Tektronix 4921 Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

1

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TEKTRONIX

R

4921/ 4922

FLEXIBLE

DISC

MEMORY

For

4010

-

Series

Term inal

USERS

INSTRUCTION

MANUAL

Tekt ronix

,

Inc.

P.O.

Box

500

Beavert on

,

Oregon

97077

Serial

Num ber

070-1758-00

First

Print ing

JAN

1975

WARRANTY

All

Tekt ronix

product s

are

warrant ed

against

defect ive

m at erials

and

workm anship

for

one

year

.

Addit ionally

,

TEKTRONIX

Com put er

Term inals

,

Calculat ors

and

relat ed

peri pheral

equi pm ent

are

fully

warrant ed

against

any

trouble

for

the

first

90

days

.

Any

equi pm ent

trouble

occurring

to

those

TEKTRONIX

product s

during

the

90

day

peri od

will

be

repaired

by

TEKTRONIX

personnel

at

no

charge

.

Quest ions

regarding

this

warrant y

should

be

discussed

wit h

your

TEKTRONIX

sales

represent at ive

.

3

Specifications

and

price

change

privileges

reserved

.

U.S.A.

and

foreign

TEKTRONIX

product s

covered

by

U.S.

and

foreign

pat ents

and

/

or

pat ents

pending

.

TEKTRONIX

is

a

regist ered

t radem ark

of

Tekt ronix

,

Inc.

Copyright



1975

by

Tekt ronix

,

Inc.

,

Beavert on

,

Oregon

.

Printed

in

the

Unit ed

States

of

Am eri ca

.

All

rights

reserved

.

Cont ents

of

this

publicat ion

m ay

not

be

reproduced

in

any

form

wit hout

perm i ssion

of

Tekt ronix

,

Inc.

