Atari 400 Technical Reference Manual page 131

o
1
2
o
o
3
4
o
o
5
6
o
o
7
8 10 12
0 0 0
0 0 0
9 11 13
where: 1
=
computer CLOCK IN.
2 = computer CLOCK OUT.
3
= .computer DATA IN.
4
=
GND.
5
6
7
8
9
10
11
12
13
=
=
=
=
=
=
=
=
=
Figure 9-4
computer DATA OUT.
GND.
COMMAND-.
MOTOR CONTROL.
PROCEED-.
+5v/READY.
computer AUDIO IN.
+12v.
INTERRUPT-.
Serial Bus Connector Pin Descriptions
CLOCK IN is not used by the present
as
and peripherals. This
line can be used in future synchronous communications schemes.
CLOCK OUT is the serial bus clock. CLOCK OUT goes high at the
start of each DATA OUT bit and returns to low in the middle
oT
each bit.
DATA IN is the serial bus data line to the computer.
Pin
4
GND is the signal/shield ground line.
DATA OUT is the serial bus data line Trom the computer.
Pin 6 GND is the signal/shield ground line.
COMMAND- is normally high and goes low when a command Trame is
being sent Trom the computer.
MOTOR CONTROL is the cassette motor control line (high=on.
low=
oTT).
PROCEED- is not used by the present
as
and peripherals; this line
is pulled high.
+5v/READY indicates that the computer is turned on and ready. This
line can also be used as
a
+5 volt supply
oT
50ma current rating
Tor ATARI peripherals only.
AUDIO IN accepts an audio signal Trom the cassette.
OPERATING SYSTEM C016555 -- Section
9
146