Control Data Corporation BR8 SERIES Hardware Maintenance Manual page 30

SIGNAL
OUTPUT LINES
-SECTOR
+
WRITE FA ULT
-WRITE FA ULT
-TRACK 00
-WRITE PROTECT
-READ DATA
(Separated) *
-C LOCK (Separated) *
-READ DATA
(Composite)
Table 4-2. (continued)
FUNCTION
This line gives an indication of the rotational position of the
diskette by outputting a logic 1 pulse for every sector hole
of the diskette. The 1.5 millisecond pulse is generated by
sensing the sector holes with the same photo-optical
assembly used for index.
A logic 0 level indicates one or more of the following fault
conditions.
- Write enable without head load.
- Write enable without write data.
Incorrect write data rate.
A logic 1 level indicates one or more of the following fault
com itions.
- Write enable without head load.
-Write enable without write data.
Incorrect write data rate.
A write fault can be cleared by a logic 1 on the write fault
reset line.
A logic 1 level indicates that the he ad is pos itioned over
Track 00.
Logic 1 level indicates that hole on-diskette is uncovered.
This line contains the separated data information. A logic
1 level pulse of. 250 nsec corresponds to a data 1 bit read
from the diskette.
This line contains the separated clock information. A
logic 1 level pulse of 250 nsec corresponds to a clock bit
read from the diskette.
This line contains the unseparated data and clock information.
A logic 1 level pulse of 250 nsec corresponds to a data or clock
bit read from the diskette.
*The signals are valid only when double frequency recording without missing clock
is used.
4-10
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