Intel 8080 manual DalN-t?!NrJ, 1G~D L-~

SCHOTTKY BIPOLAR 8212

(See Note 1)

AO - '

8080		A1 --+-		:: -	ST;~;T:¢ST:212 tt:7:::~~llllltnn~	8212	=> ~:~~T
		~ --0 E2
ADDRESS .:...		A2 --+-	8205	::=:-
BUS		~ ~ E1
		Vee- ..E3__..			~;:N~~- :IIII[_~L~ee?
		I/O DEVICE
		SELECTOR
		INP --......---- t - t - t - t - t - + -- + - t ------------ + - 6
					STROBE 2 --- .STB
					INPUT ~		~ OUTPUT
STATUS					PORT 2 L-Y8212	8212
BITS	-						W PORT 2

~ CLR

_ OUT ----t------r-t-t-t-t----ir+-t-----------+--+----1~:::::f_4

INT --------004----------1

ST;;;;T::: ST:212

m::ili::~Jtmm:~

8212

r-

- ,

_----L.-,I-<~J11INT CLR 0-<1

-Y[[~\!

. : CLR

. 1G~D L - _

,_-.J Vee

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:::[:[

BUFFERED

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DATA

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BUS

Vee I

STROBE 4 -- .STB

Ill::

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8212

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1 IO-++++-.-.....~

PORT 4 L.-,I

8212

ttm::zb ill\:,z:Zht~

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~

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0 '1IO-++++----4~

INPUT ~

8080 -- ... J ..

8212

~

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2 1O-++++---oIt--

y ~f

y

D:J:~!I.

8212

~ H

3 IO-++++-.....-~

-

~

4 1O-++++---oIt ---------<:::JIINT CLR ~

_~L:ee

=:

~

1G~D L-~

:111

-

--I

5 1O-++++---oIt--_

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................

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:::::

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ST;~;;~¢

ST:212

~m:~~j!II!:w::7::~3

8212

GND

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L __ II_ ..I

~OUTPUT

W PORT 3

Y

~OUTPUT

W PORT 4

y

t> ~~~~~T

	INTERRUPT		~~~~~_.		I!!!!	-~~eI
8212	INSTRUCTION		ST;;;;T:¢	ST:2~::::::::::::::::::::::~~II::::::::::::::::::::?			8212	hi" PORT 6
u +--.s>	PORT (RST)	INTERRUPT
		I
		PRIORITY
		ENCODER &						~ OUTPUT
GND	GENERATING
INT ----- .. ---- t:	LOGIC CIRCUITS		.......------<=.11 INT CLR ~~		:~:~:	~	CLR
BUS DRIVER	(USER DESIGNED)			1G~D L - _	\l~\l	-~ Vee I
ACK
BI-DI RECTIONAL
			STROBE 7 ---+-	STB
				8212			8212	~OUTPUT
								W PORT 7

SYSTEM--.....-

RESET

Note 1. This basic I/O configuration for the 8080 can be expanded to 256 input devices and 256 output devices all using 8212 and the appropriate decoding.

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