Heathkit H9 Manuale utente

n$ffiuAt

for the

VIDEO

TERMINAL

Model

oPERATION 595-2017-03

HEATH

COMPANY

. BENTONHARBOR,

MICHIGAN

HEATH

COMPANYPHONEDIRECTORY

Thefollowingtelephone

numbers

aredirect

lines

tothedepartmentslisted:

Kitordersanddeliveryinformation ......(616)982-3411

Credit. .. ... .(616)

982-3561

ReplacementParts

". .. (616)

982-3571

Technical

AssrstancePhoneNumbers

8:00A.M.to 12P.M.

and 1:00P.M.to 4:30P.M., EST,Weekdays

Only

RlC,Audio,

andElectronicOrgans ..... (616)

982-3310

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WeatherInstruments

and

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Security.

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Appliancesand

General

Products ."... (616)

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Computers ... (616)

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YOURHEATHKIT 90 DAY LIMITED WARRANTY

If you are not satisfied with our seroice - warranty or otherwise - or with our products, mite directly to our Director of Customer

Services,Heath Company, Benton Hubor, Michigan 49022. He will make certain your problems receive immediate, personal

attention.

Our attorney, who happens to be quite akitbuilder himself, insists that we desctibe our warranty using all the necessary legal €

phrases in order to comply with the new wananty regulations. Fine. Here they are: :iC)

For aperiod of ninety (90) days after purchase, Heath Company will replace or repair free of chage any parts that are defective F

eitheiinmaterialsoiworkminship.ioucanobtainpartsdirectlyfromHeathCompanybywritingusattheaddressbeloworby 3F

telephoning us at (6161 982-3571. And we'll pay shipping charges to get those parts to you - anywhere in the world. t?

We wurant that during the first ninety [90) days after purchase, our products, when correctly assembled,calibrated, adiusted 3=

and used in accordance with our printed instructions, will meet published specifications. ==

If a defective part or error in design has caused your Heathkit product to malfunction during the warranty period through no ?=

fault of yours, we will service it fiee upon proof of purchase and delivery at your expense to the Heath factory, any Heathkit *<=>

Electronic Center (units of Schlumberger Products Corporation), or any of our authorized overseas distributors. 5:

You will receive free consultation on any problem you might encounter in the assembly or use of your Heathkit product. ]ust !€=)

drop us a line or give us a call. Sorry, we cannot accept collect calls. =

Our wananty does not cover and we ile not responsible for damage caused by the use of corrosive solder, defective tools, *€

incorrect assembly, misuse, fire, or by unauthorized modifications to or uses of our products for purposes other than "t 3=

advertised. Our warranty does not include reimbursement for customer assembly or set-up time. ?=

This wananty covers only Heathkit products and is not extended to allied equipment or components used in conjunction with {--

ourproducts.Wearenotresponsib|eforincidentalorconsequentia|damages.Somestatesdonotallowtheexclusion

limiiation of incidental or consequential damages, so the abovi limitation or-exclusion may not apply to you. fhl, *'a".atiy =

gives you specific legal rights, and you may also have other rights which vary from state to state. 1i;

lF-

Prices

andspecificationssubject

to changewithout

notice

Heathkit@

Manual

forthe

VIDEO

TERMINAL

Model

oPERATION 595-2017-03

HEATH COMPANY

tsENTON HARBOR, MICHIGAN 49022

Copyrlght

@1977

HeathCompany

Ail RightsReserved

Printed in tho United Stat€8 of Amorica

Pase2 @

TABLE OF CONTENTS

INTRODUCTION.

OPERATION

Local Function Keys

Special

FunctionKeys.

ControlCharacters

HoIdScreen.. ..

SYSTEM

CONSIDERATIONS

HeathkitComputerSystemInterface

Standards

General

Interfacing

READIUSTMENT

Brightness

Focus

Centering

Height

width

RepeatRate .

Cleaning

SPECIFICATIONS

TROUBLESHOOTING

Troubleshooting

Charts.

.. ..

Troubleshooting

Waveforms.

