Gtc Sw10 User manual

=

-

SW10

MAINTENANCE

MANUAL

SW10

MAINTENANCE

MANUAL

GTC

PN

970005-001

PRINTING:

MAY

1982

Q'.P!RlIHr

1981.

GIWW..

'.i'iRllllll

CDIOWl.'D

14831

mtm.lN

AVE.

'nB!'JN,

m.

921;8'-7282

(714)

730-1123

11« 918-595-2428

All

rights

reserval

R>

µu:t

Of

this

J;d>lication

may

be reproclloed

in

aJ¥

ferro

withrut

written

pemlission

fran

GerEral Temrl.ral

Cccporatim.

'llle

followirg

available

from

G'.IC:

00.0 users

Man.Jal

000

Reference

cara

W MJnitor

Man.Jal

m 970004-001

m 97000&-001

PN

05018-001

'1he

naterial

in

this

marual.

is

for

infornation

pJqX>SeS

ooly. 'llle oontents

am

the

prod.Jct

it

describes

are

s:bjed:

to

dlarlge

withrut

ooti~

General

Terminal.

Cccporatioo makes no

repreSSltation

or

warranties

with

r~

to

this

marual..

Printed

in

IBA

Sectiai

1.0

1.1

2.0

2.1

2.2

2.3

2.4

2.5

2.5.1

2.5.2

3.0

3.1

3.1.1

3.1.2

3.1.3

3.1.4

3.2

3.2.1

3.2.2

3.2.3

3.2.4

3.3

lN'JR)[IJCI'I(N

•••••••••••••••••••••••••••••

1-1

GENENAL

I!BClUPrICll

••••••••••••••••••••••

1-1

Tml'1l{;

&TESI.'AIIlS

••••••••••••••••••••••

2-1

~

AlJXlt1l\T.IC

'JIS'IS

•••••••••••••••••

2-1

OFF

LINE

CINFlDB'XE

TEB'IS

••••••••••••••••

2:-1

CN'

L1NE

~

TES'IS

••••••••••••••••••

2:-2

1il~

'Bf)-WAY'

'lml'

•••••••••••••••••••

~2

~T

~••••••••••••••••••••••••••2-2

~d

•••••••••••••••••••••••••••••••

2-2

'1'e.!'JtdrB1

Centro! Baird

•••••••••••••••••

2-3

'IHE[RY

OF

~ICNS

•••••••••••••••••••••

3-1

GENENAL

••••••••••••••••••••••••••••••••••

3-1

~a

...............................

3-1

Tenni.nal

Control

Beard

•••••••••••••••••

3-1

f.tnitcx Asaelrbly

•••••••••••••••••••••••

3-1

R:Jwer

'Itansfonners

•••••••••••••••••••••

3-1

IEmn.ED

'1HEIRY

OF

OffRl.n'ICNS

••••••••••••

3-1

Keyboard

Asaelrbly

••••••••••••••••••••••

3-1

Tenni.nal

Control

Beard

•••••••••••••••••

3-3

(1)

(2)

(3)

[

4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

[12)

(13)

Ad::lress

Init

Cira.ti.t

••••••••••••

3-3

Mi.cr~rocessor

Cira.ti.ts

•••••••••

3-3

Progrcrn

H¥:M

••••••••••••••••••••

3-S

Scratch

Pa:1

RAM.

••••••••••••••••

3-5

DispJ.a.y

mi

•••••••••••••••••••••

3-6

Video

Timer

&

Cmtroller

(V.Irc)

.3-6

5'yst.Eln

Cl..cck

••••••••••••••••••••

3-7

RoNBuffer

••••••••••••••••••••••

3-7

Video

Galerator

•••••••••••••••••

3-7

Functim

Decoder:

#2

•••••••••••••

3-9

E\nction

Decuder

tl

•••••••••••••

3-9

l'brrV'olatile Mana:y (mM)

•••••••

3-

HJ

Int:erfaoe Cira.ti.ts

••••••••••••••

3-Je

[14)

Bell

J.lrrp

••••••••••••••••••••••••

3-11

(15)

Paier

~y

••••••••••••••••••••

3-11

ltt>nitar Assalbfy

•••••••••••••••••••••••

3-12

R:Jwer

Panel

A9:1elbl.y

•••••••••••••••••••

3-12

flNEl<NIC.S

••••••••••••••••••••••••••••••••

3-13

4.0

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

5.0

Table

of

pmtmhj

DISASSEltBLY

~

••••••••••

4-1

Raoovi.n:J

the

Front

Bezel

••••••

4-1

Raroving

tre

tbm.ting

Frane•••4-2

Ramv:in:J

the

I..ogic Cmtrol

:00.4-3

Raroving

tre

CRI'

••••••••••••••

4-4

storinJ

the

CRr

•••••••••••••••

4-6

Raroving

tre

PQ./er

PaI'el.

••••••

4-7

Ramv:in:J

the

f.tnitor

ctrl.Bd

••4-8

Disasserbly

of

tre

Keyboord

•••

4-UJ

SCEEM\TICS

~rd

720002

••••••••••••••

1

sh

Tenni.nal

Control

Beard

•••••••

5

sh

6.0

O\BLE5

AND

CXNNECitRS

•••••••••••

6-1

7.0

CI«ERIN;

ANDREPAlRS

••••••••••••

7-1

7.1

Manlal.

