Heathkit H9 User Manual

n$ffiuAt

for the

VIDEO

Model

oPERATION

TERMINAL

H9

595-2017-03

,l

I

HEATH

COMPANY

.

BENTON HARBOR,

MICHIGAN

HEATH

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Heathkit@

for the

Manual

VIDEO

Model

oPERATION

TERMINAL

H9

595-2017-03

HEATH COMPANY

tsENTON

HARBOR,

MICHIGAN 49022

Copyrlght

Ail Rights Reserved

Printed in tho United

1977

@

Heath Company

Stat€8 of

Amorica

Pase2

@

INTRODUCTION.

OPERATION
Local Function Keys
Special
Control Characters

HoId Screen .. . .

SYSTEM

READIUSTMENT
Brightness
Focus
Centering
Height
width
Repeat Rate
Cleaning

Function Keys.

CONSIDERATIONS
Heathkit
Standards
General

Computer System Interface

Interfacing

.

TABLE

OF CONTENTS

CIRCUIT DESCRIPTION

BasicOverview.. ....47

PowerSupply .......48

4

5
8
B

10
L2

26
26
26
27
28
30
30

Video
CharacterGenerator
KeyboardCircuitBoard
RAM
Timing and Processing
Input/Output

SEMICONDUCTOR IDENTIFICATION

ComponentNumberlndex
PartNumberlndex
ROM

X-RAY Views ...

Circuits

and Counter ...

(I/O)

and PLA Programs

(TPU)

Unit

..

(Illustration

.......

.....,..50

....54

.. . . .. 57

........68

....... 85

Booklet, Page

48

55

... 66

...71

74-23)

SPECIFICATIONS
TROUBLESHOOTING

Troubleshooting
Troubleshooting
Shipping Information

Charts.
Waveforms .

.. . .

32
33

35
43
46

SCHEMATIC....

WARRANTY....

CUSTOMER

SERVICE

Fold-in

.. Insidefrontcover

.... Insiderear

cover

INTRODUCTION

The Heathkit Model
information coming from a digital computer
formation typed in from the

is

tion
(CRT)

one time

displayed orta

that is capable of displaying 960 characters at

(12

rows with 80

A 67-key ASCII keyboard,
pose

and

edit directly on

64

different characters and
This message or
the standard
current
parallel

The Video Terminal
computer
plication,
communicate
language
using toggle switches.

serial
loop)
I/O interface to a

in

a dedicated format, in a stand-alone ap-

or in a time-sharing system. It lets

(Basic,

H9 Video Terminal

(diagonal)

L2"

which

the

program

to a digital

with

Assembler,

can be transmitted through

I/O interface

paper

can be used with any digital

a digital computer

The Video Terminal

can display

keyboard. This informa-

cathode

characters

permits you

has

CRT,

zq

different functions.

(EIA,

computer or through the

tape reader/punch.

rather

etc,)

ray

per

row).

a capability of

TTL,

or

in higher-level

than

in-

or

tube

to com-

20

mA

you
just

is

also

much
electro-mechanical teletypewriter systems. You
select any data

Other important features

These features,
cabinet,
peripheral

faster

.
.
.
o
o

o
.
o
o

(up

to

9600

rate between

Automatic
Cursor controls
Erase to
Erase
Short form
characters)
Automatic
Plot mode
Built-in
Transmit page

make

for

scrolling

end of

page

(four

line carryover

speaker

along with

the Video Terminal

your

computer

baud) than

110 and

include:

line

12-line

(audible

the

system.

the standard

g0OO

baud.

columns of

bell)

attractively-styled

a versatile

can

zO

Pase4

OPERATION

The
ASCII
(upper

symbols.
twenty-four
Pictorial
location

raphs.

Video

coded

case

Thirty-two

1-1

of the

Terminal

characters.

only),
special

(Illustration

keys

will

numbers,

standard

functions

described

generate

They

include

punctuation,

control
can also

Booklet,

in

the following

and

the

characters

be

page

1)

display

and

generated.

shows

64

alphabet

many

and

the

parag-

@

The

local

ters;

they

CURSOR

These
they

keys

are labeled

uP

cuRSoR (f)

lrri

DO\

RIGHT
LEFT

CURSOR

function

only

CONTROL

are

CURSOR

CURSOR

keys

affect

on

the far

with

(+)

(---,)

(<-)

the

arrows.

do not

display.