4921/ 4922

Users

TABLE

OF

CONTENTS

SECTION

1

Page Page

1-1

1-1

1-1

1-2

2-1

2-1

2-2

2-3

2-3

1-2

DESCRIPTION

INTRODUCTION

Standard

Accessories

Opt ional

Accessories

CHARACTERISTICS

Flexible

Disc

Mem ory

Tim e

Charact erist ics

Flexible

Disc

Cart ridge

Charact erist ics

Operat ing

Modes

Status

Charact er

Error

Checki ng

Writ e

Protect ion

Line

Term inat or

Data

Transfer

Rat e

Special

Considerat ions

Ot her

Syst em

Feat ures

CONTROLS

AND

INDICATORS

POWER

Swit ch

and

Indicat or

START

Swit ch

LOAD

ADDRESS

Swit ch

TRACK

BEGIN

Swit ches

CURRENT

TRACK

Indicat ors

Swit ch

1

Swit ch

2

TERMINAL

BUSY

Indicat or

DISC

BUSY

Indicat or

FILE

UNSAFE

Indicat or

DISC

ERROR

Indicat or

RESET

But t on

PROMPT

MODE

Swit ch

Manual

-

Aut o

Swit ch

CLOSE

FILE

But t on

FILE

OPEN

Indicat or

DISC

1

/

DISC

2

Swit ch

READY

Indicat ors

PROTECT

Indicat ors

DUPLICATE

But t on

BUSY

DUP

Indicat or

Rear

Panel

PHYSICAL

DIMENSIONS

ENVIRONMENTAL

SPECIFICATION

2-3

2-5

2-5

2-7

2-8

2-10

2-10

SECTION

2

OPERATION

INSTALLATION

CARTRIDGE

LOADING

CARTRIDGE

CARE

DISC

DRIVE

CARE

OPERATING

INTRODUCTION

TERMINAL

OPERATING

CONSIDERATIONS

MANUAL

OPERATION

Paper

Tape

Mode

Sect or

Mode

Transparent

Mode

Prom pt

Mode

Duplicate

Mode

PROGRAM

-

CONTROLLED

OPERATION

General

Cont rol

Com m ands

Read

/

Writ e

Com m ands

Addressing

Com m ands

Paper

Tape

Mode

Sect or

Mode

Transparent

Mode

Prom pt

Mode

Com put er

and

Com put er

Int erface

Modes

1-2

1-3

1-4

1-4

1-5

1-5

1-5

1-6

1-6

1-7

1-7

1-7

1-7

1-7

1-7

1-8

1-8

1-8

1-8

1-8

1-8

1-8

1-8

1-8

1-8

1-8

1-8

1-8

1-9

1-9

1-9

1-9

1-9

2-10

2-10

2-10

2-12

2-15

2-15

2-17

2-18

2-20

2-20

SECTION

3

SUPPLEMENTAL

INFORMATION

AC

POWER

REQUIREMENTS

3-1

AC

Power

Cord

and

Grounding

Requirem ent s

3-1

Line

Volt age

Selection

3-1

Changing

Frequency

Selection

3-2

FUSES

3-4

BELT

REPLACEMENT

3-4

CLEANING

3-4

STRAPPABLE

OPTIONS

3-5

APPENDIX

ASCII

CODE

CHART

1-9

CHANGE

INFORMATION

i

REV

.

A

,

JAN

.

1976

10

TRAE

-

ABAD

ADDRESS

ANONY

BTRAY

TEKTRONIX

U10

DOUCH

TEKTRONIX

CURRENT

TEXXX

NNNNNN

LOS

ADOS

--2

Oin

Fig

.

1-1

.

4921

and

4922

Flexible

Disc

Mem ory

Unit s

.

4921/ 4922

Users

@

4921/ 4922

Users

Sect ion

1

DESCRIPTION

INTRODUCTION

The

4921

and

4922

(

Fig

.

1-1

)

are

Flexible

Disc

Mem ory

unit s

that

provide

an

alt ernat ive

to

tape

cassett es

,

car

tridges

,

paper

tapes

,

and

card

readers

.

On

st andard

unit s

,

inform at ion

m ay

be

recorded

from

the

t erm i nal

,

from

the

com put er

,

or

bot h

.

Data

is

st ored

on

a

rotating

disc

;

st orage

and

recovery

are

sim i lar

to

recording

and

playing

m agnet ic

tape

.

The

4921

is

a

single

disc

drive

unit

,

and

the

4922

is

a

dual

disc

drive

unit

.

Operat ions

for

bot h

unit s

are

ident ical

except

for

the

added

capabilit ies

of

the

dual

disc

drive

unit

;

references

to

disc

2

do

not

apply

to

the

4921

.

which

prot ect s

it

during

handling

,

operat ion

,

and

st orage

.

The

disc

and

envelope

together

are

called

the

Flexible

Disc

Cart ridge

.

The

disc

is

vert ically

m ount ed

in

the

drive

unit

during

operat ion

,

and

should

be

st ored

vert ically

in

a

st orage

envelope

to

prevent

dust

and

soil

from

ac

cum ulat ing

on

the

surface

of

the

disc

.

Wipe

cushions

bonded

to

the

inside

of

the

flexible

plast ic

envelope

help

to

keep

the

disc

clean

during

operat ion

.

This

m anual

provides

inform at ion

on

operat ing

the

4921/ 4922

in

a

4010

-

Series

Term inal

environm ent

.

In

addit ion

,

inform at ion

on

operat ing

the

device

wit h

the

Tekt ronix

31

Calculat or

is

found

in

the

4921/ 4922

(

Opt ion

4

)

Flexible

Disc

Mem ory

for

"

31

"

Calculat or

Envi ronm ent

Users

Manual

.

Each

disc

has

64

tracks

(

00-63

)

,

wit h

32

sect ors

(

00-31

)

in

each

track

.

Each

sect or

cont ains

128

eight

-

bit

byt es

,

for

a

tot al

disc

capacit y

of

262,144

byt es

(

2,097,152

bit s

)

of

dat a

st orage

.

During

recording

,

inform at ion

is

inserted

int o

a

"

file

"

,

which

m ay

encom pass

any

num ber

of

sect ors

and

tracks

.

(

A

file

is

ident ified

as

all

inform at ion

between

the

st art

of

a

recording

and

an

end

-

of

-

file

com m and

;

the

end

-

of

-

file

com m and

m ay

be

program m ed

or

m anually

inserted

.

)

Data

prot ect ion

is

provided

in

the

unit

;

recor

ding

and

playback

error

detect ion

are

st andard

feat ures

.

