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(2)
PPI
bit
allocation
Port
Bit
Input/
output
Signal
Details
A
0
CSOL
Slot
designation
number
of
ad-
dresses
1
CSOH
0000
to
3FFF
2
CS1L
Slot
designation
number
of ad-
dresses
3
Ou
put
CS1H
4000
to
7FFF
4
CS2L
Slot
designation
number
of ad-
dresses
5
CS2H
8000
to
BFFF
6
CS3L
Slot
designation
number
of
ad-
dresses
7
CS3H
C000
to
FFFF
B
0
S
7
In
f
ut
Keyboard
return
signal
C
0
KBO
2
KB2
Keyboard
scan
signals
3
Out
put
KB3
4
CASON
Cassette control
(L-ON)
5
CASW
Cassette write
signal
6
CAPS
CAPS
lamp
signal
(lights
when
low)
7
SOUND
Sound
output based
on
software
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