OrderirxJ

•••••••••••••••

7-1

7.2 Parts Orderin:J

••••••••••••••••

7-1

7.3

!tens

Return:d for REpair

•••••

7-1

7.4 Parts

Lists

•••••••••••••••••••

7-3

~A

••••••••••••••••

z8

Prcxilct

SfeC

APPENDIX

B

•••••••••••••

•

VOC

Prod.let

S}?eC

APHNDlX

c••••••••

Ra-I

B.lffer

Prodlct

SfeC

APPENDIX

D

•••••••••••••••

NVM

Prcxilct

S}?eC

Figure

1-1

1-2

2-1

2-2

2-3

2-4

2-5

2-6

3-1

3-2

3-3

3-4

3-5

4-1

S-1

6-1

6-2

6-3

6-4

6-5

7-1

7-2

3.1

7.1

7.2

7.3

7.4

7.5

7.6

7.7

7.8

7.9

I.j

st;

of

Figures

and

'DR'm

List

of

Figures

SOS

~ica:tions

••••••••••••••••••••••••••••

1-1

Illustrated

Parts

Breakd:Jwn

••••••••••••••••••••

1-2

Status Line Error

Messages

•••••••••••••••••••••

2-1

'I\Jrn

AIOUl'K3

Pl~

•••••••••••••••••••••••••••••••

2-2

Cross CclJpler

cable

••••••••••••••••••••••••••••

2-2

S4l0

Inl:eif~

Co'lnectcrs

••••••••••••••••••••••

2-4

Temrl.nal.

Ca'ltrol

Board

'lest

Points

•••••••••••••

2-5

'fypical

wa.vefOIIDS

••••••••••••••••••••••••••••••

2-6

SOS

Blcx::k

D.iagran.••••••••••••••••••••••••••••3-2

KE¥board Scanning SEquen::e

•••••••••••••••••••••

3-2

'la:mirBl Ccntrol Baird

Sigml

Ela-t

D.iagran

•••••3-4

Cllaracter FoIJrat

•••••••••••••••••••••••••••••••

3-8

'le:miml. Ccntrol Beard

Ci.rant

Iooations

•••••••

3-14

Disassercbly

Proced.lres

•••••••••••••••••••••••••

4-1

Sc::b31atic:s

•••••••••••••••••••••••••••••••••••••

5-l

ConnnicationPcrts

••••••••••••••••••••••••••••

6-1

+5V

TransfoIDer

to

logic

Board

•••••••••••••••••

6-2

+lSV Tl:ansfa:mer

to

Logic

Beard.

•••••••••••••••

6-2

logic

Ban:d

to

MJnitor Ban:d

•••••••••••••••••••

6-2.

Kf¥b<Brd

to

'le:miml. cable

•••••••••••••••••••••

6-3

W:Cranty

•••••••••••••••••••••••••••••••••••••••

7-2

sne Fanily Tree

•••••••••••••••••••••••••••••••

7-3

List

of

'Il=!hl

es

J:BCl4

Enable

••••••••••••••••••••••••••••••••••••

3-5

SOS

FJNAL

~••••••••••••••••••••••••••••7-4

000

UNIT

ASSEl43LY••••••••••••••••••••••••••••·7-5

~

Ol'IOR

ASSEJeLY

•••••••••••••••••••••

7-6

D~

'IO

MAIN

BOARD

ASSEM3LY

•••••••••••••••••

7-6

~

QJi1llU..

BCJ\RD

•••••••••••••••••••••••••

7-7

RllER

PANEL

~••••••••••••••••••••••••••·7-11

KE'lBCJ\RD~

••••••••••••••••••••••••••••••

7-12

l<EYBONU)R::

BOARD

~••••••••••••••••••••·7-12

CPl'D'U\L H\RJB

•••••••••••••••••••••••••••••••••

7-13

Page

iv-----------------

I

-

L

I

\..._.

SW

10

TERMINAL

________________

Pagev

______________

_

001

Mnjnt=manre

Kmnal

'l'ahle

of

Cmt:ents

'nrls

p:lge

intentiorally

left

blank

1.1

Dl&QUJm

'Ibis

manual

is

inl:S'lded

to

be

used

l::!r'

servi~

~ED'lIEl

who

must

peifcrm

d.iagrostic

tests

on

arrl

repri.r

cf

the

000

termiml.

It

is

asst.med

that

the

tedmician

is

familiar

with

basic

data

communication

techniques

and

normal

SW10

terminal

operation.

The

following

manuals

EtlaJl.d

be

corwlted

is

conjtnction

with

this

narual:

970004~1

0501H01

Only

the

d:>mestic model

of

the

SW10

is

disa.issed

in

this

maruaJ...

Diff

erern:s

between

the

d:>mestic arrl

international

p:Mer

awlys

are

shown on schercatic

72.0019

sheet

2.

1.1

CDBRAit

JBQ1Ptl11J

The

SW10

is

a

microprocessor

(ZS)

based

terminal

with

a

detached

ANSI

keyboard.

'!be

operating

parameters

may

be

modified

by

the

q;ierator

dlrillJ

smtJP

roode.

'Ihe

terminal

allCMs

the

o~ator

to

serially

transmit

data

to

or

receive

data

fran

a

ranote

host

CPU.

The

infornation

is

pissed

OV'er

a

full

d.Iplex

chanrel

at

selectable

baud

rates

up

to

a nax.inun

of

9600t{E.

'!he 12

ird1

(diagaal.)

screen

is

arranged

in

an

80

oolumn arrl

24

row

fornat

plus

a 25th

status

line.

Each

character

is

displaya:I

as

a 5x7

d:>t

ma

tr

ix

on

a 7x10

field.

A

non-interlaced

(overlap)

scan

method

is

used

to

refresh

eadl

frame

at

a

60Hz

(or

50Hz)

rate.

InterfacillJ

is

thru

a main

:EX>rt

arrl a

printer

port.

Both

are

rear

~

RS-232C

cx:ruECtors.

'!be

printer

IX>rt

is

a

gated

IX>rt

which,

if

desired,

allows

data

received

from

the

main

:EX>rt

to

be

piSsed

thru

the

printer

:EX>rt

withrut

being

displayed

on

the

screen.

'!he

temiral

cperatirg

piraneters

are

changed

from

the

keyboard.

There

are

no

i;hysical

switches.

Figure

1-1

lists

the

changeable

parameters.

The

underline

condition

is

the

state

selected

at

tine

of

narufacture.