Service

inform at ion

on

the

Flexible

Disc

Mem ory

is

divided

int o

two

basic

areas

.

These

are

the

basic

Flexible

Disc

Mem ory

unit

(

including

the

st andard

circuit

boards

,

the

drive

unit

,

and

power

supply

)

,

and

the

int erfaces

between

the

Flexible

Disc

Mem ory

and

another

device

.

Therefore

,

to

provide

com plete

service

on

the

Flexible

Disc

Mem ory

,

it

is

necessary

to

refer

to

the

Flexible

Disc

Mem ory

Service

Manual

and

to

one

or

m ore

of

the

int erface

m anuals

,

depending

on

the

device

(

s

)

wit h

which

it

is

being

used

.

The

m anuals

are

as

follows

:

The

Flexible

Disc

Mem ori es

operat e

in

three

basic

m odes

-

Paper

Tape

,

Sect or

,

and

Transparent

.

In

addi

tion

,

Prom pt

Mode

(

a

subset

of

Paper

Tape

Mode

)

can

be

selected

from

the

front

panel

.

All

m odes

are

fully

explain

ed

lat er

in

this

m anual

.

The

st andard

Flexible

Disc

Mem ory

unit

int erfaces

to

any

Tekt ronix

4010

-

Series

t erm i nal

,

and

through

the

t erm i nal

to

a

com put er

(

Fig

.

1-2

)

.

Standard

Accessories

Users

Manual

for

4010

-

Series

Term inal

Envi ronm ent

070-1758-00

4921/ 4922

Flexible

Disc

Mem ory

Unit

Service

Manual

070-1825-00

1

Flexible

Disc

Cart ridge

(

119-0666-00

)

per

drive

unit

021-0144-00

4010

-

Series

Term inal

Int erface

1

Writ e

Protect

tab

(

214-2207-00

)

per

drive

unit

for

4921/ 4922

Flexible

Disc

Mem ory

Inst ruct ion

Manual

070-1898-00

021-0156-00

"

31

"

Calculat or

Int erface

Opt ional

Accessories

4921/ 4922

Flexible

Disc

Mem ory

Unit

for

4921/ 4922

(

Opt ion

4

)

Flexible

Disc

Mem ory

Inst ruct ion

Manual

070-1829-00

Service

Manual

070-1825-00

021-0144-00

4010

-

Series

Term inal

Int erface

The

Flexible

Disc

on

which

dat a

is

st ored

is

a

flat

disc

com posed

of

a

Mylar

base

coated

wit h

a

m agnet ic

oxide

.

It

is

perm anent ly

encased

in

a

flexible

plast ic

envelope

,

for

4921/ 4922

Flexible

Disc

Mem ory

Unit

Inst ruct ion

Manual

070-1898-00

1-1

Description

-

4921

/

4922

Users

TERMINAL

COMPUTER

OD

D1015

00

DUD

 

HITTI

I

19

nu

AS

FLEXIBLE

DISC

MEMORY

DOLED

COBETO







fe

O

@

:::

.

33

Com m unicat ion

Link

Data

Com m unicat ions

Int erface

Term inal

to

-

Disc

Int erface

1758-1

Fig

.

1-2

.

Standard

Flexible

Disc

Mem ory

posit ion

in

a

4010

-

series

t erm i nal

syst em

.

Addit ional

Flexible

Disc

Cart ridges

TABLE

1-1

Tim e

Charact erist ics

Package

of

5

119-0666-01

Package

of

10

119-0666-02

Disc

Rot at ion

Speed

375

RPM

Tim e

per

Revolut ion

160

m s

Track

to

Track

Access

Tim e

15

m s

,

plus

5

m s

head

sett ling

t im e

at

the

ad

dressed

track

.

Maxim um

Track

Access

Tim e

945

m s

,

plus

5

m s

set

tling

t im e

Head

Load

Tim e

40

m s

m inim um

Addit ional

Writ e

Protect

Tabs

Package

of

20

214-2207-01

CHARACTERISTICS

TABLE

1-2

Cart ridge

Charact erist ics

Cart ridge

Size

Flexible

Disc

Mem ory

Tim e

Charact erist ics

Table

1-1

sum m ari zes

the

t im e

characterist ics

of

the

Flexible

Disc

Mem ory

unit s

.

