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-
L
:
-
X~
-
ratr
,
;"
,:
tig~~|
~
FUNCTION TABLE
(
INPUTS
OUTPUTS
|
ENABLE
|
SELECT
G1
G2*
C
B
A
YO
Y1
Y2 Y3 Y4 Y5 Y6 Y7
X
H
X
X
X
H
H
H
H
H
H
H
H
L
X
X
X
X
H
H
H
H
H
H
H
H
H
L
L
A
L
L
H
H
H
H
H
H
H
H
L
L
1
H
H
L
H
H
H
H
H
H
H
L
L
H
L
H
H
L
H
H
H
H
H
H
L
L
H
H
H
H
H
L
H
H
H
H
H
L
H
L
L
H
H
H
H
L
H
H
H
H
L
H
L
H
H
R
H
H
H
L
H
H
H
L
H
H
L
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
H
H
H
H
L
FUNCTION TABLE
INPUTS
OUTPUTS
ENABLE
G
SELECT
B
A
YO
Y1
Y2
Y3
H
X
X
H
H
H
H
L
L
L
L
H
H
H
L
L
H
H
L
H
H
L
H
L
H
H
L
H
L
H
H
H
H
H
L
FUNCTION TABLE
j
INPUTS
Select
Strobe
G
Y
X
H
L
L
L
A
H
L
B
FUNCTION TABLE
INPUT
OUTPUTS
QA
~ QD
Clear
CK
Enable
Output
control
G1
G2
M
|
N
L
IT
L
L
-
ID
~ 4D
L
H
X
-
-
X
H
H
X
X
X
-
LLLL
-
H
X
Z
X
H
G
DIR
L
L
B
data
to
A
bus
L
H
A
data
to
B bus
H
X
Isolation
TC74HC259P
[8
BIT
ADDRESSABLE
LATCHES]
(IC42, 43)
FUNCTION TABLE
CLOCK
CLEAR
OUTPUT
STATE
X
H
ALL
OUTPUTS
=
"L"
f
L
NO CHANGE
_
1
L
ADVANCE TO
NEXT
STATE
X:
DON'T CARE
m
TC74HC373
[3
STATE
OCTAL
D-TYPE LATCH]
(IC21)
LATCH
ENABLE
OUTPUT
10
10
2D
20
3Q
3D
4D
40
GND
CONTROL
TC74HC374
[3
STATE
OCTAL
D-TYPE
FLIP-FLOP]
(IC54)
Vcc
60
8D
70
70
60
6D
50
50
CLOCK
FUNCTION TABLE
Output
Control
Clock
Data
Output
L
t
H
H
L
T
L
L
L
L
X
Qo
H
X
X
Z
APD780C
[8
BIT
CPU]
(IC1)
I6BIT
ADDRESS
BUS
REFRESH
MACHINE CYCLE ONE
RESET
BUS
REOUEST
WAIT
CONTROL
BUS ACKNOWIEDBE
WRITE
CONTROL
READ
CONTROL
^PD8237 AC-5
(IC9,
10)
[PROGRAMBLE
DMA
CONTROLER]
ADDRESS
BUS
END
OF
PROCESS
ADDRESS
BUS
+
SV
DATA
BUS
DMA
ACKNOWIEOGE
DATA
BUS
//PD710540P
[PROGRAMMABLE
fi
PD8253C-2
INTERVAL
TIMER]
(IC5,
6, 7, 8)
-E5V
WRITE
CONTROL
READ CONTROL
CHIP
SELECT
ADDRESS
BUS
COUNTER
CLOCK
COUNTER
OUT
COUNTER GATE
COUNTER
CLOCK
COUNTER SATE
COUNTER
OUT
/iPD8255
AC-2 [INTER FACE]
(IC41)
OPERATION
BUTTON
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