KEYS

right

I

|

LOCAL

transmit

of the

These
the

cursor
character
or one
line

as indicated

by

the

ASCII

charac-

keyboard

keys

move

one

position

character

arrow.

FUNCTION

HOME
This

key moves

tion

on the

and

ERASE

This

key

tion to
ERASE
This

spaces. It

the

key

EOL

PAGE
erases

KEYS

first

(End

erases

end

all text

places

also

the

cursor

line.

Of Line)

the

text

of that

the

from

line.

and

cursor

to

fills

the

first

the

current

page (screen)

the

in

the home

character

cursor

position.

loca-

loca-

with

@

-

Page5

AUTO CARRY

pushed

this key

When

goes

to the

is typed.

text

cursor will

fhome

scroll mode
"Hold

SHORT FORM
When this key is

changed from twelve lines
leased) to four
twelve lines of 20
writing
are

position),

Screen"

programs

short.

is

beginning of

At the end of

start over at the beginning of the first line

providing

(SCROLL

on

columns - each column

characters. Short

in

in, the cursor

the next

key released). Also, refer to

Page 8.

pushed in,

machine language

automatically

full

line

the bottom

the Terminal is not in

the display format is

of 80 characters

a

after

line of

consisting of

form is

where

text, the

fkey

useful for

entries

SPECIAL

SCROtt

When this key

line of

re-

lines

of text
upwardJ and
moves up

bottom line. In

the
characters
lost. The remaining three columns move to the
one column
right

column.
the non-scroll
lines

of
flashes at the start
entries will write over the existing text on the
line. Also, refer

FUNCTION

pushed

is

are typed, the first line is

lost. Each remaining
line

one

lines

[12

position,

When

position),

text are typed, the cursor

to

in, and after the first twelve

position

short

of

the SCROLL key

of

"Hold Screen"

and the cursor moves to

form,

20

characters)

and the cursor moves to the

and after the

page position. Further

the

left

on

KEYS

erased

returns

(scrolled

character
column of

is

erased

is released

first

twelve

to and

Page

8,

line

24o

and

left

(in

typed

first

RETURN

This

tion
Return ASCII code
into a RAM
space. That is, a carriage
other
ter,

except

LINE FEED

This key moves
transmits
feed does not write
able

RUB OUT

This key transmits
out
displayable

(Carriage

key moves the cursor

the line it is

of

location only

character.

in

the

the line

character, except

does not

character,

Return)

currently

(control

Return is

plot

mode.

the cursor down

feed ASCII code

into RAM and

in the

an ASCII rub out code

write into RAM and

to the first character

in and it transmits the

Return

M).

if

that

return

will not write over any

a non-displayable charac-

plot

except in the

can be written

location

it is not a display-

mode.

contains

line

one
(control

(delete).

is

it

plot

mode.

posi-

and

Line

)).

Rub

a non-

(Escape)

ESC
This

key

transmits

not

write intoRAM

ter,

except in

a

REPT

When this

it

will repeat the function
as long as both keys are held down. The
repeat rates
second. If the baud rate that has been selected
than the
the slower rate.

(Repeat)

key is held in, along with another key,

repeat rate,

the

are

an ASCII

and

plot

3.7-,

the

escape

it is

a non-displayablecharac-

mode.

the

of

7.5-,

L5-, or

repeat function will

other

code.

Escape does

key at a

30-characters

preset

presettable

is less

operate

it

rate

per

at

PLOT

pushed

When this
for

the

key is

first line

displayed on

the

of

each of the four bottom

the text is blanked except

in,

page.

This first line, however, is

lines

of the
screen. The screen area above the bottom four lines is
divided into 128 scan
one character

wide,
characters displayed
position
proportional

code

P,

or
and
directly
tion
ASCII
all ASCII L's

of the dash above

to the binary value of the

for

that character. For

ASCII

null, is all zeros,

it

appears

above the

Booklet, Page 2) gives

code for each key

has a binary value
appears at the top line
the rub

In

out character.

plot

the

mode,

lines.

will appear above each of the

in the bottom four lines. The

the bottom

at

ASCII

entry.