Disc

Size

Tracks

per

Disc

Sect ors

per

Track

Sect or

Capacit y

Bytes

per

Disc

(

8

-

bit

byt es

)

Bits

per

Disc

Recording

Mode

Recording

Densit y

8

inches

x

8

inches

x

1/ 16

inch

thick

7.5

inch

di am eter

64

32

128

eight

-

bit

dat a

byt es

262,144

2,097,152

Frequency

Modulation

3100

bit s

per

inch

Flexible

Disc

Cart ridge

Charact erist ics

Table

1-2

sum m ari zes

the

characterist ics

of

the

disc

m edia

used

in

the

Flexible

Disc

Mem ory

unit s

.

The

configurat ion

of

the

disc

is

shown

in

Fig

.

1-3

.

1-2

@

Description

-

4921

/

4922

Users

Keying

not ch

Sect or

holes

(

32

)

O

O

o

O

o

O

O

Index

/

Sect or

access

hole

Track

00

07

To

lo

.

01

Read

/

Writ e

head

opening

TO

1

1

10

01

!

10

Track

63

O

Opening

for

driving

hub

lo

Index

hole

Plastic

envelope

1758-2

Fig

.

1-3

.

Disc

cart ridge

and

disc

configurat ion

.

Writ e

Operat ing

Modes

The

three

basic

operat ing

m odes

are

out lined

in

Table

1-3

.

Details

regarding

these

m odes

can

be

found

in

the

Operat ion

Sect ion

.

Writ e

File

if

accessed

m anually

;

Writ e

Sect or

or

File

if

accessed

from

Program

Cont rol

,

dependent

upon

dat a

cont ained

in

Writ e

com

m and

.

Writ e

can

be

int errupt ed

by

DC4

,

which

returns

it

to

Writ e

Enable

Status

.

1

TABLE

1-3

Operat ing

Modes

Operat ion

Feat ures

Duplicate

Paper

Tape

Mode

Feat ure

of

4922

only

.

Front

Panel

Cont rolled

.

Perm it s

m ak ing

iden

tical

copy

of

disc

1

on

disc

2

.

Em ulat es

a

Paper

tape

reader

perforat or

;

unit

act s

on

cont rol

com m ands

cont ained

in

dat a

be

ing

processed

.

Transparent

Mode

Provides

Read

and

Writ e

Operat ions

of

Sect or

or

File

.

Read

Enable

Perm it s

unit

to

read

in

response

to

Front

-

panel

START

or

program

DC1

.

Read

Read

Accessed

by

any

Read

com m and

.

Read

to

end

of

sect or

or

file

,

dependent

on

com m and

received

.

Once

ent ered

,

unit

ignores

com

m ands

from

out side

sources

;

reads

and

t ransm it s

dat a

wit hout

decoding

it

until

end

of

sect or

or

file

is

reached

.

Reads

file

if

accessed

m anually

in

Paper

Tape

Mode

;

reads

eit her

File

or

Sect or

if

accessed

from

Program

Cont rol

,

dependent

upon

dat a

cont ained

in

Read

com m and

.

Read

can

be

int errupt ed

by

DC3

,

which

returns

it

to

Read

Enable

Status

.

Read

can

also

be

in

terrupt ed

by

program m ed

CR

if

Front

Panel

PROMPT

MODE

swit ch

is

on

.

Read

cont inues

aft er

Prom pt

Charact er

is

received

.

Writ e

Accessed

by

any

Writ e

com m and

.

Writ es

until

end

of

sect or

if

Writ e

Sect or

was

sent

,

and

then

returns

to

Transparent

Mode

.

Writ es

until

CLOSE

FILE

but t on

on

unit

is

pressed

or

until

end

of

disc

is

reached

,

if

Writ e

File

was

received

.

Will

not

decode

or

ot herwise

act

on

dat a

(

com m ands

)

during

Writ e

Operat ion

.

Writ e

Enable

Perm it s

unit

to

write

in

response

to

Front

-

Panel

START

or

program

DC2

.