ShippingInformation

CIRCUITDESCRIPTION

BasicOverview.. ....47

PowerSupply .......48

Video

Circuits ....... 48

CharacterGenerator .....,..50

KeyboardCircuitBoard ....54

RAMandCounter ... 55

Timing andProcessing

Unit (TPU) .. .... 57

Input/Output

(I/O) ... 66

SEMICONDUCTORIDENTIFICATION

ComponentNumberlndex ........68

PartNumberlndex ...71

ROM

andPLAPrograms

.. ....... 85

X-RAYViews ... (Illustration

Booklet,Page

74-23)

SCHEMATIC.... Fold-in

WARRANTY.... .. Insidefrontcover

CUSTOMER

SERVICE .... Insiderear

cover

INTRODUCTION

The Heathkit Model H9 Video Terminal candisplay

information coming from a digital computer or in-

formation typed in from the keyboard.This informa-

tion isdisplayedortaL2"

(diagonal)

cathode

raytube

(CRT)

that is capableof displaying 960charactersat

onetime (12rows with 80 characters

perrow).

A 67-keyASCIIkeyboard,

which permitsyoutocom-

pose

andedit directly ontheCRT,

has

acapabilityof

64 different characters and zq different functions.

This messageorprogram

canbetransmittedthrough

the standard

serial

I/O interface

(EIA,

TTL, or 20

current loop) to a digital computer or through the

parallelI/O interfaceto a paper

tapereader/punch.

The Video Terminal can be used with any digital

computerin adedicatedformat,in astand-aloneap-

plication, or in a time-sharing system.It lets you

communicate

with adigital computer

in higher-level

language (Basic,Assembler,etc,) rather than just

using toggle switches.

The Video Terminal is also

much faster(up to 9600 baud) than the standard

electro-mechanicalteletypewritersystems.You can

selectany data

ratebetween

110and g0OO

baud.

Otherimportant features

include:

. Automatic scrolling

. Cursorcontrols

. Eraseto end of line

o Erase

page

o Short form (four 12-line columns of zO

characters)

o Automatic line carryover

. Plotmode

o Built-in speaker

(audiblebell)

o Transmit page

These features,along with the attractively-styled

cabinet, make the Video Terminal a versatile

peripheral

for your computersystem.

Pase4 @

OPERATION

The Video Terminal will generate

and display 64

ASCII codedcharacters.

They include the alphabet

(uppercase

only),numbers,

punctuation,andmany

symbols.

Thirty-two standard

controlcharacters

and

twenty-four special

functionscanalso

begenerated.

Pictorial

1-1

(Illustration

Booklet,

page

shows

the

location

ofthekeys

described

in thefollowing parag-

raphs.

LOCAL FUNCTION KEYS

Thelocal

functionkeys

donottransmit

ASCII

charac-

ters;

they only affect

the display.

CURSOR CONTROL KEYS

These

keysareon the far right of the keyboard

and

they arelabeled

with arrows.

These

keysmove

the cursorone

character

position

or one character

line asindicated

by the arrow.

HOME

This keymoves

thecursor

to thefirst character

loca-

tion on the first line.

ERASE EOL (End Of Line)

Thiskey erases

thetextfrom the currentcursor

loca-

tion to the end of that line.

ERASE PAGE

Thiskeyerases

alltext

and

fills thepage(screen)

with

spaces.It also

places

thecursor

in thehome

position.

cuRSoR(f)

DO\

lrri

CURSOR

(+) I

RIGHT CURSOR

(---,)

LEFT CURSOR

(<-)

Page5

AUTOCARRY

Whenthis keyispushed

in, thecursor

automatically

goes

tothe

beginningof

thenext

lineafter

full line of

textistyped.

At theendofthebottomline oftext,the

cursorwill startoveratthebeginningofthefirstline

fhome position),

providing the Terminal is not in

scrollmode (SCROLL

key released).Also, referto

"Hold Screen"

onPage8.

SHORT FORM

When this key is pushed in, the display format is

changedfrom twelve lines of 80 characters

fkey re-

leased)to four columns

- eachcolumnconsistingof

twelve lines of 20characters.Short

form isusefulfor

writing programs

in machinelanguage

where

entries

areshort.

SCROtt

Whenthiskeyispushed

in, andafterthefirst twelve

linesoftextaretyped,thefirstline iserased

(scrolled

upwardJ and lost. Each remaining character line

movesup one

line position

andthecursormovesto

thebottomline.In short

form,the left column of 24o

characters

[12 lines of 20 characters)

is erased

and

lost.The remaining three columns move to the left

onecolumn position,

and the cursormovesto the

right column.

