Paia Cs-87 Guide

CS-87

T.M.

CASSETTE INTERFACE

ASSEMBLY

AND

USING

MANUAL

Electronics,

Jnc.,

1020

W.

Wilshire

Blvd.,

Oklahoma

City,

OK

73116

2

PS-87

PARTS LIST

Prior

to

beginning

assembly,

check

the

supplied

parts

agamst

the

following

parts

list.

QUANTITY

1

l

1

2

8:500

Transformer

•1 mfd.

mylar

capacitor

16

IC

socket

8

IC

socket

1702A (POTSHOT) PROM

4042 In.tegrated

Circuit

24

IC

socket

8

header

TIL-209

LED

27K

resistor

(

red-violet-orange)

3.3K

resistor-

(orange-orange-red)

12

inch

length

of

4

conductor

ribbon

cable

lK

resistor

(brown;..black-red )

lOK

resistor-

(

brown-black-orange)

lOOK

resistor

(

brown-black-yellow

)

2N5139

transistors

miniature

phoneplug

Jf

you

should find any

parts

miss:ing, damaged,

or

otherwise

unusable,

contact

PAlA

Electronics,

Tech.

Services

for

replacement.

Along with you:r

request,

we

must

have

the

packer

number

from

the

parts

bag, and

the

order

number

under

which

this

kit

was

ordered.

The

parts

that

constitute

the

CS-87

cassette

interface

option

fit

entirely

on

the

8700

Computer/Controller

board.

CS•87 ASSEMBLY

Jnstall

the

following components on a PROPERLY OPERATING 8700

Computer

Controller

circuit

board.

00

NOT

proceed

with

the

assembly

of

this

option

until

the

8700

has

been

fully

verified

as

being

operational.

Remove

all

power

and

peripheral

connectors

from

the

8700

before

proceedilig with

the

CS-87

installation.

All

of

the

DOs and

DON

'T

s

that

w_ere

mentioned

in

the

assembly

manual

for

the

8700 apply

here

also.

Begin

assembly

by

installing

the

following

resistors:

ABC

1111,

1 1

.Silver

or

gold -

disregard

this

band.

PARTNUMBER

VALUE COLOR CODE

A-B-C

( )

R4

.....

„.

„ „

....

„ „ „

..

„

...

„.

„ „ „ 3300

ohms

„.

„ „ „ „ „ „

...

orange-orange-red

( ) R46, R47 (2 pai'ts) .

„.„.

„.

„ „ „

lOOK

„.

„ „

„.

„ „ „

„.

brown-black-yellow

( ) R48 •„ „ „ „ „ „ „ „

„.

„ „ „ „ „ „ 1000

ohms

„ „ „ „ „ „

.„

„ „

brown-black-red

()

R49, R50 (2

parts).„„„„„„„.

lOK

.„„„„„„„„„„„„„

brown-black-orange

( )

R5i

;„ „ „ „ „ „ „ „ „ „ „ ..„ „

..

„

„.

1000

ohms

„ „ „ „

„.

„

„.

brown-black•red

( ) .R52 „ „ ..„

„.

„

...

„

...

„

.....

„ ..

„,

27K „

„.

„ „

„.„.

„

....

„

„..

recl-violet-orange

Jnstall

the

single

ceramic

disk

(or

in

some

kits,

mylar)

capacitor

() c

10

„ „

„.

„ „ „ „ „ „ „ „

..

„ „ „ „ „ 0

.1

mfd.

There

are

:two

2N5139

transistors

wbich

are

used

for

relay

drivers

in

conjunction

with

the

POTSHOT C

assette

system

tape

motion

control

software.

lnstall

these

transistors

now.

(5)

( )

Q8,

Q9 (2

parts)

„ „ „ „

„.

„...

2N5139

~

The

single

Light

Emitting

Diode

provides

an

indication

that

data

is

coming

into

the

computer

from

the

cassette

player.

Orientation

of

the

LED

is

keyed

by

the

length

of

the

two lea.d.s,

the

sb.Qrt

lead

is

the

cathode

and should

be

installed

in

the

circuit

board

hole

marked

+-.

When

installing

the

LED,

leave

it

as

high

above

the

surface

of

the

board

as

possible

so

that

it

will

be

visible

above

the

displays

in

the

out-out

provided

in

the

8700 Keyboard

circuit

board.

When

installing,

leave

the

lead

of

the

LED

as

long

as

possible

for

ma.ximum

visibility.

()

D2

.„.„„„

..

'.

..

„„

.•

„„„„„„„.„.

TIL-209

Light

Emitting

Diode

4f

UTE

SllOllT

1

~EAO{+)

3

4

The

500:8

interstage

transformer

provides

coupling

between

the

cassette

recorders

output and

the

computer's

output. NOTE

that

while a

solder

pad

is

provided

for

the

center

tap

on

the

primary

side

of

this

transformer,

there

are

no connections

to

the

pad and

this

lead

may

be

clipped off

if

desired.