(line

all characters are

but their special cursor

plemented.
written
control

into
character that appears

Even though
cannot be

generated from the keyboard,

is, a RETURN

That

but the cursor does not move. Any

RAM,

lower-case alphabetic

the

Pictorial r-2. A

See

the bottom line

(line

z-bit ASCII

example, a CTRL/SHIFT

its binary value

so

is

of the 128 line

null. Pictorial r-g

line

the

number and the

A RUB

of

OUT

727,

128) in the

written

movements

(carriage

fllustra-

(delete)

so the dash

space above

into

not im-

are

return) is

in the text will flash.

characters

they can be

dash,

0) is

zero,

space

or

RAM,

entered into RAM
other

characters,
characters
on the appropriate
case
characters
through

BAUD

is

characters

represented

o17 71,'17.

RATE

When this key is
operate at

110 baud. When this key is

from

the digital

the binary value

stored in RAM

line

in

stored in

by

released

computer, Like

of the lower

and

the dash is

the 128-line

RAM

are

displayed

the ASCII

(out),

the

space. Lower

words

Terminal will

pushed

rate is set by the BAUD RATE switch on

panel.

preset

or the

jumper

The rear

wire on

panel

switch selects either

preset

The

baud.

the I/O circuit board.

baud

is

determined

OFF LINE
When

this
from transmitting
I/O,

but it

tion through

read

or

Terminal

tape

is

pushed

key

is

in,

the

or receiving data from

does not interrupt

parallel

the

the

on

line from

off

paper

port.

I/O

tape reader/punch

the digital computer.

Terminal is inhibited

transmission

This lets

you punch

all

case

d.isplayed

as the

010 0000

in, the

the rear

300 baud

by a

the serial

recep-

or

the

while

L I NE

(B

INARY

VALUE I27)

(B
VALUE O)

LIN

INARY

NON-

r^rc

',iil,

3iililfijfi

PICTORIAL \-2

@

%

Page 7

BREAK
When this

space
the

computer

not

confuse
fined
positive

pressed

be

page

mit

FULL
When this key is

in

the half

keyboard

RAM

out the
DUPLEX
the full
from
back to
displayed

XMIT

key is

at the

serial

that

this

as

zero

current in

voltage,

any time

function.

DUPLEX

duplex mode.

parallel

or

and, at

the keyboard

the same time,

serial and

key is

duplex

the Terminal

on the

PAGE

(Transmit

pushed

you

space with

or a TTL logic

released

pushed

mode. Data

screen.

in,

output,

wish

a 20 mA

you

want

(out),

input

parallel

in,

is

sent to the

before it

It is

Page)

generates

it

generally

to interrupt

an ASCII

0. The BREAK

to terminate

the Terminal

That is,

is written

ASCII

outputs.

the Terminal

from

computer and

is written into

space. It

current

data from

characters are

When the FULL
parallel

the

a

continuous

used

to tell

execution.

is de-

loop,

an

EIA

key

can

the trans-

operates

directly into

sent

operates in

input

echoed

RAM

and

Do

the

or

data is
lel
of the

transmit page

CTRL
When

other keys,
keys.
(carriage
shown

SHIFT
When

key,
key will
generate
necessary
alphabetic
cally

CTRL/SHIFT

transmitted

and serial ports

ports.

two

(Control)

this key is

it

For instance,

return).

in Pictorial

this

key is

the

character

be

displayed.

lower-case

push

to

characters

in the

keyboard

simultaneously

at a rate

Press

the BREAK

function.

used

in

changes

those

CTRL M is

The

control key

1-3.

used in

printed

Since

alphabetic

the

shift key

-

encoder.

outboth

determined

key to

conjunction

keys

to special

equivalent

combinations

conjunction

on the upper

the Terminal

characters,

generate

to

they

are shifted

the

by

the

interrupt

with

some

function

to

a return

with another

portion

does

it is

upper-case

automati-

paral-

slower

the

of

the

are

ofthat

not
not

you

When
mitted from
rent

cursor location

page.

When

returns

home

momentarily press

the RAM

it has

and the transmit page

(screen),

proceeding

and
completed

this key,

starting from

the

data

to the

page,

mode

is

trans-

the cur-

end of the

the

cursor

stops. The

These

two keys
keys
instance,
CTRL,

puts

provide

to

the

an ASCII

are

used in

additional

CTRL/SHIFT

SHIFT,

null

and

fall

conjunction

special function

(which

P

the P

zeros)

means, press

keys at

on the bus.

with

the

same time)

other

keys. For

the

t"n"t

@

The Terminal
ters from the keyboard.
not write into RAM,
screen. Exceptions

plot

the
the control
keyboard
The

four characters

Line Feed
plicates

Carriage Return
ter duplicates

generates

nor are they

are

mode. The

characters. It will recognize

or from the

Terminal recognizes

are:

(LF

or CTRL

the LINE FEED key.