When

theSCROLLkeyis released

(in

the non-scroll

position),

and afterthe first twelve

lines of text are typed, the cursorreturns to and

flashesat the start

of pageposition.Furthertyped

entrieswill write over the existing text on the first

line.Also,refer

to "Hold Screen"

onPage

SPECIAL

FUNCTIONKEYS

RETURN (Carriage Return)

Thiskeymovesthecursor

tothefirstcharacter

posi-

tion of the line it is currently in and it transmitsthe

ReturnASCIIcode

(control

M).Return

canbewritten

into aRAM locationonly if thatlocation

contains

space.Thatis,acarriage

returnwill notwrite overany

other character.

Returnis a non-displayablecharac-

ter,except

in theplot mode.

LINE FEED

This key moves the cursor down one line and it

transmitsthe line feedASCII code(control )). Line

feeddoesnot write into RAM andit is not a display-

ablecharacter,except

in the plot mode.

RUB OUT

Thiskeytransmits

anASCIIruboutcode

(delete).

Rub

out does not write into RAM and it is a non-

displayable

character,

exceptin the plot mode.

ESC(Escape)

This

key

transmits

anASCII

escape

code.

Escapedoes

not

writeintoRAMand

itis

anon-displayablecharac-

ter,exceptin theplot mode.

REPT (Repeat)

When this key is held in, along with another key, it

will repeatthefunction oftheotherkeyata

preset

rate

aslong asboth keys are held down. The presettable

repeatrates

are 3.7-,7.5-,L5-, or 30-characters

per

second.If the baud ratethat hasbeen selected

is less

thanthe

repeatrate,

therepeatfunction will operate

the slower rate.

PLOT

Whenthiskeyispushed

in,thetextisblankedexcept

forthe

firstline of

thepage.

Thisfirstline,however,is

displayed on each of the four bottom lines of the

screen.Thescreenareaabovethebottomfour linesis

dividedinto128scan

lines.

See

Pictorialr-2.A dash,

one character

wide, will appearaboveeachof the

charactersdisplayed

in the bottomfour lines.The

position

ofthedashabove

thebottomline (line

0)is

proportional

to the binaryvalue of the z-bit ASCII

code

for that character.For example,aCTRL/SHIFT

orASCII

null, isall zeros,

itsbinaryvalue

iszero,

and it appears

at the bottomof the 128line space

directly abovethe ASCIInull. Pictorial r-g fllustra-

tion Booklet,Page2)gives

theline numberandthe

ASCII

codefor eachkeyentry.

A RUB

OUT (delete)

all ASCIIL's

hasa binaryvalue

of 727,

sothe dash

appearsatthetop line (line128)in thespaceabove

therub out character.

In theplot mode,

all charactersare

written intoRAM,

but their special cursor movements are not im-

plemented.That is, a RETURN(carriage

return) is

written into RAM,butthecursordoesnotmove.Any

control characterthat appears

in the text will flash.

Even though the lower-casealphabetic

characters

cannotbegeneratedfrom thekeyboard,

theycanbe

LINE

INARY

VALUEI27)

LIN

INARY

VALUEO)

entered into RAM from the digital computer, Like all

other characters, the binary value of the lower case

charactersis stored in RAM and the dash is d.isplayed

on the appropriate line in the 128-line space. Lower

case characters stored in RAM are displayed as the

characters represented by the ASCII words 010 0000

through o17 71,'17.

BAUD RATE

Whenthis key is released

(out),

the Terminal will

operateat 110baud.Whenthiskeyispushed

in, the

rate is set by the BAUD RATE switch on the rear

panel.

Therear

panel

switchselectseither

300baud

orthe

preset

baud.

Thepreset

baud

isdetermined

bya

jumper

wire ontheI/O circuit board.

OFF LINE

When

this

key

pushed

in,the

Terminalisinhibited

from transmitting or receiving data from the serial

I/O,

but it doesnot interrupt

transmission

or recep-

tion through

the

parallel

I/Oport.

Thislets

you punch

read

tape

the

paper

tapereader/punch

whilethe

Terminal

is offline from the digital computer.

