3. 3 Interface specifications
3. 3.
1
Cassette interface
As the name suggests, this is the interface for using an audio cassette
recorder as an external storage device. The FSK modulation method is used
to modulate data
''
1
''
to
2400
Hz and date
''
O
''
to
1200
Hz, and the
transmission rate is fixed at
1200
baud.
Sequence of data transmission
Below is the timing chart of the X 07 when a program is recorded (CSA VE)
on a cassete tape.
Time
CD
One program
@
(])
---
--
CSAVE
"Name"GIJ
CD
2400 Hz, 4 seconds
®
D3H X10
@
File name ("Name")
©
2 400 Hz, 0.25 second
@
Program data
@
NUL X13
(])
2 400 Hz, 0.5 second
CD
This is a header uritil the motor of the cassette recorder stabilizes. As it
lasts for
4
seconds, you can search for the beginning of a program by
sound.
®
This is an 8-bit code with ten D3H.
@
File name can be up to
6
characters. If fewer than
6
characters are used,
the remaining spaces are shortened.
©
This is the period for the X-07 to clear the text area.
@
The program data are written in the midway code form.
@
Thirteen 8-bit code
00
H are written.
(])
Separates one program from another.
121
Summary of Contents for X-07
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Page 8: ...1 Learning how to operate the X 07 2 Special functions and peripheral devices 3 Reference m ...
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Page 145: ...136 Instructions Others BEEP MOTOR REM Functions ABS FIX HEX INT SGN START TAB ...
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