I

ffiYS1P'L

gww

:1p1sr11H

I

DISPIAX

KEYlpNE

IHElGfl'

11.5"

(29an)

2.5"

(6.4an)

lwmm

13" (33an) 17"

(41.an)

IIEPIH

12" (30an) 8

11

(20an)

IWEIGHI'

22

ll:s

(10kg)

4

lbs

(l.8kg)

1va..'Jl'GE'/FREO

105-135

Vac

50/60Hz 61 Watts

l'I'EMPmMURE

(C)

5

to

40

C)fer/-30

to

65

Stor

llllMIDl'IY

5%

to

80%

mn-<x>rrlensing

I

WlflAY

QJHCIWISl'llH

I

&:REEN

SlZE

I

vmmG

ARFA

I

&:REEN

CAPPCr!Y

I

DISPIAY

MMRIX

I

OCREFN

1?llEPlm

I

CH1\RPCl'ER

fFr

I

CliARlCIER

MMRIX

I

<IRDR

111\IN

um

lNIBE'Q

12"

Diagoral

8.25" x 6.25"

1920 Olaracters

EE

x

24

+ Status

P31(Gm)

or

P4

(lilt)

128

A«:;CI

I

5x7

00.

7x10

field

Rellerse Video

Blcx::k

I

RS-232C

~hroID.IS

I

Selectable

~FF

I

50

-

9600

Baud

Full

nt>lex

I

Splce/Mark/EVerv'OcH

Parity

I

JJRDDP

Rm'

DDmi'!!QS

I

RS-232CAsyrdlrax:>~

I Screen

Print

I

Printer

COntroller

~

I Haldi.es

HUN1'ER

BIBY

I

fBllP

KIE

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#01>

M)IE

#02>

BNJD

#03>

mRI'lY

N4>

KIE

#05>

AUIO

ttil

LlNE

#06>

J1J'10

WRAP

#07>

LlNE

END

NB>

cumR

!LINK

#09>

O\PS

LOCK

#10>

MAOOIN

BELL

#11>

SIIFT 3

#12>

lU\IER

FREOJmc::Y

113>

PRmr'ER

BUSY

#14>

KEYBOARD

#15>

mssmRJ

116>

lUlO

REPEAT

117>

~

PRlNl'

118>

lUlO

XCN

#19>

u:xx.

EXlD

#20>

REY

a.Ia<

#21>

fliJil

saa.r.

#22>

RBTm>E

VIDID

123>

BR1GEIINE5S

CNLINE/ra:AL

50

'IHlU

~

~MN/a:Dl

YJ!IU/\ll52fPID;RAM

I

.w'OFF I

SID~

I

.w'OFF I

CN/m:

I

.w'OFF I

J/Eta.ISH

RlJN)

J_

50/.61.

mmz

I

.I.W'HD

I

1 I

2.

I

CNLY/DISPIAY

I

.w'OFF I

CN/.W:

I

~I

CN/m

I

,W'OFF

I

CN/.W'.

I

etV.W:

I

1 'lHlU 16

(.8)

I

---------------~'

Figure

1-1 SiLI

&n;jficatj005

----------------Page

1-1

---------------

8W10

ffaintenapce

Mapual SICTIOI 1

FRONT

BEZEL

MCNITOR

FRAME

PART

.

NO

620038

PART

NO

03584-001

:l?aiER

PANEL

ASSEMBLY

NO

660021-00X

SCHEMATIC

NO

720019

PARTS

LIST

NO

660021-UOX

K~rBOARD

COV.t.R/BRZEL

PART

NO

COVER

0358'5-001

PART

NO

BRZEL

03599-uO 1

REAR

HOUSOO

PART

NO

03579-001

MONITOR

ASSEMBLY

NO

890001-00X

SCHEMATIC

APPENDIX

A

PARTS

LIST

APPENDIX

A

FLYBACK

TRANSFORMER

PART

OF

ASSY

890001-00X

TERMINAL

CONTROL

BOARD

ASSEMBLY

NO

75001

9-00X

SCHEMATIC

NO

750019

PARTS

LIST

NO

750019

M:>NITOR

CONTROL

BOARD

PART

OF

ASSY

890001-00X

~YBOARD

CABLE

KEYBOARD,

P.

C.

BOARD

PART

NO

900006

ASSEMBLY

NO

750002-00X

SCHEMATIC

NO

750002

PARTS

LIST

NO

750002

Figure

1-2,

Illustrated

Parts

Breakdown

'lhi.s

sectiai.

describes

test

procedlres

that

may

be

used

to

check

the

cperati.rxJ con:lition

of

the

terminal.

They

may

also

be

used

to

isolate

failures

to

the

tecninal,

the

modem,

or

the

transnission

lines.

2

.1

P<lq-<IJ

AD'JQIATIC '1'1§1'5

When

power

is

ai;plied the

terminal

will

~Iform

a

series

of

five

internal

diagn<Etic

test

to

determine

the

cxxrlition

of

its

OOM,

RAM,

am

NVM

circuits.

If

an

error

is

detected,

the

testing

will

stop

and

an

error

message

will

ag;:ear on

the

status

line

i.rrlicati.rxJ

the

rature

of

the

problan.

a.

l01

Wl'S

'llE

IOM

cortents

are

read out

am

a

checksum

is

calculated.

'Ibis

number

is

canpared

to

a

previously

stored

checksum.

If

the

numbers

natch,

the

test

is

success:ful..

b.

Z8

'.tmI'

A blcx:k

of

IOM

is

written

into

the

1281¥tes

of

za

PAM.

A

bit

ty

bit

cani;mioon

of

the

roM

am

RAM

is

made.

c.

RAM

1 'lml'

This

test

checks

the

condition

of

the

2K

of

display

RAM

~

writing

a block

of

roM

into

the

RAM

am

makirJJ

a

bit

l:y

bit

oo~ioon

at

each

memory

lcx:atiai..

d.

mi

2 'lffil'

'lhis

test

creeks

the

1K

of

scratch

i;ad mM. A

block

of

101

is

written

into

the

RAM

and

a

bit

~

bit

comparison

is

made

at

each memory

lcx:atim.

'llE

NIM

(mn-volatile

memory)

is

essentially

an

electrically

alterable

roM

am

is

subjEct.ed

to

the

same

tests

as

the

program IDM. The

contents

of

the

NIM

is

read

and

a

checksum

is

calculated.

