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8155/'156/8155-2/8156-2
8085A MINIMUM
SYSTEM CONFIGURATION
Figure
11
shows a minimum system using three chips,
containing:
• 256 Bytes RAM'
• 2K Bytes ROM
•
381/0
Pins
• 1 Interval Timer
• 4 Interrupt Levels
A8-1S
ADO-7
ALE
B085A
RD
WR
101M
ClK
RESET
DUTt
READY
,
,
,
,-
,
RESET
I TIMER
I IN
WR
AD
ALE
CE"
7
G
~
'-l
LATCHES
T~~~R_
'--'--
I
~
CONTROL
256 x 8
RAM
8156
-
l
101M
I
I
~~cp$
- NOTE, OPTIONAL CONNECTIONS
B.
B
B
"
Figure 11. 808SA Minimum System Conllguratlon. (Memory Mapped
1/0)
6-90
"
"-
---.!.
;..
v
-
VCC
-
vv~
-
-
-
-
-
1
Vee
,
7:~~<;
7~~
_101
iIDiOvi
,
CE
M
ALE
elK
RS~RDY
8355 J ROM
...
I/O I
OR
8755 I
PROM
+
lID
I
B
B