Radio Shack VoxBox TRS-80 - Appendix D. Parts Circuit Diagrams; Logic Gate and Buffer Diagrams; LM339 and LM324 Diagrams

APPENDIX
D.
Parts
Circuit Diagrams
8-INPUT
POSITIVE-NAND GATES
74LS30
positive logic:
Y
=
ABCDEFGH
VCC
NC H
G
NC
NC
Y
i\
^riiriirT^Tiriiriir
C D E
F
GND
QUADRUPLE
2-INPUT
POSITIVE-NOR
GATES
74LS02
positive
logic:
Y
=
A+B
Vcc
4Y 4b 4A
3Y
3B_
3A
1Y
1A
IB
2Y 2A
2B GND
QUADRUPLE
BUS BUFFER
GATES WITH THREE
STATE OUTPUTS
74126
positive logic:
Y
=
A
Output
is
off (disabled)
when
C is low.
VCC
*C
4A 4Y 3C
3A 3Y
See page
6-33
>
1C
1A 1Y
2C
2A
2Y
GND
SN54126U,
W) SN74126(J,N)
SN54LS126
(J, W) SN74LS126
(J, N)
LM339
schematic
and
connection diagrams
_L-,
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3
5 A
(5)lOO„A
(JJ)]S„A
()
-INPUT
O-
W
"
^
i
^
"
M
TK
sv
—
1
05
I • I
06
-i
-dt
Dual-ln-Line
and Flat Package
OUTPUT 3
OUTPUT 4 GND
INPUT
4'
INPUT
4'
INPUT
3*
INPUT
3
13 112
D
L
<£
r<t;
2 I 3 4 5 6
7
OUTPUT
OUTPUT 2
OUTPUT!
V*
INPUT
1"
INPUT
1*
INPUT
2"
INPUT
2*
TOP VIEW
-18-