This

number

is

compared

to

a

checksum

stored

in

the

NVM.

If

the

numbers

match,

the

NllM

is

axx::essful..

Fail

time a

i;araneter

is

changed

am

saved, a

r&1

dlecksum

is

calculated

an::1

sta:ed.

If

an

NlM

error

is

detected, a

set

Of

default

i;mameters

will

be

entered

into

the

NIM.

'!his

allows

the

q>erator

to

trouble-shoot

the

terminal

with

a kmwn

set

of

corrlitions. 'lhese

default

corxlitions

are

listed

in

SEction

1.

I

MESSZGE

!~~~~~~~~~~~~~~~~~

I

I Error:

I

I Error:

I

I Error:

I

RJt1

za

RAM

1

RAM

2

WM

~un

error

Error

in

128

cytes

of

za

RAM

Error

in

display

RAM

Error

in

scratch

i;ad

RAM

Error

in

mn-volatile

IlBIDry

Error

in

c:mnmications

interface

!~~~~~~~~~~~~~~~~~

Figure

2-1,

stah16

Line

Error

!!eeMgP6

2

,2

OFF

LINE

CD1FT])fR;R

TmTS

Place

the

terminal

in

the

SE'll.JP

mode

by

pressing

the

<SETUP>

key. Next,

press

the

<SHIFT>

+

<D>

keys.

This

!reds

the

terminal

with a

known

set

of

cperatirJJ

paraneters

under

which

the

unit

can

be

tested.

'lhese

i;arameters

will

be

displayed

on

the

screen.

Exit

the

SE'IUP

node l:y

pressing

the

key

again.

Mer

the

comnarXI

sequen:e

ES::

#8.

'llE

s::rem

will

be

filled

with

"E"'s.

Verify

that

each

display

lcx:ation

contains

a

character.

The

screen

may

te

cleared

l:y

pressirr3

<SUFI'>

am

<Ema'D>.

Exercise

the

tenninal

fran

the

keyboard usi.rg

all

the

up~r

and

lower

case keys,

all

the

numbers,

and

all

the

special

symbols and

punctuation

marks.

Verify

that

the

cursor

control

keys

and

the

numeric

pad

keys

are

operating

correctly.

Perform carr:iage

return,

line

feed.

tab,

etc.,

q>erations.

Enter

data

into

positiai.

00

of

line

24

to

test

for

proper

scrollirJJ cperation.

The power up

test

can

be

started

from

the

k~d

three

ways:

1.

Fran

the

SEm.JP

node,

press

<SHIFT><D.

2.

Enter

the

SSlll~

EEC

[2;ly. 'lltis

will

C"ause

the

tests

to

be

perfccned

oooe.

3.

Enter

the

sequence

ESC

[2;9y. The

test

will

run cxmtiruously.

H.'.Me7er,

m beep

will

sound

after

the

success:fUl

canpletioo

of

edl

test.

NJl'E: b conl:iruous

test

will

temirate

only

when

an

error

is

detected

or

when

p:>wer

is

renoved.

2.3

<Ii

IjINB IN.Dff'ACB

'1'1§'1'5

a.

Main

Interface '!e?ts

'lhe Main

interface

may

be

tested

by

.inst:all.ing a

tum-around

plug

(shown

in

Figure

2-2)

and

invoking

the

Data Loop-

back

confidence

test.

Entering

the

oomnen:l

~

EEC

[2;

l.0y

initiates

the

tests.

Data

is

routed

out

2 and

receivErl

tack

in

3.

b

status

line

will

display

the

message

"WAIT",

inlicati~

the

test

is

in

progress. b

test

will

continue

until

a

failure

ocairs

or

p:JWer

is

renewed. As describEd above,

a

failure

will

cause

an

error

message

to

be

displ.ayErl on

the

status

arii

the

tests

will

be

terminated.

With

the

COI'lectcr

in

pl~,

test

all

the

function and control

kE¥S-

Test

all

the

commands

listed

in

the

Users Manual

in

Section

3.3.

If

the

data

shown

on

the

screen

is

the

same

as

that

bei.~

key-Erl

in,

the

test

is

cmsidered

successful.

I~

~

lc:"JY

I I

ti

n U

11

• • • • 0 0 0 0 0 0

TD

.llD

•11

C11

....

CD

D1'R

0 0 0 0 • • • 0 . 0 • 0

M • a

Pi,gure

2-2.

Turn

Around

Plug

b.

Printer

!nterfsx:e

Tests

If

a

printer

is

attached.

the

printer

interface

may

be tested

1:¥

typing

several

lines

of

characters

on

the

s::reen

in

sane

reax]Ilizable :EBttern.

Peif

ccm

the

Print

Page

operation

ESC

[SF. Check

the

printout

to

verify

that

the

data

was

printed

exactly

as

it

appeared

on

the

&:real.

b

Print

Ccntroller

IOOde

may

be

tested

1:¥

entering

ESC

[

SF.

'Ibis

enables

the

Printer

and

disables

data

from

being

displayed

on

the

screen.

Next,

ask

the

host

to

send back some known data. '!he

data

Ehruld

not

be

displayed on

the

screen

but

should

be

sent

directly

to

the

printer.

'Ihe s::reen

is

erabl.ed (and

the

Print

Ccntroller

disabl.Erl)

qr

enteri~

an

ESC

X.

2,4

Nll'fB'IM'R 1'i0-Ji\Y

Tf§T

By

using

a

c~~ed

cable, a two-way

test

can

be

conducted

using

a

secom

terminal

to

simulate

the

host. Place

both

termirals

on-

line

and

comect

the

cable

between

the

main

ports.

Data

entered

on one keyboard

should

~

on

the

s::reen

of

the

other

temiral.

) t

TD

RO

:s

(

)

:s

RD

TD

2 (

CTS

s

) '

86

DTR20 (

66.,

<

P:Lgure

2-3-

Cross

Coupler

Cable

2,5

f'NJ[.T

IQA'flm

This

section

is

provided

to

assist

the

technician

in

isolating

a

termiral

problen

to

me

Of

the

ma.jcr

SJbassernbl.ies, i.e., keyboard,

termiral

control

balrd,

or

monitor

circuits.