NOTE ALSO

that

some

transformers

may

have

three

leads

coming

from

both

sides.

On

these

devices,

the

primary

side

of

the

transformer

is

marked

with a

"P"

(which

on

some

transformers

comes

out nothing

more

than

a

black

smudge).

The

leads

coming

from

this

side

of

the

transformer

are

to

be

installed

in

the

circuit

board

holes

closest

to

the

edge

of

the

board

and

the

center

leads

may

be

clipped

from

both

sides

of

these

transf

ormers.

()

Tl

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

500:8

interstage

transformer

Install

the

following

sockets

at

the

positions

indicated.

As

with

the

8700,

observe

the

polarity

notches

of

the

sockets.

( )

24

socket

at

IC

18

()

16 pin

socket

at

IC

20

( ) 8 pin

socket

at

J9

lnstall

the

2

IC

1s

in

their

sockets.

WARNING

CMOS

PARTS.

Leave

these

parts

in

their

conductive

foam

carrier

until

ready

to

install,

do

not

wear

synthetic

clothing

during

installation.

Observe

orientation

notches

during

installation.

( )

IC

18.........

..

..................... 1702A POT-SHOT

Cassette

PROM

( )

IC

20

................................ 4042

qua.d

latch

A

piezo-electric

transducer

is

part

of

the

CS-87, which

produces

an audible

''beep"

providing

positive

indication

of

keyboard

activations.

The

software

required

to

drive

the

beeper

is

included

in

the

PIEBUG

monitor

program.

THE

BEEPER

IS

NOT

REQUIRED

FOR POT-SHOT OPERATION.

Depending on

the

final

installation

of

the

8700

system,

the

beeper

may

be

mounted

either

on the 8700

board

as

illustrated

shortly,

or,

for

max-

imum

volume, may

be

mounted

on a sounding

surface

external

to

the

computer.

If

you

elect

to mount

the

beeper

on the 8700

board,

pro-

ceed

as

follows:

( )

Solder

the

wire

connected to

the

center

silver

colored

disc

of

the

transducer

to the top end

of

resistor

R46

as

shown

in

figure

2 •

Be

careful

not

to

short

adjacent

conductors

during

soldering.

FIGURE 2

( )

Solder

the

wire

coming

from

the

copper

outer

disk

of

the

transducer

to

the

ground

conductor

at

the

bottom

of

ClO.

( ) Thoroughly

clean

the

back

of

the

beeper

and

the

top

of

the

transformer

Tl

and

using

contact

cement

or

other

adhesive

mount

the

beeper

to

the

transformer

as

shown

in

figure

3 . NOTE

that

the

beeper

mounts

off-center

on

the

transformer.

FIGURE 3

THIS COMPLETES INSTALLATION

OF

COMPONENTS

ON

THE 8700 CffiCUIT BOARD.

We

are

now

ready

to

prepare

connecting

cables.

The

header

to

which

the

cables

connect

is

somewhat

fragile

and

can

also

be

damaged

by

excessive

soldering

temperatures.

Because

of

the

variety

of

configurations

and

user-options

available,

pre-assembled

cables

are

not

supplied

for

the

cassette

interface.

While

wires

are

being

soldered

to

the

header,

some

sort

of

vise

must

be

used

to

serve

both

as

heat

sink

and to hold

the

pins

rigid.

If

a

vise

with

small

enough

jaws

is

.not

available,

one

may

be

rigged

from

a

pair

of

needle-nosed

pliers

held

closed

by

wrapping

a

rubber

band

around

the

handles.

PROVIDING

SOME

SORT OF MECHANICAL

SUPPORT

AND

HEAT SINK

IS

ESSENTIAL.

Do

not

attempt

the

following

assembly

steps

without

this.

ALSO,

proper

preparation

of

both

wires

and

header

will

simplify

assembly.

Pre-

tin

the

header

pins

before

soldering

the

wire

in

place

(note

that

only

the

"U"

shaped

part

of

the

pin to which

the

wire

will

attach

need

be

tinned -do

not

tin

the

portion

of

the

which

will

mate

with

the

socket).

Prepare

the

ends

of

the

wire

w

hieb

are

to

be

soldered

to

the

header

by

stripping

approximately

1/4"

of

insulation

from

its

end,

tightly

twisting

the

exposed

strands,

tinning

by

heating

the

strands

and flowing a

small

amount of

solder

into

them,

and,

finally,

by

clipping

the

now•tinned

exposed

wire

so

that

only

1/8"

extends

beyond

the

end

of

the

insulationa

( )

Prepare

one end of

the

4

conductor

ribbon

·

cable

by

first

separating

the

four

conductors

·

\1---------==,,,.--------'

into two

pairs.

Cut

1/4"

from

the

end

of

one

"-------~

i ;J

of

the

two

pairs.

Separate

into two

pairs

of

Figure

4

LV+p-

conductors

and

remove

1/

4"

from

the

length

of one

pair.

Separate

the

ribbon

into

four

conductors

and

strip

1/4"

of

insulation

from

the

end of

each

of

the

leads.

