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The 8080
is
a complete 8-bit parallel, central processor
unit
(CPU)
for
use
in
general purpose digital computer
sys-
tems. It
is
fabricated on a single
LSI
chip
(see
Figure 2-1).
using
Intel's n-channel silicon gate
MaS
process. The 8080
transfers data and internal state information
via
an 8-bit,
bidirectional
3-
state Data
Bus
(00-07).
Memory and peri-
pheral device addresses are transmitted over a separate
16-
bit 3-state Address
Bus
(AO-A
15). Six timing and control
outputs (SYNC, DBIN, WAIT,WR, HLDA and INTE) eman-
ate from the 8080, while four control inputs (READY,
HOLD,
INT
and RESET), four power inputs (+12v,
+!5v,
-5v, and
GND)
and two clock inputs
(<1>1
and
<1>2)
are
ac-
cepted by the 8080.
Figure
2-1.8080
Photomicrograph With Pin Designations
2-1
A,O 1
GNO
2
0
4
3
Os 4
0
6
0.-.5
07
6
0
3
7
O
2
8
0,0
9
DO
0 10
-5V
11
RESET
12
HOLD
13
INT
14
¢2
15
INTE
0
16
DBIN
0 17
WR 18
SYNC
19
+5V
20
40
39
38
37
36
35
34
INTE~
33
32
8080
31
30
29
28
27
26
25
24
23
22
21
A"
A
14
A'3
A'2
o
A,s
o A
g
As
o A
7
A
6
As
o A
4
A
3
+12V
A
2
A,
A
o
WAIT
READY
tp,
HLOA