(CR

the RETURN

CONTROT

all 32 ASCII

Normally these

outlined in the description

parallel

])

or CTRL M) - This

control

characters do

displayed

only

these from

or serial input

-

This

character du-

key.

charac-

on
four

ports.

charac-

HOLD

CHARACTERS

Back

Space

moves the cursor to the left

the

of
of

the

tion without disturbing the
played.

(Bel

Bell
Terminal to
an internal speaker. Pictorial 1-3
trol and normal characters thattheTerminal
generate.

SCREEN

(BS

or CTRL H) - This

one character

character being dis-

or

G) - This

CTRL

sound a short audible tone

character causes the

character

posi-

through

shows the con-

can

If the screen has been
should occur,

pushed

not
mode. The
and blinks. All external
occurs. Data can only be
nal by the keyboard. The Terminal stays
screen mode until the SCROLL
until the ERASE

but can't

in, the Terminal

cursor

filled,

returns to the start of

inputs are

PAGE key is

and a scroll

because the SCROLL key

goes

into the hold

disabled when this

transmitted

out of

key is

pressed.

page

pushed

function

screen

location

the Termi-

in

the hold

in

You

can use this feature

is

tape reader/punch
reader/punch
to fill

up the
been written,
handshake
stops

the tape

or

contents
press
screen full

the

can read

screen

the

signal

from running.

of the

screen.

ERASE

program

of

in

conjunction

for reviewing program

the tape

quickly,

hold

coming

When

PAGE

information

at its maximum

then

screen mode

from

You

you

key

and receive

with the

after the last line

disables
the Terminal.
can

then

are finished,

automatically.

paper

tapes.

speed

review

another

The

has

the

This

the

just

SYSTEM

CONSIDERATIONS

Video

digital

section

Terminal

Refer

System.

computer

"General

the

interface

following

The
Interface Standards"
Heathkit H9
tal

Computer.

Heathkit Computer

Heathkit
minal,
select

refer to

the suitable

"Heathkit

explains

to this

with

Computer

how to

Heathkit

the

to

you

you

your

if

are

H9

section

If

Interfacing"

scheme'

System

interface

HB Digi-

have the

a non-

using

Video

section

the

Ter-

and

Paselo

@

HEATHKIT

The

following
signated
Standard.

H9 Video
Both
must be
format:

as the

Use these

Terminal

the Video

wired

Data
Signal Level
Word
Parity

COMPUTER

interface

Heathkit

standards

with

Terminal

to operate

Rate

Length

configuration
Computer

the
and

in the following

System Interface

you

when

H8 Digital

the Digital

600 Baud
EIA
8 Bits
None

600 BAUD

SYSTEM

has

been

interface

Computer.

Computer

standard

RS-232C

or

de-

the

INTERFACE

To

do this:

1.. Examine
Video Terminal
shown in Pictorial 2-1.

2.

Examine
HB Digital

as shown in Pictorial 2-2.

3.

Examine the interconnecting
tween the H9
wired

as shown in Pictorial 2-3

Booklet, Page 3).

READER
CONTROL
DISABLE

STANDARDS

I/O

the

the Serial I/O

Computer to make

circuit board in

to make sure it

circuit board in the

and the HB) to make

il{stT

--

-f',ffi;

-

sure

-\J

--nA

the H9

is

wired

it is

wired

cable

sure

(Illustration

27 0a

/

t

as

(be­it

is

r/o

I

"j't.*-H

-6

P60l

P601-7

-8

P60l

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P60l

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P60l
P60l-lt
P60t-12

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PICTORIAL

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o

o
o

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o
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o

o
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o

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NOTE:

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the

preset

select appears

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lug 3 to lug 2. Be

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The number of bits
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WORD LENGTH N2

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6

7
8

N2)

word is determined by

37

programmed

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and

for

(pin

38)

5-,

N1

0

o

1.
1

6-,

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0
1,
0

1

the N1

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or

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The UART

erate a

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parity

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received

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follow the last data

generate a parity

the UART

The Terminal
Pictorial 2-16

to

was

(Illustration

can

the

The stop bit

bit. A logic 0 on

initially wired for no

programmed

be

output or to eliminate

the P input

parity

bit from the transmitted

(s)

will immediately

the P input causes

bit.

