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5.
DATA
RECORDER
5-1.
Data recorder (MZ-lT01)
Data transfer with the recorder is carried out
via
the 8255.
The
read data
is
sent out through
the
port
Cl
and the
write data
is
received through the port
C5.
The motor
on/off control
is
carried out
via
the port
C3
and that
activation
of
the motor
is
confmned through the port
C4.
The
signal
SENSE
goes
low when FF,
REW,
or PLAY
pushbutton
is
pushed on the
MZ-}
TO
I.
Block
diagram
+5V
Control
circuit
• Cassette specification
Method
PWM
recording
method
Rated power
5V
± O.25V
Wait: 2mA
Rated
current
Record:
210mA
(TEAC TEST TAPE)
Playback:
150mA
(TEAC TEST TAPE)
Transistor x 5
Semiconductors used
IC x 2
Diode
x4
Tape used
C30 - C90
Rated
tape
speed 4.75cm/sec
Tracks
2 tracks, monoral
Motor
5V
electronic governor
motor
Bias DC
Erasure
DC
Standard playback
point
lmsec
-
500
sec
Nominal
input
L: O.4V, max.
level
and
H: 2.0V, min.
input
impedance
R~cording
terminallOkn
min.
Nominal
input
level
L:
O.4V, max.
H:
2.0V, min.
Erase
head
------
Record/playback head TAPE
Differentiation
circuit
o-
__
~
______________
~
__
~
____________
~
____
~03003
R3003
R3004
Amplifier
03003
SW3002
Mechanically
interlinked
switch
WRITE
READ
15
Amplifier
Amplifier/
circuit
+5V
Limiter
03001
-~---!
circuit(1/2),
03002
IC3001
Waveform
shaping
circuit
(2/2),
IC3001
Amplifier
circuit,
03004