1-3

Description



4921

/

4922

Users

Sect or

Mode

Read

and

Writ e

Operat ions

are

lim it ed

to

one

sect or

at

a

t im e

,

regardless

of

whet her

a

file

or

sect or

com m and

is

received

.

Parit y

Error

.

Each

character

is

Parit y

checked

as

it

is

received

from

the

Term inal

or

Com put er

.

Even

though

a

character

cont ains

an

error

,

it

is

writt en

on

the

disc

and

(

unless

the

sect or

is

rewrit t en

)

the

error

will

be

read

back

during

a

Read

rat ion

.

When

an

error

is

detect ed

,

the

parit y

error

bit

of

the

st at us

character

is

set

to

one

.

Read

Sect or

Accessed

by

any

Read

com m and

;

once

enabled

,

reads

to

end

of

sect or

(

regardless

of

which

Read

Com m and

was

received

)

and

returns

to

Sect or

Mode

.

Unit

t ransm it s

all

dat a

and

ignores

all

cont rol

com m ands

(

regardless

of

source

)

during

Read

Sect or

Operat ion

.

Parit y

Error

checking

m ay

be

set

for

even

parit y

,

odd

parit y

,

or

disabled

,

and

is

cont rolled

by

a

st rap

on

one

of

the

int erface

cards

.

Refer

to

Strappable

Opt ions

in

Sect ion

3

of

this

m anual

for

a

descript ion

of

the

operat ion

of

this

st rap

in

the

various

Flexible

Disc

Mem ory

options

.

Writ e

Sect or

Accessed

by

a

Writ e

com m and

.

Once

enabled

,

condit ion

rem ai ns

until

128

characters

are

writt en

int o

the

input

buffers

(

end

of

sec

tor

)

regardless

of

which

Writ e

com m and

was

received

,

and

the

file

is

then

closed

.

Unit

records

all

dat a

wit hout

decoding

any

cont rol

com m ands

during

Writ e

Sect or

Operat ion

Checksum

Error

.

This

error

check

occurs

in

Sect or

or

Transparent

Mode

only

.

When

enabled

(

a

cut

-

st rap

on

the

Disc

-

to

-

Term inal

card

can

be

cut

to

disable

this

check

)

an

ent ire

sect or

of

dat a

(

128

characters

)

sent

by

the

com put er

is

checked

.

A

seven

-

bit

accum ulat or

st arts

a

sect or

set

to

all

zeros

.

As

dat a

is

received

,

the

7

least

significant

bit s

are

added

to

the

accum ulat or

using

an

end

around

carry

.

*

The

128t h

character

m ust

be

a

checksum

,

which

will

cause

the

accum ulat or

to

be

all

ones

.

If

the

128t h

character

does

not

cause

all

ones

in

the

accum ulat or

,

the

parit y

error

bit

of

the

st at us

character

is

set

.

I

Disc

Error

.

Disc

Error

checking

occurs

during

a

Writ e

(

to

disc

)

Operat ion

or

a

Read

(

from

disc

)

Operat ion

.

These

errors

m ay

be

caused

by

a

defect

in

the

disc

,

by

a

dam aged

disc

,

or

by

dust

or

im purit ies

on

the

Read

/

Writ e

head

.

Status

Charact er

A

st at us

character

is

sent

by

the

unit

upon

receipt

of

a

Send

Status

com m and

from

the

t erm i nal

or

com put er

.

The

first

six

bit s

of

that

character

cont ain

inform at ion

as

list ed

in

Table

1-4

,

Error

bit s

(

bit s

5

and

6

)

are

reset

aft er

t ransm ission

.

Disc

Error

Checki ng

m ay

be

disabled

by

st raps

on

the

Buffer

Cont rol

card

to

operat e

at

higher

baud

rat es

(

see

the

Buffer

Cont rol

card

st raps

)

.

