Switches, Leos, And Jumpers 7-B; Switchbanks1; Pushbutton S2 - Qualstar 1260 User Manual

7-8
off, and always turn the tape drive on after applying power to the system. Be sure
that the tape drive is never turned on when the system is off.
7.8
Switches, LEDs, and Jumpers
7.8.1
7.8.2
A non-volatile memory in the form of an EEPROM retains configuration and option in-
formation when the power is off. Each time the power is applied, the configuration
data in the EEPROM is copied to RAM. You can edit the configuration data in the
RAM by using a combination of pushbutton and DIP switches on the SCSI PCBA. The
altered data can then be stored in the EEPROM, overwriting the previous configura-
tion data. You can also restore the original factory configuration data at any time.
Changing the configuration of the SCSI PCBA consists of the following process:
• Viewing the current configuration data in the RAM;
• Accessing the location(s) in RAM you want to edit;
• Editing the data;
• Saving the new configuration data.
Four mode select switches (S3), eight address/data switches (Sl), an on-board Load
switch (S2), and eight light emitting diodes, or LEDs, (DS7 - DSO) provide communica-
tions with the SCSI PCBA. These LEDs, Sl, and S2 are shown in Figure 7-2.
Switchbank S1
S1 is a bank of eight DIP switches located near the top of the SCSI PCBA (see Figure
7-8 on page 7-33) which allow you to edit the configuration data in the RAM. These
switches are used to encode two-digit hexadecimal numbers (00 through FF) as shown
in Figure 7-39.
Pushbutton S2
S2 is a momentary pushbutton switch whose function varies according to the current
mode, and according to the sequence of events in that mode. S2 is used to view and
edit RAM data. The following S2 events are significant:
• Pressing S2
• Releasing S2
• Holding S2 longer than two seconds before releasing it
Supplemental SCSI Drive Information
500250 K