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(3)
PSG
bit
allocation
Port
Bit
Input/
output
Connector
pin no.
Signal
when
joystick
used
A
0
CONTROLLER
1-1
pin
*1
FWD1
CONTROLLER
2-1
pin *2
FWD2
1
CONTROLLER-
1-2
pin
*1
BACK1
CONTROLLER
2-2 pin *2
BACK2
2
CONTROLLER
1-3
pin
*1
LEFT1
CONTROLLER
2-3 pin
*2
LEFT2
3
CONTROLLER
1-4 pin *1
RIGHTI
Input
CONTROLLER
2-4 pin *2
RIGHT2
4
CONTROLLER
1-6
pin
*1
TRGA1
CONTROLLER
2-6 pin *2
TRGA2
5
CONTROLLER
1-7
pin
»1
TRGB1
6
CONTROLLER
2-7 pin *2
TRGB2
7
CASR
(cassette
tape read)
B
0
CONTROLLER
1-6
pin *3
1
2
CONTROLLER
2-6 pin *3
>
High
level
3
Out
>ut
CONTROLLER
2-7
pin *3
4
CONTROLLER
1-8
—
5
CONTROLLER
2-8
-
6
Port
A
input
select
.
*1:
Effective
when
port
B
bit
6
is
low.
For
CONTROLLER
1
*2:
Effective
when
port
B
bit
6
is
high.
For
CONTROLLER
2
*3: Set
high
when
the port
is
not used
as
an output
port.
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