Sharp MZ-800 Service Manual page 31

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.