Booklet, Page

curs when a wire is connected between

your

bit,

parity

bit is

own special applica-

connect

a wire between

on the I/O circuit board. The
the H9 system. However, if

requires the

tion
holesPand

parity

*.

to either

(pin

parity.

5).

gen-

35) to the

See

This oc-

holes P and +

not used

with

Pase22

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This input

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that
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A logic o on
immediately after

inserts even

the

Since

is not connected.

input

requires a

odd or

select

KEYBOARD

jumper

A
keyboard circuit
repeat

This is the

ond.

screen when

the
key are
"Repeat
section of
repeat rate.

PARITY

(E)

to

checked

by the

parity

if

E input

the

parity immediately

Terminal does

parity bit,

even

PROGRAMMING

wire connection

rates; 3.7-,

rate at which characters

held down at the same time.

Rate"

this Manual

(E)

the UART

was selected

the data

parity,

board

7.5-,

the REPT

instructions in the

selects

receiver and

as explained

(pin

36) will insert odd
A logic

bits.

after the data

not use the

your

If

Pictorial

lets

\5-, or

(repeat)

if

special

2-77

on the bottom

you

30-characters

you

want to change

select one of

key and a character

the type

generated

1

parity

shows

are written on

"Readjustment"

parity

of

by the
above.

parity

input

this

on

bit, the

application

how to

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Refer to the

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o

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TYPICAL

Parallel

following

The

the signal

panel.

rear

the

PIN

#

7

2

3

4

5
6
7
8

I

TERMINAL/COMPUTER

Input/Output

Connections

parallel I/O connector

ofthe

parallel

Parallel

Output

Take Data o

pin

each

on

DATA DESCRIPTION

Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6

T

BiI
Bit 8

DAVo

SYSTEMS

describes

chart

I/O connector

o
o

o
o

r
.

.

on

Positive true logic.
High

Level Output Voltage

(High

pA
LowLevel

(Low

Level

Output Current).

OutputVoltage

Level

Output Current).

Standard 74L5175

Available

data

Data

will hold

available

at

Output
Terminal
is
device.
HighLevel

(High

p.A

Low
(Low

Refer to the

OutputVoltage[Vr")

Level Output

Level Output

Level Output

"Handshake

PICTORIAL

latches.

- Normally

this line

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the

CurrentJ.

Voltage

Current).

(Vo")

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low to

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Timing"

2.I7

:

2.7 min.

0.4 Vmax.

The

high.

indicate

that there

for the external

2.7Y min.
V max.

0.4
section.

@

@

Video

@
@

-400

amA

-400

a mA

10

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Pagezs

PIN

#

17
72
13
74
15
16
77
18

19 mAv; Data Taken

20 DAV;

DATA DESCRIPTION

B

t1

B

t2

B

t3

B

t4

B

t5

B

t6

B

t7

B

t8

Parallel

Input

Data

Sent

o

Positive true logic.

o

High Level Input Voltage

o

Low Level Input Voltage

.
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.
o

o

o
.
.

.

Level Input

Low
o.4

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Current

Standard 74L5244 input

Reset

Output Data Available - Normally high.

The external device will

to indicate
received

the data.

send new

data until n-Dffz, has returned high.

to the

Terminal

The

High Level Input Voltage
Low Level Input Voltage
Low Level Input
Refer to

the

Current

"Handshake

Input Data Available - Normall5r

external device will
indicate

that there

inputted to the

o

High Level Input

o

Low Level Input Voltage

o

Low

Level

Input

o

Refer

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is

parallel

Voltage

Current

(Vr")
(Vrr)
(Irr)

buffer.

pull

that it has

Terminal will not

(Vnt)
(Vrr)
(Irr)

Timing"

pull

this line

data ready to be

input.

(Vrrr)
[Vrr,)

(Irr)

Timing"

:

2

V min.

:

0.8 V max.

:

-2OO

p"A

this line low

:

2 V min.

:

V max.

0.8

:

2.8 mA

max.

section.

high. The

low to

:

2 V min.

:

0.8 V max.

:

1.8

mA max.

section.

max.

@

27

22
23
24

m-AV,

Ground

Data Received

.

o

.