Refer

to

Figure

2-8

for

location

of

the

test

points.

2.5.l

&Mnard

The keyboard

sends

KRG1

signals

to

the

microprocessor

circuits

in

response

to

KMUX

signals.

If

only

a few keys

are

inoperative

the

problem

could

be a bad

KMUX,

a bad

multiplexer, bad

k~,

er

a broken

oo~cti.on.

Each

I<MtJX

wavefccm

will

~

different

but

all

....

•irrt-mme

f!mu!ftl

RRli

signals

will

ai:pear

the

same.

'!be

I<MUX

signals

are

always present

rut

t:he

KOCW

signals

aPPear .only when a key

is

pressed.

Consult

SCfiaratic

?B02.

Figure

2-8

500ws

the

lcx:ation

Of

the

six

power

supply

test

points.

'lhese

test

points

check

the

voltages

at

t:he

rut:pit

Of

their

regilators.

If

the

desired voltage

levels

are

oot

present,

refer

to

the

:E;XMer

awly

Edlematic.

Tra~

the

val

tages

mck

towarcs

the

transfocmer

until

the

prcill.an

is

lcx:ated.

2.5.2

Tennina.l

Ccntrol

B<>ard

Whan

power

is

first

awJj.ed,

the

000

p:rla:ms

a

series

Of

internal

diagrostic

tests.

'lbese

s11:rU1J

2

tests

check

the

RAM,

RCM,

WM,

most

Of

the

microprocessor,

and a

large

portion

of

the

VTJIC.

If

a problem

is

encountered

an

error

message

will

appear on

the

status

line

inlicatinJ

the

nature

Of

the

probl.an.

'!he video

data

out:plt

Of

the

terminal oontrol

txard

can be viewed

at

W-12 (or J3-5). '!his

is

a

canplex

signal

w:tx>se

wCNe

Ehape

will

be

dcp:!ndent on

the

key

be.i.03

pressed. Figure

2-8

sh:Jws

a

typical

wCNe

form.

If

the

video data

signal

at

03-12

is

present

rut

the

data

is

rot

be:in;J

displayed on

the

screen, the nonitor

is

probably

at

fault.

Refer

to

the

TV

Mmitor

Ma1'IJal

(G'!C#

0501&-001) for a

detailed

theay

Of

cperation

am

other information regardin;J

operation

Of

the

rccni.tor cira.ti.ts.

----------------Page

2-3

----------------

SAi

ftai

r¢mancz

ftannal

Transmitted Data

(ID)

••••••

<--

•••••••••••••••••••••••••••••••••••

Received Data (RD)

•••••••••

~>

••••••••••••••••••••••••••.•••••

Request

To

Send

(R'IS)

••••••

<-

•••.••••••••..••••....•••.••.

Clear To Send

(CTS)

••••••••

->

.........................

.

Data

Set

Ready

(DSR)

•••••••

->

.......................

:

GRaJND.

•• •• •• •• ••• •• ••• ••• •• •• •• •• •• •• ••• •••• ••• ••

Carrier

Detect

(CD)

••••••••

->

................

.

• • • • •

MAIN

IDRr

rur

232C

(l)NNECI'OR

0130

0 0 0

09

07

06 05

04

03

02

01

0250240230 0

0200

0170

0 0

014

-:

-Receive Current

Loop

••••••

->

..

:

-·

.

-Transmit Current

Loop

•••••

<-

.....

:

+:

+Receive Current

LOOp

••••••

->

........

:

+:

.

Data Terminal

Ready

(D'IR)

••

<-

.•..••......••...

:

+Transmit Current

LOOp

•••••

<-

.•••.....•.......•.•...

:

Receive Data

(RD)

••••••••••

-->

•••••••••••••••••••••••••••••••••••

Tr

arisrni

t

Data.

(ID)

•••••••••

<-

................................

.

Request

To

Send

(R'IS)

••••••

-->

•••••••••••••••••••••••••••••

Clear

To

Send

(CTS)

••••••••

<-

......•.......•...........

Data

Set

Ready

(DSR)

•••••••

<-

.•...••••.•............

GROOND

••••••••••••••••••••••••

••••••••••••••••••••

Carrier

Detect

(CD)

••••••••

<-

•.•.•......••..•.

.

. .

.

PRINI'ER

IDRr

rur

23

2C

<X>NNECI'OR

0130

0 0 0

09

07

06 05 04

03

02

01

0250

0 0 0

0200190

0 0 0

014

Data Tenninal

Ready

(D'IR)

•••••••••

->

..........

:

Secondary Request

to

Send

(SRl'S)

••

->

.............

:

Figure

2-4.

ooe

Jnterfare

Qmrectnrs

2

Page

2-4

---------------

•SY

VERT

SYNC

RCVD

I

JI

13

I c E

I I

•3

J7

FRAME

6NO

+lSV

+lOV

-20V

KROW

111-7

KMUX

111-3

SVlO

M@fptepepge

M@puel

].---

5ms

~

KMUX

l'

J6-3

~

14-

.75ms

9ms

+18uS

4j

14--

.05ms

.Sms

ZS

CLK

U26-9

9ms

KMUX

2

J6-16

-+f

f4-

lms

11----KR_O_W_S

~

TP

6

VIDEO

DATA

U3-12

WAVEFORMS

ARE

FOR

REPEATED

UPPER

CASE

"H"

Figure

2-6,

1n>iral

wayefogs

SICTIOI

2

-.1

3

,I

1flft

IN

(I"

QflBl(L'Jilli

'lhe

~

of

Cl>erati.oos

is

divided

into

two

sections.

Tne

first

section

is

a

general

diso'3Sim

of

the

major furd:iora.l. elements

of

the

&WHJ.

Tne

seoom

section

is

detailed

circuit

description

of

terminal

operations.