TABLE

1-4

Status

Charact er

Bit

Assignm ent s

I

Charact er

Bit

Status

Inform at ion

indicat ed

by

True

Bit

Bit

1

(

LSB

)

Bit

2

Bit

3

Bit

4

Bit

5

Bit

6

Bit

7

Bit

8

Disc

1

Ready

Disc

1

Writ e

-

prot ect ed

Disc

2

Ready

(

4922

only

)

Disc

2

Writ e

-

prot ect ed

(

4922

only

)

Parit y

Error

or

Checksum

Error

Disc

Error

(

during

Read

or

Writ e

)

Redundant

(

com plem ent

of

Bit

6

)

Not

used

as

st at us

indicat or

(

Parit y

Bit

)

During

a

Writ e

Operat ion

,

the

buffer

cont ent s

are

writt en

on

the

disc

,

but

st ill

rem ai n

in

the

buffer

.

A

Read

Aft er

-

Writ e

sequence

then

occurs

to

com pare

the

dat a

just

writt en

on

the

disc

to

the

dat a

st ill

in

the

buffer

.

If

an

erroris

detect ed

during

the

Read

-

Aft er

-

Writ e

sequence

,

the

dat a

is

writt en

again

and

another

Read

-

Aft er

-

Writ e

occurs

.

If

the

error

persists

,

the

dat a

rem ai ns

on

the

disc

but

the

Disc

Error

bit

of

the

st at us

character

is

set

to

one

,

and

the

DISC

ERROR

light

on

the

front

panel

light s

.

Error

Checki ng

The

Flexible

Disc

Mem ory

unit s

accom pli sh

two

types

of

error

checking

.

These

are

Received

Data

Error

check

ing

and

Disc

Error

checking

.

Received

Data

Error

check

ing

includes

Parit y

Error

checking

and

Checksum

Error

checking

;

this

checks

dat a

as

it

arrives

from

the

com put er

or

t erm i nal

.

Disc

Error

checking

checks

for

errors

during

Read

and

Writ e

Operat ions

wit hin

the

Flexible

Disc

drive

unit

.

During

a

Read

Operat ion

,

the

error

check

occurs

aft er

the

sect or

being

read

is

placed

in

the

buffer

.

If

an

error

is

detect ed

,

the

dat a

is

read

and

checked

again

,

up

to

a

tot al

of

four

t im es

.

If

the

error

persists

aft er

the

fourt h

read

,

the

dat a

is

t ransm it ted

.

However

,

the

Disc

Error

bit

of

the

Status

Charact er

is

set

true

and

the

front

panel

DISC

ERROR

light

turns

on

.

*

In

end

-

around

addit ion

,

when

two

seven

digit

binary

num bers

are

added

and

the

sum

is

an

eight

digit

num ber

(

i.e.

,

0101010+

1101010

=

10010100

)

,

the

eight h

digit

is

m oved

to

the

first

digit

colum n

and

is

added

there

(

i.e.

,

0101010

+

1101010

=

0010101

)

.

1-4

REV.A

,

JAN

.

1976

Description



4921

/

4922

Users

Read

Operat ions

.

6400

baud

m axi m um

(

average

)

,

cont inuous

asynchronous

.

Writ e

-

Protect ion

Writ e

-

Protect

tabs

m ay

be

at t ached

to

the

disc

car

tridge

to

prevent

dat a

on

the

disc

from

being

writt en

over

,

and

thereby

lost

.

When

a

write

-

prot ect ed

disc

is

inserted

in

a

disc

drive

,

the

PROTECT

indicat or

light s

and

dat a

cannot

be

writt en

from

the

buffer

to

the

disc

.

An

at t em pt ed

Writ e

Operat ion

to

a

write

-

prot ect ed

disc

will

result

in

lost

dat a

.

The

soft ware

-

act ivat ed

st at us

character

cont ains

Writ e

-

Protect

inform at ion

for

use

by

a

program

.

Flagged

Operat ion

.

If

the

t erm i nal

-

to

-

com put er

int er

face

is

flagged

,

the

flagging

cont rols

the

dat a

transfer

rat e

.

Great ly

increased

dat a

rat e

m ay

be

obt ained

by

1

)

disabling

disc

error

checking

and

2

)

transferring

dat a

at

the

m inim um

rat e

specified

in

Table

1-5

.

If

the

dat a

transfer

is

slower

than

specified

in

the

Table

,

then

the

act ual

dat a

rat e

will

be

reduced

.

However

,

the

4921

or

4922

will

st ill

function

at

slow

rat es

like

300

baud

.

