Service manual

MZ-800
See
next
for
the contents
of
the
information
block.
Name
Byte
count
Function
Note
ATRB
1
Attribute
NAME
17
File
name
(16 characters
maximum)
CR
(OD)
affixed
SIZE
2
File byte size
DTADR
2
Loading address
EXADR
2 Execution address
1----
COMNT
104
Comment
Rotation
of
the cassette (dedicated) is
controlled
by
the
8255
and its peripheral circuits.
To cassette
8255
r-~-~-----
MOTOR
PC.
PC3~--t.
ClR
r-~-+~~~-
SENCE
Q~
If switch has
not
been
ON
on
the
cassette recorder side,
SENCE
signal is in
high
state. When a switch (REW,
FF,
etc.) is pushed,
it
makes
the
signal
turned
low.
It presets
the
D-FF
and
the
motor
starts
to
rotate
with
MOTOR in
high state. With
lock given
to
the
D-FF
through
PC3,
it
permits on/off control
of
the
motor.
If
a switch is pushed
on
the cassette recorder side,
it
permits
examination
of
the
motor
operating state
by
means
of
Land
PC4.
Repeated
-
SENCE
1-1---------,1,..---
PC
3
__
.L
L...---'\\---t---""F:
======:;::1
rL
MOTO~
! L
®
=====*==~~~====*=====~:'\
:
Execution
No
change
·PLA
Y t "
of
load in MOTOR is
command
signal
(PC4)
displayed.
Ur===i=1
=
PLAY
SW ON
End
of
load
30
In
order
of
low
to
high order
Not
used
For use
of
other
than MZ-800 cassette tape recorder
type,
it
needs
to
short
SENCE
to
GND,
READ
to
EXREAD, and
WRITE
to
EXWRITE
of
the
connector T-5.
Use
of
the
cassette recorder
of
other
kind may some-
times
not
permit
proper
loading and saving operation.
In such an event,
adjust
the
volume
and
tone
controls
to
find
the
optimum
positions. To meet the opposite
polarity
of
cassette tape recorder, there is a
dip
switch
provided. Changing
the
switch position makes TPSW
signal
state changed so as
to
invert
the
signal wave-
form.