Proc:bct

Sp!Cif

ications

infa:mation

fa:

the

ze

micrcprocessor

is

provided

in

~

A.

3,1

GIRR\t.

Flmctionally,

the

&Wl0

is

oomposed

of

four

major

elements.

They

are

the

keyboard

assemoly,

the

terminal

oontrol

board,

the

noni.tor assembly,

am

the

:pc7Ner

transfa:ners.

Figure

3-1

shows

the

basic

flow

of

terminal

signals

am

voltages between

these

canJ:X)nents.

3.1.1

Jee:rimrit

h keybcmd

is

a

~writer

style

irpJt

del7i~

used

~

the

operator

to

cxmnunicate

with

the

temintl,

the

a:u,

a:

any oorrected perii;tieral

<Evice.

'!he

000

uses

a scanning

type

keyb<md

which,

utilizing

commands

from

the

micrc.processor, sequentially

interrogates

each

key J:X>Sition

to

determine

if

a key

has

been

pressed.

If

a key

has

been

pressed,

the

keyboard

sends

out

the

a

signal

to

the

terminal.

ex>ntrol

board.

h

~

technique allows two keys

to

be

pressed

at

a

time

and

still

be

sensed

by

the

exmer.

'llli.s

is

called

"2-key

roll011er:".

'lhe keyb<md

al.ED

ex>ntains

the

s:p3Bker

for

the

keyclick

am

bell

tme.

3J.2

Terminal.

Cq¢ral

Board

h

temintl

ex>ntrol

tmrd

is

a sin31.e i:c beard

assembly

that

controls

all

display

and

CXlllnmicati.ons fl.nctions

of

the

tennintl.

It

oaltains a

Z8

micrqmc:essor

for

maraging

all

temintl

cperatiais,

video

~i.rg

cirali.ts

for

cxnverting

data

into

screen pcesentati.ors,

J'Dl-VOl.atile

meoocy

(WM)

fa:

storin:J

the

user

settable

operating

pu:ameters,

and

interface

circuits

for

controllin:J

temintl

a:munnica-

ti.as.

h

temintl

oontrol

tmrd

fiimWare

oorsists

of

12K

cytes

of

EPR.01

for

progran qJerations,

2K

cytes

of

RAM

for

display

manory,

am

1024

cytes

of

scratch

pid

RAM.

3J3

Malitor

AssettllY

h

nooita:

assembly

is

ma<E

up

of

three

pu:ts;

the

monitor

control

board,

the

f

lyback

transformer,

and

the

CRT

(cathode

ray

tube).

'!he noni.tor

ex>ntrol

board

receives

vertical

am

horizontal

sync

signals

and

video

output

signals

fran

the

termira.l. control board. 'lhe

starmrd

iooni.tor

is

a oonventiorel 12

i.n::h

P-31

green

phosphor

CR!'

using

a

raster

scan

non-

interlaced

(overlap)

refresh

technique.

(P-4

white

is

optionally

available.)

A

detailed

descrip;.ion

of

the

non:i.t<r assembly

qJerations

can

be

found

in

the

'IV Documentation Manual

(G'l'C#

05018-llH).

3J.4

Power

Transformers

Two

,EXJWer

transfa:mers

are

nnmted

on

the

i;:ower

i;anel

at

the

rear

of

the

terminal.

The

transfa:mers

deliver

st~wn

N:.

voltages

to

the

terminal

control

board

where

the

voltages

are

rectified

and rE:9Jlated.

Irpit

voltages

r~

from

100

volts

to

240

volts

can

be

aoo:mJOOd:tted

~

I'lf:Hls

aE

jl.lI11parin:J

on

the

primaries

of

the

transf~ners.

3,2

qmm.m

'l'flftJRY

Cl"

CH1RATJIRi

'lhe following secti.oo

is

a

detailed

di.SCl.lSSim

of

the

cperation

of

the

sbassemblies

mentiored

in

secti.m

3J.. 'lhese

slb-assanblies

are,

in

order

of

dis::ussion,

the

k~d.

the

temintl

control board,

the

rroni.tor control

board,

am

the

i;x>wer

transfa:mers. Termintl

ex>ntrol

lx>ard

schenati.c

set

720019 and keyboard schema

tic

72.e002

slnll.d be

referred

to

while

readi.rg

this

secti.m.

'Im

keybcmd

is

oonp:lSed

of

96

keys arranged

in

a matrix which

is

wner

micrcprocessor control

and

is

scanned

to

detect

key

depressions.

Figure

3-2

is

a

signal

flow

diagram

for

the

keybalrd

cirali.ts.

Schematic

720£102

slx>ws

the

keyboard

matrix

and

scanning

multiplexer.

Keyboard

scanning

is

initiated

by

the

micrcprocessor.

~ta

bits

DJ

through

rn

fran

the

microprocessor

are

applied

to

Flmction

----------------Page

3-1

----------------

001

!rainh\nuJre

Jlm@l

KEYBOARD

MAIN

PR

INTER

PORT

TERMINAL

CONTROL

BOARD

POWER

SUPPLY

MONITOR

CONTROL

BOARD

Figure

3-1.

SKI.I

Block

Diagram

MICRO-

PROCESSOR

KROW

KEYBOARD

MATRIX

FUNCTION

DECODER

U33

KMUX

KEYBOARD

DECODER

U48

sa::rmq

3

an•

•intnwme

.,,.,

Decoder

#1

(U33

sneet

4)

which

generates

keyboara

mul

tiplexin:J

terms

KMUXB

through

KMUX3.

'lbese

terms,

applied

to

the

column

scanniRJ

multiplexer

U48,

are

the

lexidecinal

EqUivalent

of

the

keybalrd column nmt>er

to

be

8Cal'lmd.

048, a 4

to

16 deooder,

selects

om

of

the

ootp.rt:s KaUJ

throogh

KCXLl.3,

drivinJ

it

lCM.

This

supplies

a

lCM

to

one

side

of

all

the

key

ocxrt:acts

in

the

selected

column.

When

a key

in

that

column

is

pressed.

the

appropriate

row

is

driven

low.

