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Write data signal
This signal is used to write in data on the diskette.
Each time changing high levels to low levels, the
current flowing in the RIW head is reversed to
write in data bit.
This write-in performance is available when write
gate signal is at low levels.
@
Write gate signal
This signal being at low levels, data can be written
on the diskette. At high levels, read-out or
sequential operation may be made.
(j)
Side 1 select signal
This signal is given to decide which side of a
double-face diskette to read or write. The RIW
head of side 0 and that of side 1 are selected at
high levels and low levels, respectively.
(2)
Output signals
There are the following four kinds of output signal.
CD
Index signal
By this signal the. starting position of each track
can
be
detected. Each time the index hole of
diskette is detected with the detector, the track is
fed from the drive unit.
Usually, this signal level becomes low each time
the hole is detected at high levels. Therefore, the
leading edge of the signal indicates the beginning
of a track.
@Track 00 signal
The low-level state of this signal signifies that
the RIW head is located at track 00 position (the
outermost trackJ.
In any position other than track DO, the signal is at
high levels.
When the RIW head is at track 00, the head is held
at the position by the stopper even if another
signal to step outside is given. At this time,
however, the track 00 signal level becomes high.
By adding still another signal to step outside, the
motor phase is returned to cause track 00 signal
to become low.
-4-
@
Write protect signal
This signal is used to detect whether or not write
protect for the diskette is provided.
When a
diskette with write protect is in, the signal level
becomes low.
In usual operation, a diskette with write protect
enables to protect write statement within the
drive.
.~
Read data signal
The signal is given to transfer data read from the
diskette. Usually it is at high levels, while during
detection it comes down to low levels.
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