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TABLE 3-3.
COMMANDS (CONT ' D)
Command
Definition/Function
DSB2 (Cont'd)
Detailed Status
Byte 3 (DSB 3)
Tag 2B
83318200 D
2 3
Not Used
NO or Multiple Head
Selection
Loss of
AC
Write
CUrrent
Write Current with-
out Write Command
Write Command with-
out Write Current
Meaning
Head number 19 or greater
(non-existent) is selected or
more than two heads have been
selected.
NOTE
The remaining DS2 bits
apply only while writing
wi th DMl down.
NO write driver output current
transitions were detected for
900 nanoseconds.
Write current is sensed but
Write Enable is down.
Write Enable is up, but there
is no write current.
1.
An
input information command.
2. Sends a byte of status to the controller concerning the error
condition identified on the bidirectional data lines.
3. The
•
•
•
4. The
error conditions are reset
by
any of the following:
Device Initialize (DIN) signal.
Pushinq CHECK switch/indicator
By the DSB_3 command
bidirectional data lines are interpreted as follows:
!!!!!.
Not Used
Rotational Position
Sensing Fault
Not Used
Positioner
Overtravel
Meaning
While not in Set Diagnostic
Escape Mode, sector counter
did not reach a count of 127
before Index was sensed. Also
sets Device Failure (SSR bit
2 1 ).
Positioner went forward past
cylinder 822
(Forward EOT)
or reverse past cylinder 000
(Reverse EOT) if not perform-
ing an RTZS.
Also sets DLI
Error (SSR bit 2 3 ).
3-37
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