Pioneer PX-7 Service Manual page 95

Fig
13-33
Keyboard
interface circuit
KB
l/F
TIMING
CHART
I/O
WRITE
INSTRUCTION FETCH
I/O
READ INSTRUCTION FETCH
I/O
WRITE
m/M/hM//7777m
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V
i
i'l
fti
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DATA
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j
I
/
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BIDIRECTIONAL BUS
-
s
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i'
_jff~
YA THRU YD
LATCH
©
BIDIRECTIONAL BUS
-
W/777//777777771/TM
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wm7m
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.
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OUT
VIOUS
DATA
S
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C
p E
j_
AY
2
1
kxo-3
in
1
I
DATA READ
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r
Fig.
13-34
Keyboard
interface
timing chart