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A
fa Iso (hiljhl
level on this
line selects the
read/wrile head on side
zero,
the
lower head, of the
driv(~.
A true
(low)
level on this line
selects
the
read/write
head
on
side
one,
the
upper hea.d,
of
the drivG.
Output Control Lines
Index/Sector
'Lhe
index/seCl,)r
sector siiJnals.
signal
is
composite
of
the
index pulse and
i\n
index
pulse
is
provided
once every
revolution,
2UU
millisecond~
nominal,
to indicate the heginning uf a trClck to the contcoller-.
Th(~
leadin!j
pdlJc
of
this
si.gnal
must
always he used to
t?rlSLlre
Liminid
accuracy_
'ftIP
irldex/sector line remains in the true
(low) state
[c)r
the duration of
ttle
index pulse, which is nominally f()ur
nlillisec()nds.
The sec lor
siljnal
sectored diskettes.
portion
appears
only
when
using
hard
Track 0
When
the
drive
is selected.
the Track 0
interface siynal.
when
true
(low).
indicates
to
the
controller that the read/write head(s) are
positioned
at
Track
O.
This
siljnal remains true
(low) until
the
heads are moved from Track O.
Write Protect
Protect
line goes true
(low).
the diskette is write
the write electronics are disabled.
It is recommended
not issue a Write command when the Write Protect siljnal
When
the
Write
protected
and
the controller
is true
(low).
When
the
Write
are enabled.
Protect line is false
(high).
the
write electronics
Composite Read Data
This
interface line transmits
the readback data to the controller when
the
drive
is selected.
It provides a pulse for each flux transition
detected from the diskette.
The Composite Read Data output line
goes
true
(low)
for
a
duration
of
1 + 0.25 microseconds for each flux
chanlje detected from the diskette.
The
the
leadinlj
edlje
true
position
of the Composite Read Data output pulse represents
of the flux transitions on the diskette's surface.
3-6
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