Commodore 8250LP - VIII. INTERFACE; Recommended Read Operation Interface

B-5.
Side
0
Head
Side
1
Head
The
READ
operation
occurs
when
the
head
is
loaded
and
data
has
been
previously
recorded
on
the
track
of
interest.
Using
an
S/A
diskette
the
minimum
differential
amplitude
of
1.3
mY
peak-
to-peak
occurs
on
T~~
77
at
a
frequency
of
125
kHz.
A maximum
signal
amplitude
of
20
mY
occurs
on
TRK
00
at
a
frequency
of
625
kHz.
The
customer
is
cautioned
to
use
propzr
clamping
for
the
read
operation.
A
recommended
interface
is
shown
in
figure
4.
~
~n,
4-MA
162
:<
~
'tt'
'"
orEq
r
I
12VA
2-9.09k
1~
•
!1
p
~e
~.
--~~--'~~~-----<:<~----~
i
//
I
P2
-:.
0
,.-..----.-----
..
"
..
Diffe!"encial
Read
Que
:\mll.
I
p))>-I
______
l_.5_._:.:
...:.t
___
-<fo--l._S_k_:~r/-,..·-__:J>~
\
470
)1
Selected
5
ice
is
OV
P2-3
(or
ReAd
Qperacion
'----"7~>---------------...------\\'Y-.
-----,:;.:;..
-\70
Fig.
4 A
RECO~~~~DED
I~TE~~ACE
FOR
READ
OPE~\TION
XOTE:
Figure
3
and
4
interface
circuits
are
valid
only
when
used
in
connection
with
each
other.
(9)