The

microprocesB>r

is

prep:ired

to

receive

irp1ts

f

ran

the

I<lOl

lines.

SinJe

the micrcprocesscx

knows

which colmm

is

beil'JJ

seamed

it

will

be

able

to

determine which key was

iressed

when

it

senses

one

of

the

RRCM

lines

going

low. The

KCOL

outputs

are

selected

in

a

sequential

roamer

ard

only

aie

Of

these

lines

is

low

at

ary

given time.

As

an

example,

ass.me

that

RMUXl

am

I<MtlX2

are

high and

the

other

two

irplts

are

low.

'Ibis

is

a hex

six

and

output

KCOL5

at

U48-6

will

be

driven low. 'Ibis low

is

presented

to

keys

B,

v,

c,

X,

z.

\,

RIN,

and

'·

If

the

z key

were

pressed,

KROW3

will

go low.

'Ibis

low-true

sigral

will

be

sent

to

the

mia:q>rocessor. 'lhe

micrqxocessor

will

~arm

a look-up

in

a

IOI

table

am

detemtim

that

a

RMUXl

am

I<MtlX2

plus

a

KROW3

is

equivalent

to

an

ASCII

character

lower case z.

3

.2.2

'Dgminal

Qntrol

flMrd

Figure

3-3

shows

the

terminal

control

board

divided

into

15

fulctioral

blocks.

'1hase blocks

are:

[l]

Adkess

Initialization

Ci.rant

[2]

Micrq>roeeSSOr

cirants

[3]

Progran

HD1

[4] Scrat:ch

pid

RN'1

[5]

Displ.C:W

IM

[6] Video timer arii

controller

(V'OC)

[7]

&ystan

Clock

[8]

RQl

tuffer

[9] Video generator

[le]

F\nction

18x>der

i2

[11]

F\n::tim

~

il

[12]

Nm-Voilatile

~

(WM)

[13]

Interface

Ci.rants

[14]

Bell

alp

[15]

~er

sui::ply

'lhe

~d

and

the

nooitor

are

mt

pirt

of

the

termiral

<Dltrol

txmd,

l:::ut

are

EhJwn

on

the

drawiR;J

for

data

flow

information

only.

'llle sigrel.s

slam

m Fig.ire 3-3

are

the major

signals.

Additional

information

may

be

el!ChcnJed

between blocks.

[l]

AmFBS

mr.I'IALlZATIDN

CIRClJlT (Sh 3)

'llle

Z8681

used

in

the

009

rspires

a

starting

aQka;s

of

ooe

instead

of

ee.

'lherefa:e,

the

reset

pulse

must

be

applied

to

Ul2

for

six

clock

pulses

to

allow

the

microprocessor

to

step

to

the

:Er<tl&

ac:Hress. 'lhe

del.cw

cirant

consists

of

Qle,

U40,

U48

and

associated

am~.

When

i;:ower

is

first

applied 040-6

will

be

held

low

for

a

peri<Xi

of

time

determined

qr

C55

and

ree.

'Ibis low

will

cause

a

hi

at

U48-2

am

a

carrespn:liRJ

low

at

048-6

am

048-4.

'1he

low

at

U48-6

is

applied

to

l.D.2-6.

'lhe low

at

U48-4

allows

Cli3

to

charge, keEping

Q1RJ

turrEd

off.

When

C55/R50

times

cut,

040-6

will

cp

hi,

U48-2

will

go

low,

am

048-6

will

go

hi,

removing the

ground from 012-6. U48-4

will

also

go low

allowing

Cli3

to

dis::harge

am

turning

Q1RJ

m.

012-6

will

go

hi.

Zener

diode

~

provides

voltage

protection

for

l.D.2.

[2]

~

(Sh3)

'1he

heart

of

the

009

is

the

Z8

micrcproca;sor.

It

controls

all

of

the

inpit

and

output

operations

of

the

terminal.

Under program

oontrol,

the

microprocessor

will

fetch

data,

execute instructions,

and

resp:n:I

to

the

naed3

of

varicus

temiral

cirants.

'Ire

Z8

fulfills

the need

for

higtrspeed

data

haOOling

~

having

32

p:>rts

dedicated

to

i.rplt/a.rt:p.It q?erations.

'1he

32

J/0

pins

are

arriDJeC]

into

foor

ports

of

8

lines

each.

Umer

program

control,

these

ports

provide

address,

timing,

and

status

signals.

'1he

&Wle

uses

Port

e

as

the

high

order

memory

address

output.

Port

1

is

a

combination

data

I/O

and

low

order

memory

address

output

port.

Port

2

is

used

~

two

differmt

cirants.

It

serves

as

a

data

inp.It:

port

for

the keybcmd

am

is

the J/0

port

used

~

the

NVM.

Port

3

has

four

inpit

and

four

outplt

lines.

'llle

irpJt

ports

ro-e

thru

P3-3

are

used

for

communication

input

and

for

signalil'JJ the

start

of

a video

data

transfer.

'lhe Clltplt: p:>rts, P3-4

thru

P3-7,

are

used

for

----------------Page

3-3

----------------

l

x

-----------------------------------------------------

POWER

REGULATORS

i+l2

i-12

i-20

6.2MHz

12.4MHz

~

CLOCK

~

ADD

RSTl*

~

!NIT

r---

AO

-

A7

S.P.

RAM

AO

-

AlO

DO

-

07

.....

PROM

~

DAO

-

DA9

DO

-

07

DAO

-

DA9

~

DSPLY

~

RAM

.......

M

.....

K

BELL

ODO

-

009

v

HSYNC

0

E

BELL BELL

z

ODO

-

007

T

.......

N

ODO

-

007

y

AMP

8

~

A I

.......

B c T

0 c

ROW

LBC,

LBRW-

VSYNC

0

A

KROWO

-

KROW7

p

BUF

1R R

R u

D

Cl

-

C3

~

LCO

-

LC3

VIDEO

-

NVM

-

GEN

LCGA

,.....

