Digital Equipment TA867 Use And Installation Manual - Page 15

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4–2 Operation
Table 4–1 lists the function and state of each control/indicator:
Table 4–1 SA106 and TA867 Controls and Indicators
Control
/Indicator
Port Select A
Port Select B
Fault
Ready
Unit number
TZ867
Figure 4–1 shows the SA106 configuration.
Function/State
In the enable (in) position, PORT SELECT A allows the HSC to
access port A. Under microprogram control, the HSC can then
cause port A to go on line.
Placing Port Select A in the disable (out) position with port A on
line causes serious errors at the HSC.
Port Select A lights when port A is on line (ready to receive any
command or data).
The definition of Port Select B for port B is the same as the
definition of Port Select A for port A.
The fault indicator lights when a potentially fatal error has been
detected in the formatter. Even though an error has occurred, the
formatter still attempts to communicate with the HSC.
With a fatal error present, press the Fault switch to clear the
error.
The ready indicator lights after the SCSI/STI adapter successfully
completed its power-on self-tests (POST).
DSA unit number
See the Tx867 Series Magazine Tape Subsystem Owner's Manual