Line

Term inat or

TABLE

1-5

The

Line

Term inat or

is

an

out put

from

the

Flexible

Disc

Mem ory

that

not ifies

the

com put er

when

a

disc

function

is

com pleted

.

It

m ay

be

one

or

two

characters

,

depending

on

the

requi rem ent s

of

the

syst em

in

which

the

unit

is

used

.

The

availabilit y

of

the

Line

Term inat or

and

the

m ethod

of

det erm i ni ng

the

character

(

s

)

is

described

under

Strap

pable

Opt ions

in

Sect ion

3.

The

Line

Term inat or

is

sent

at

the

following

t im es

:

Sect ors

per

Revolut ion

8

4

N

w

1

Mini m um

Baud

Rat e

(

to

achieve

m axi m um

dat a

transfer

rat e

,

10

-

bit

byt es

)

1

)

Im m edi at ely

following

the

Status

Charact er

when

Disc

Status

has

been

request ed

.

92,000

37,700

17,300

8,300

2

)

When

reading

dat a

from

the

disc

in

Prom pt

Mode

and

a

CR

is

read

,

CR

is

suppressed

and

the

Line

Term inat or

is

sent

.

Inst rum ent s

wit h

serial

num bers

beginning

wit h

B01

and

BO2

are

set

,

when

shipped

,

for

one

sect or

per

revolution

.

Inst rum ent s

wit h

serial

num bers

beginning

wit h

BO3

are

set

,

when

shipped

,

for

8

sect ors

per

revolution

.

3

)

At

the

end

of

a

Disc

-

to

-

Term inal

or

Term inal

-

to

Disc

transfer

that

was

com m anded

by

the

com

put er

,

and

from

which

the

com put er

was

excluded

.

On

a

Term inal

-

to

-

Disc

transfer

(

from

which

the

com put er

was

excluded

)

the

Close

File

com m and

m ust

be

given

by

the

operat or

from

the

keyboard

.

This

closes

the

file

and

sends

the

Line

Term inat or

to

the

com put er

.

NOTE

Changing

from

one

sect or

per

revolution

to

8

,

4

,

or

2

sect ors

per

revolution

causes

incom pat ibili ty

of

dat a

discs

because

the

dat a

is

located

physically

in

different

locations

on

the

disc

cart ridge

.

a

4

)

In

the

event

the

com put er

com m ands

another

peripheral

to

write

to

the

Disc

,

the

peripheral

m ust

com m and

a

Close

File

so

that

the

Line

Term inat ori s

sent

.

Ot herwise

the

com put er

will

have

no

way

of

knowing

that

the

peripheral

has

com pleted

writing

to

the

disc

.

If

the

peripheral

cannot

com m and

a

close

file

,

the

operat or

will

have

to

send

the

Close

File

com m and

from

the

Term inal

keyboard

;

as

is

done

following

a

Term inal

-

to

-

Disc

transfer

opera

tion

.

Convert ing

Data

From

One

Form at

To

Anot her

.

For

exam ple

,

if

you

have

a

num ber

of

disc

cart ridges

that

have

been

recorded

using

a

one

sect or

per

revolution

form at

and

you

desire

to

convert

the

dat a

to

the

8

sect or

per

revolution

form at

,

use

the

following

procedure

:

1

)

Use

a

4922

as

it

cont ains

Disc

1

and

Disc

2

operat ion

.

Strap

Disc

1

Buffer

Cont rol

card

for

one

sect or

per

revolution

(

the

present

form at

of

the

dat a

on

the

dat a

disc

cart ridge

)

.

5

)

At

the

end

of

every

Read

File

Operat ion

,

unless

the

End

of

Read

File

Term inat or

Strap

is

cut

.

2

)

Strap

Disc

2

Buffer

Cont rol

card

for

8

sect ors

per

revolution

(

the

new

dat a

form at

)

.

Data

Transfer

Rat e

Writ e

Operat ions

.

1200

baud

m axi m um

,

cont inuous

asynchronous

.

3

)

Place

a

disc

cart ridge

recorded

wit h

the

old

form at

in

Disc

1

.

1-5

REV

.

A

,

JAN

.