NON-

',iil,

r^rc

3iililfijfi

PICTORIAL \-2

Page 7

BREAK

Whenthis keyispushed

in, it generates

acontinuous

space

at the serialoutput, It is generally

used

to tell

the

computer

that

youwishtointerruptexecution.

not confuse

this spacewith an ASCIIspace.It is de-

fined as

zero

currentin a20mA current

loop,anEIA

positive

voltage,

oraTTL logic 0.TheBREAK

keycan

bepressed

anytime you want to terminate

thetrans-

mit page

function.

FULL DUPLEX

Whenthis keyisreleased

(out),

theTerminaloperates

in the half duplex mode. That is, data from the

keyboard or parallel input is written directly into

RAM and,at

thesametime,ASCIIcharactersare

sent

out the serialand parallel outputs.When the FULL

DUPLEX

key is pushedin, the Terminal operatesin

thefull duplex mode.Data

from theparallelinput or

fromthekeyboard

issenttothecomputerand

echoed

backtotheTerminalbeforeit iswritten into RAM and

displayedon the screen.

XMIT PAGE (Transmit Page)

Whenyou momentarily press

this key,data

is trans-

mitted from the RAM (screen),

startingfrom the cur-

rentcursorlocationandproceeding

to theendofthe

page.When it has completed the page,

the cursor

returns

homeandthetransmitpage

modestops.The

dataistransmitted

simultaneously

outboth theparal-

lel andserialports

atarate

determined

by theslower

ofthe

two ports.

Press

theBREAK

keytointerrupt the

transmit page

function.

CTRL (Control)

When

thiskeyisused

in conjunction

with some

the

otherkeys,

it changes

those

keys

to special

function

keys.

Forinstance,

CTRLM is equivalent

to areturn

(carriage

return).The control key combinationsare

shown

in Pictorial

1-3.

SHIFT

When this key is usedin conjunction with another

key,

thecharacter

printedontheupperportion ofthat

key will bedisplayed.

Since

theTerminaldoes

not

generate

lower-case

alphabeticcharacters,

it is not

necessary

topush

theshiftkey

togenerate

upper-case

alphabeticcharacters

- they are shifted automati-

cally in the keyboard

encoder.

CTRL/SHIFT

These

two keysareused in conjunction with other

keys

toprovideadditional specialfunction keys.For

instance,CTRL/SHIFTP (which means, press the

CTRL,

the SHIFT,and the P keysat the sametime)

putsanASCII

null fall zeros)

on thebus.

t"n"t @

CONTROTCHARACTERS

The Terminal generates

all 32ASCIIcontrolcharac-

tersfrom thekeyboard.

Normally these

charactersdo

not write into RAM, nor arethey displayed on the

screen.Exceptionsareoutlined in the description of

the plot mode.TheTerminal recognizes

only four of

thecontrolcharacters.It will recognize

thesefromthe

keyboardor from the parallel or serial input ports.

The four characters

are:

Line Feed

(LF or CTRL

]) - This characterdu-

plicates

the LINE FEEDkey.

CarriageReturn(CR

or CTRLM) - This charac-

ter duplicates

the RETURN

key.

Back Space

(BSor CTRLH) - This character

movesthe cursorto the left onecharacter

posi-

tion without disturbingthe characterbeingdis-

played.

Bell(Bel

CTRL

- Thischaractercausesthe

Terminalto soundashortaudibletonethrough

aninternalspeaker.Pictorial 1-3

showsthecon-

trol andnormalcharactersthattheTerminal can

generate.

HOLD SCREEN

If the screenhasbeenfilled, and a scroll function

should occur,but can't becausethe SCROLLkey is

notpushed

in,theTerminalgoes

intothehold screen

mode.Thecursor

returnstothe startofpage

location

andblinks.All external

inputsare

disabledwhenthis

occurs.Datacanonly be

transmitted outoftheTermi-

nal by the keyboard.The Terminal stays

in the hold

screenmode until the SCROLL

key is pushedin or

until the ERASE

PAGEkey is pressed.

Youcanusethisfeature

in conjunction

with thepaper

tapereader/punch

for reviewing programtapes.

The

reader/punch

canread

thetape

atitsmaximum speed

tofill upthescreen

quickly,thenafterthelastline has

been written, the hold screen mode disables the

handshake

signal coming from the Terminal. This

stops

thetape

fromrunning. You can

thenreviewthe

contents

of the screen.

When you arefinished, just

press the ERASEPAGE key and receive another

screenfull of programinformation automatically.

Indice

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