Tekram Technology DC-820B - Manual (Page 13)

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EISA Fast SCSI Caching Adapter
Warning: Do not power-down the system while this LED is still
active. Doing so may result in loss of data as the contents of the
cache buffer have not been completely written to the disk.
Mirroring Beeper (JP2)
JP2 is used to issue the warning beep through a speaker when an error occurs
during the process of disk mirroring. It can be connected to the SPEAKER in
the front panel of your system or to another speaker complying with the same
specification of the system’s SPEAKER.
Floppy Enable/Disable (JP3)
JP3 is shorted to enable the floppy controller of the DC-820B. Note that only
one floppy controller can be enabled in the system. If another floppy control-
ler in the system cannot be disabled, then JP3 should be left open (floppy
controller disabled).
1.2 Checking the Terminators on the SCSI Bus
In order to stabilize the SCSI bus only two sets of resistor array terminators
should be installed — one at each end. Since DC-820B equips with Active
Terminators on board and can be selected to Enable or Disable by entering
the ECU utility of your mainboard, you don't need to open your cabinet to do
the adjustment (refer to Sec. 1.6.2 for Controller Terminator option). The
following explains the terminators installation:
1. Only internal devices are connected to the DC-820B: Leave terminators
mounted on both the host adapter (i.e., Enable) and the last device connected
to the internal SCSI cable. Remove the terminators on all devices connected
in between.
2. Only external devices are connected to the DC-820B: Leave terminators
mounted on both the host adapter (i.e., Enable) and the last device connected
to the external SCSI cable. Remove the terminators on all devices connected
in between.
3. Both internal and external devices are connected to the DC-820B: Re-
move terminators on the host adapter (i.e., Disable) and leave the other sets
of terminators mounted on the last devices connected to the internal and