1976

Description

-

4921

/

4922

Users

4

)

Place

a

blank

Disc

cart ridge

in

Disc

2

.

face

t ransm it s

one

character

(

unpredictable

as

to

which

character

)

prior

to

the

Line

Term inat or

.

The

soft ware

m ust

take

this

ext raneous

character

int o

account

,

or

else

the

com put er

will

not

recognize

the

Line

Term inat or

.

5

)

Perform

a

Duplicate

operat ion

.

6

)

Disc

2

now

has

the

dat a

st ored

in

the

new

form at

.

7

)

Convert

all

ot her

Discs

to

the

new

form at

.

Ot her

Syst em

Feat ures

Echoplex

Suppression

.

The

4921/ 4922

Status

character

is

sent

following

a

Send

Status

Cont rol

com

m and

(

ESC

7

1

)

.

The

m eaning

of

each

of

the

Status

character

bit s

is

as

follows

:

8

)

Change

the

st raps

on

Disc

1

Buffer

Cont rol

card

to

8

sect ors

per

revolution

(

the

new

dat a

form at

)

.

9

)

Conversion

is

now

com plete

.

Use

only

Disc

car

tridges

wit h

the

8

sect ors

per

revolution

dat a

form at

.

Bit

1

Bit

2

Bit

3

Bit

4

Bit

5

Bit

6

Bit

7

Disc

1

Ready

Disc

1

Writ e

-

Protect ed

Disc

2

Ready

(

in

4922

only

)

Disc

2

Writ e

-

Protect ed

(

in

4922

only

)

Parit y

or

Checksum

error

.

Disc

Error

,

Read

or

Writ e

.

Redundant

(

Com plem ent

of

Bit

6

)

The

4921/ 4922

will

issue

the

Line

Term inat or

(

one

or

two

user

-

definable

characters

)

im m edi at ely

following

the

Status

character

.

Special

Considerat ions

1

)

If

the

user

wishes

to

sequent ially

write

sect ors

wit h

few

characters

(

for

exam ple

,

10

characters

per

sect or

)

,

then

special

care

m ust

be

taken

not

to

overflow

the

buffers

and

lose

dat a

.

Unless

in

Sect or

Mode

,

dat a

loss

m ay

be

prevent ed

by

request ing

st at us

aft er

writing

in

a

sect or

.

The

st at us

character

will

not

be

returned

until

the

Writ e

Operat ion

is

com plete

.

It

is

then

safe

to

write

the

next

sect or

.

a

The

Term inal

-

to

-

Disc

card

will

prevent

the

Term inal

from

displaying

this

Status

character

unless

the

Term inal

is

in

Graphic

Plot

m ode

or

the

LOCAL

swit ch

is

act ivat ed

.

Only

a

Term inal

Busy

condit ion

(

TBUSY

)

will

disable

this

suppression

.

TBUSY

is

act ivat ed

by

any

of

the

non

printing

characters

BEL

,

BS

,

CR

,

HT

,

LF

,

US

or

VT

;

hence

one

of

these

characters

should

be

included

in

the

Line

Term inat or

.

Refer

to

Sect ion

3

for

inform at ion

regarding

the

sett ing

of

the

Line

Term inat or

.

2

)

Data

transfer

rat es

higher

than

1200

baud

m ay

be

used

by

following

the

above

procedure

,

that

is

:

write

one

sect or

,

request

st at us

,

wait

for

st at us

to

be

returned

,

then

write

the

next

sect or

,

etc.

NOTE

3

)

When

using

the

Flexible

Disc

Mem ory

in

conjunc

tion

wit h

a

t erm i nal

that

has

a

TTY

port

int erface

,

the

following

m ust

be

considered

:

On

a

Writ e

Operat ion

from

which

the

com put er

is

excluded

(

Term inal

Only

)

,

a

Line

Term inat or

is

norm ally

sent

to

the

com put er

at

the

end

of

the

Writ e

Operat ion

.

In

this

configurat ion

,

however

,

the

TTY

port

int er

Local

Echo

or

Com put er

Echo

of

one

of

the

above

characters

should

be

provided

to

prevent

dat a

handling

problem s

.

1-6

REV

.

A

,

JAN

.

1976