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SILICON GATE MOS
8251
APPLICATIONS OF THE
8251
ADDRESS BUS
ADDRESS BUS
CONTROL BUS
CONTROL BUS
DATA
BUS
DATA
BUS
r----'
I
EIA TO TTL
:.
QJ)
I
CONVERT I
PHONE
(OPT)
8251
L
____
J
::
ASYNC
LINE
MODEM
INTER·
BAUD
RATE
CRT
FACE
TxC
GENERATOR
TERMINAL
8251
Asynchronous Serial Interface
to
CRT Terminal,
DC-9600 Baud
Asynchronous Interface
to
Telephone Lines
TELEPHONE
LINE
ADDRESS
BUS
L.-
.....
SYNCHRONOUS
TERMINAL
OR PERIPHERAL
DEVICE
SYNDET
1-----+1
Synchronous Interface
to
Terminal
or
Peripheral Device
5-143
SYNC
MODEM
Synchronous Interface
to
Telephone Lines
PHONE
LINE
INTER·
FACE
TELEPHONE
LINE