.

Input

Reset
Terminal sends a negative-going
wide)
that the Terminal has received and is finished with
the data.
High Level

@

Low Level

@

Refer

this line to indicate to the external device

on

-+oo pA

(Ior).

4 mA

to the "Handshake Timing"

Available - Normally high. The

Data

pluse

:

Output

(Ior).

Output

Voltage

Voltage

(Vo")

(Vor)

2.7 V min.

:

0.4 V max.

section.

(:

25 p,S

Parallel

Handshake

Timing

Pictorial

2-18
handshake
port.

DAV0

I NAL

TERM

RDAVO

TXTTRNAL

DAVI

EXTERNAL

RDAVI

IERMINAL

shows

signals

the timing

associated

LOW LTVEL

RDAV-o RESEIS

LOW

waveforms

with

the

SAYS

"DATA

LOW LEVFL

DATS

LFVEL

SAYS

of the

parallel

SAY S

I/O

Handshake Timing

READY FOR

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HAVE DAIA

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Connections

serial I/O

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PIN

#

7

2

3

4

5 Reader

6 Reader

connector

of the

TTY
AND

Serial Out
Serial Out
Serial
Serial

Baud Rate

serial I/O

(ACTIVE

PASSIVEI

[+)
(-)

(+)

In
In

[-)

(+)

Start

(-)

Start

Out

chart describes

connector

SERIAL

the

on the

PORT NOMENCLATURE

EIA RS-232C

Serial

Serial In

Baud Rate

Out

Out

TTL

Serial Out
Serial In

Baud Rate

Out

B
9 Ground

Ground Ground

@

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Typical

Pictorial
Computer
Video

Pictorial
tween

System

2-L9

System Interface

Terminal

2-20

the

Video

reader/punch.

shows the

and

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shows

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Terminal

typical

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Standard)

computer.

I/O connections

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H9

VIDEO

TERMINAL

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paper

Typical

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Computer

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READIUSTMENT

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to suit

your

periods

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with

characters.

adjustments

maintain

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separately without

your

when

eyes

of time. Whenever

video

the

This section

need to

may
Terminal. Each of

ness and
affecting other

BRIGHTNESS
Adjust the display brightness

A dim display
the screen
you

change the

readjust
The BRIGHTNESS control

board) is shown
To adjust the brightness:

1.. Remove the cabinet shell and set it aside.

2. Fill the

3. Adjust the BRIGHTNESS control to

4. Reinstall the

contains

make to

Focus) can be adjusted

adjustments.

is

for

extended

focus.

the

desirable character brightness.

several

properly

the adjustments

easier on

brightness, it is also a

in Pictorial 3-1.

screen

cabinet shell.

that

your

for Bright-

needs.

own

you

look at

good

idea to

circuit

obtain

you

Video

To adjust the focus:

1. Remove the cabinet shell and set it aside.

2. Fill

3. Adjust the FOCUS

4. Reinstall

CENTERING

The display

should have the
it does

the top
To

adjust the

1. Remove

2. Fill

NOTE: Use an

a

careful

or

adjustments.

the screen with characters.

focus. Look

and

corners of the screen as

adjustment.

should be centered

same amount of space on the right

on the left, and the

it

as

does

on the bottom.

centering:

the cabinet

the

screen with

you

do not touch

the anode lead

the

at

the cabinet shell.

same amount

insulated screwdriver

when

control to obtain the best

characters at the

you

on the screen. It

shell and
characters.

the video circuit board

you

make the following

set it

edges

make this

as

of space on

aside.

and be

FOCUS

focus adjustment,

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whenever
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shown

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which should be made

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on the screen.

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the

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board) is

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to Pictorial
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center the
the

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use the minimum
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that is necessary.
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tabs

compromise

perfect

the

3-1

first

display

magnets

linearity

spread as far apart

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between

linearity.

cabinet shell.

rotate

and

one, then the

on the screen. Because

will affect the verti-

amount

perfect

the center-

other, to

of the

display,

of correction

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as

you

will have
centering

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of the

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the

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3.

4.

the height

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the

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while you
trol

at

the
appealing
play,

make

appear

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on the

of the

the

cabinet

screen

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watch

position

display.

sure

the

cabinet

display:

shell

with

characters.

control

the

display.

that provides

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all

twelve

screen.

shell.

and

set it

through

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prefer

character

a

large

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its

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