling diagnostics mode), use needlenose pliers to add or remove
the jumpers accordingly. If there is no mention of the jumper's function in these
manuals, leave the jumper in the factory default position.
Installing or Removing the SCSI–Bus Terminating Resistor
Pack on the Model 6662 and 6796 Drive
Figure 5 shows the location of the removable SCSI-bus terminator resistor pack on
the Model 6662 and 6796 drive board. Refer to the installing, maintaining, or
expanding manual for the computer system or mass-storage subsystem. In most
cases, you must remove this SCSI-bus terminator resistor pack because the computer
systems and mass-storage subsystems use an external SCSI-bus terminator plug.
To remove the terminating resistor pack, use a small screwdriver to gently pry up each
end of the resistor pack, as shown in Figure 5, until you can lift the pack off with your
fingers.
To install the terminator reisistor pack, match the notch or key on the pack with the
notch or key on the drive board socket, align the pins of the pack with the holes in the
socket as shown in, and insert the terminator pack into the socket.