Computer Hardware

Spectra 70

RCA Spectra 70 Training Manual

63 pages

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PRINTER

Control

Byte

;!

l =

COUNT

23

2

1

o

1

NOT USED

Examples

of Write Control

Advance

the

paper

up

to

fifteen

single

spaces,

or

selection

of

Paper

Tape

Loop

Channel

(1-11)

.

Paper

advance

following

next

print

action.

Paper

advance

immediately.

Paper

advance

by

2

0

-22

count.

Paper

advance

by

Paper

Tape

Loop

as

selected

by

the

2

0

-22

count.

Assuming

the

following

bytes

in

memory:

CTL1

CTL2

CTL3

00000001

00001000

01000010

(01)16

(08h6

(C2)r

6

The

instructions:

(Base

Addresses

implied)

NAME

OPERATION

OPERAND

WRC

1(1) ,

CTL1,

CTL1

WRC

4(3) ,

CTL2,

CTL2

WRC

3(1),

CTL3,

CTL3

will:

51

1.

Select

Output

Stacker

#1

on

the

Card

Reader

2.

Unwind

one

gap

on

Magnetic

Tape

3

3.

Advance

the

paper

on

the

printer

two

lines

im-

mediately.

ERROR

RECOGNITION

An

error

condition

that

develops

during

the

execution

of

an

I/O

instruction

does

not

halt

the

computer.

If

the

selected

device

is

busy

the

instruction

is

~

staticized

until

the

device

is

available.

I/O

instruc-

tions

set

the

Condition

Code

to

one

of

three

conditions.

If

the

device

is

inoperable,

the

instruction

terminates

and

the

Condition

Code

is

set

to

one

(1).

If

the

in-

struction

has

been

accepted

for

execution

by

the

Con-

trol

Electronics,

the

Condition

Code

is

set

to

zero

(0),

and

the

normal

mode

is

free

to

staticize

the

next

instruction

in

sequence.

If

an

interrupt

is

pending

on

a

device,

and

an

instruction

selects

that

device,

the

instruction

terminates

and

the

Condition

Code

is

set

to

(2).

Note:

If

inter

rupt

is

inhibited

on

an

I/O

channel,

the

termination

interrupt

generated

by

the

end

of

a

command

using

that

channel,

will

be

pending

and

the

channel

will

remain

busy

until

a

Post

Status

Instruction

resets

the

busy

bit

in

the

Control

Electronics.

Table of Contents

Other manuals for RCA Spectra 70

Reference Manual260 pages

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RCA Spectra 70 Specifications

General

Brand	RCA
Model	Spectra 70
Category	Computer Hardware
Language	English

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