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SERIAL

PORT

The

Clock

source for

the

serial

port

is

as follows

(selection

is

via

DTR

and

R TS bits of

channel

B):

DTR, RTS

o

Output

clock 1 from 8253

to

RxC &

output

clock 2

to

TxC

1 RxC

and

TxC

driven from

line

clock

2 RxC

and

TxC

driven from

output

clock of 8253

timer

3 RxC

and

TxC

at

Ov

Modem

Control

Through

The

AUX Device

When

Modem

Control

is selected,

the

user

has control

over

the

following:

RTS

DTR

Transmit

Enable

Receive Enable

And can

monitor

the

state

of

RTS

DTR

Transmit

Enable

Receive Enable

DSR

CTS

DCD

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Service Manual305 pages