D/A

ATTR

1S

AMPL

KMUX

0-3

DO

-

07

DO

-

D7

FD

#1

~

FD

#2

TXD

1I

COMl

COM2

RCVD

VIDEO

DATA

BRK-

ACK

INTERFACE

CIRCUITS

l

--------

----------------------------------

-----------

...

Mlintznnme

.,...,

controlling

memory

I/O

operations,

<D'llllll1icatia'JS a.rt:pJt

qieratialS,

c:ni

oomrol-

ling

the

bell.

'Ile

micrq>rOCESEDr

uses

a 16

bit

acXJress bJs.

The

high

order

aciiress

bi

ts

determine

if

an

a.rt:pJt

qieration

will

take

place,

if

the

V'OC

will

be

selected,

if

a d1in:Je

in

video

ouq:ut

Einlld

CXXllI',

er

if

a

sp!Cific

J'DEIOOIY

JI:

will

be

selected.

The

lower

order

aciiress

bits

select

the

exact meoory la::ation.

The

low

order

aciiress

bits,

Nd

through

A7,

appear

at

Port

1

of

Ul2

and

the

high

order

aciiress

bits,

A8

through

AlS,

are

on

Port

e.

The

za

(Ul.2)

also

outputs

two

strobe

pllses.

'Ibey

are

the

.Mkess

St:Id>e

Not

(PS-)

at

9

am

the

tata

StrciJe

NOC

(I&)

at

B.

When

PS-

at

Ull-11

goes

high,

the

aciiress

bits

on

Port

1

are

latched

into

Ull

and

onto

the

aciiress

bus.

Since

the

high

order

bits

are

always

present

ther:e

is

no

need

to

latch

them

onto

the

actiress

bJs.

'Ile

microprocesmr Cira.ti.ts

oonsist

of

the

Z8,

Ul.2,

tri-state

blffer

U21,

latch

Ull,

plus

deooder

tn.3

arXl

its

associated

gates.

Ul3

is

a

dual

2-t~4

decoder.

The

top

half

selects

scratai

i;ad

~

or

display

~

'Ile

lower

sectim

selects

a sp:!Cific

mema:y

element

fer

the

miCJ:q>rocesa>r

to

werk

with.

ProgrClll

seJ.ectim

Not

(PMS-)

determines which

sectim

will

be

active.

If

the

microprocessor

wishes

to

access

the

scrat:dl i;ad

or

di.splay

RAM,

term

PMS-

will

be

low.

This

term,

along

with

Data

Strobe

Not

(00-),

p:ovides

an

ereble

at

1

of

tn.3.

If

All

arXl

Al2

are

low

the

scratcn

IB:l

~

will

be

selected

arXl

Sf«>--

at

4

will

go low.

If

All

is

high

arxl

Al.2

is

low,

the

display

FAM

will

be

selected

and

Display

Memory

Select

Not

term

IMr

will

be

low.

If

Al.2

is

high,

neither

aitplt

will

be

selected.

When

the

miaq>rocesa>r wiehes

to

acx:ess

the

i;mgram

mema:y, term

PMS-

will

be

high,

am

along

with

the

Data

Strobe

Not (D&-)

will

enable

the

lower

portion

of

Ul3.

Table

3-1

shows

the

procedure

used

in

selecting

a

specific

memory

element.

The

selected

PROM

will

be

rut:pit

Ellablea

at

28.

sp:r1111 3

I

INPUT

PIN I

OUTPUT

I 14 13 I 12

11

19 9

I I

I L L I L H H H

I L H I H L H H

I H L I H H L H

I H H I H H H L

I I

IPAhJ.c

3::1

PIDI

IRmt.I

Port 2

is

an

J/O

port

used

cy

the

kE¢oard

am

cy

the

no~volatile

memory

{NV'M)

circuitry.

Tri-state

buffer

U21

is

utilized

for

discrimimtinJ

betwee'l

info:mation

oomin;J

fran

the

k~d

am

infa:na.tim

going

to

the

NIM.

The

selection

is

determined

cy

signal

NV'M

ai:plied

to

the

anode

af

007.

When

this

sigrel

is

high,

microprocessor

information

will

be

sent

to

the

NJM

cira.ti.ts.

When

sigrel

NIM

is

low,

the

tri-st:ate

OOffer

is

Ellabl.Erl, allowiRJ

keybalrd

inf

a:na.tim

to

be

J;BSsed

thru

U2l

am

on

to

the

microprocessor.

[3]

PJroRAM

I«M

{Sh

3)

The program memory

consists

Of

12K

of

EPRCJII

CXl1t:ared

in

4

K's,

US,

te,

UIRJ,

am

U41.

'!he

ac:Xlress

la::ation

of

each

mcM

is

sbJwn on

the

schetl:atic.

When

the

micrc.processor wishes

to

access

the

program

memory,

all

frur

EPRCJII's

will

be Cllip Embled

(CE)

cy

the

write

term

WR-

which

is

low

dlriRJ

a

read

qieration.

lbwever,

only

one

PROM

will

be

Output

Enabled

{OE)

as

previ.CllSl.y

diS"ussed.

tn.

7

is

a

bi-directioral

tri-st:ate

is:>latcr

that

determines

if

the

program

memory

data

bJs or

the

display

meroocy

data

bis

is

OOl'llacted

to

the

mi.ere.processor

data

bus.

[4]

SCB\roI

mD

RAM

{fb

4)

'llle

scratdl

i;ad

RAM

is

a

sectim

of

memory

in

which

the

microprocessor

tenp>rarily

stores

the

information

it

needs

to

execute

the

control

progrmn.

It

cxn;ists

of

two

512

x 8

X::S,

tn.9

and

U28,

for

a

total

of

1824

cytes.

The

scratdl

pid

mM

is

selected

when

Scratdl

Manocy

Not

{SK>-), ai:plied

at

8,

is

low. A secxn:l

term,

Menoi:y

Write

NOC

{~),

m

19

will

determine

if

the

operatim

is

a

read

or

write

operation.

MWR-

is

a

combination

of

Data

------------------Page

3-S

---------------

GTC SW10 User manual

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