Tightly

twist

and

tin

the

exposed

conductors.

Finally,

clip

the

4 exposed,

tinned

conductors

so

that

only

1/16"

extends

beyond

the

ends

of

the

insulation.

Snip

Figure

5

6

1/

4"

of

insulation

from

the

end

of

each

of

the

.

conductors.

Twist

tightly and

tin.

After

tinning,

cut

so

that

1/16"

of

twisted

conductor

extends beyond

insulation.

( ) While p!ß.s

1-4

of the

cassette

connector

header

are

being

held

in

a

vise,

solder

the

two

shorter

leads

prepared

above to

pins

3

and 4 of

the

header.

( )

Similiarly,

while holding pins

5-8

in

a

vise,

solder

the

longer

leads

prepared

above

to pins 5 and 6.

I+

'lZ''71

~

:-:

~__.)

-----

2.~/

---~

Figure

6

-·

--

·--~·~~-~

tA'8

*LENGTH

AS

REQUJRED

Figure

7

The

length of

ribbon

cable

supplied

with

the CS-87 option

is

intentionally

longer

than

will

be

required

for

most

applications.

Trim

the

length of

the

cable

as

required

before

installing

the

miniature

phone

jacks.

( )

Separate

the

free

end

of

the

ribbon

cable

into two

pairs

of

conductors.

About 2

inches

of

separation

will

be

sufficient

in

most

cases.

Further

separate

the

two

pairs

into individual

conductors

(about

1/2

11

separation)

and

strip

1/4"

of

insulation

from

each

end

wire

before

twisting

and

tinning

the

exposed

strands.

( )

Locate

the

two

miniature

phone

plugs

supplied,

unscrew

the

cover

from

one and

slip

the

cover

over

the

end

of

the

pair

of

wires

coming

from

header

pins

3 and

4,

(the

threaded

end

of

the

cover

should

be

toward

the

free

end of

the

cable.)

Solder

one

of

the

two

wires

to

the

short

soldering

lug of

the

plug and

the

other

to

the

ground

frame.

(Polarity

is

not

important

here).

Screw

the plug

cover

back

in

place.

This

plug should

be

labeled

11

EAR

11

•

( ) Unscrew

the

cover

of

the

second

phone

jack

and

slide

it

over

the

remaining

two

conductors

of

the

cable.

Solder

the

wire

coming

from

pin 6

of

the

header

to

the

soldering

lug

of

the

phone plug and

the

wire

coming

from

5

of

the

header

to

the

ground

frame

of

the

plug. OBSERVE POLARITY. Screw

the

plug

cover

back

in

place.

This

plug should

be

labeled

"mic".

( ) Mate

the

cassette

connector

header

with

the

socket

J9

on

the

8700

board

(observe

orientation

-

if

assembled

as

above,

the

cables

will

naturally

exit

the

connector

over

the

nearest

edge

of

the

8700

board).

THIS COMPLETES ASSEMBLY

OF

THE CS-87 CASSETTE INTERFACE SYSTEM.

Re-connect

the

power

supply and

keyboard

for

an

initial

testing

sequence

to

follow,

hut

do

not

yet

totally

re-assemble

the

computer.

Testing

and Fa01i1i

arization

RECORDER

SELECTION

The

CS-87 "POT-SHOT"

cassette

option

has

been

carefully

designed

to

reliably

save

and

retrieve

programs

and

data

using

extremely

inexpensive, low-fidelity, audio

recording

equipment. While

the

Pbillips

format

cassettes

have

proven

to

be

exceptionally convenient

because

of

their

size

and

ease

of

storing

and

handling,

any

recording

scheme

(even

reel-

to-reel)

ca.n

be

used

with

equally

predictahle

results,

though

perhaps

more

hassle.

The

only

hard

and

fast

requirements

of

the

recorder

selected

are

that

it

have

ready

access

to

external

input

sources

(mic

and/or

aUX.:

inputs) and

some

provision

for

a high

level

output

(ear

and/or

ext.

spkr.

jacks).

The

presence

or

absence

of

an

Automatie

Level

Control

circuit

is

immaterial

to

the

operation

of

the

system.

A

"remote"

input

jack

capable

of

starting

and stopping

the

recorder

will

be

handy

if

you

tbink

you

may

be

adding

the

optional

tape

motion

control

relays

at

a

later

date.

We

bigbly

recommend

the

Realistic

CTR-34

recorder

sold

by

Radio-Shack

for

a

num.ber

of

reasons

including low

cost,

convenient

size

and

ready

availability.

TAPE

SELECTIOI

Consideration

should

be

given

to

the

kind

of

tape you

will

use

for

storing

digital

programs.

A

problem

known

to

magnetic

tape

media

as

"dropout"

can

scrub

your

programs.

Dropout

causes

the

·

signal

on

tape

to

fade

away

for

very

brief

periods

of

time

and

is

caused

by

fluctuations

in

the

tbickness

of

the

iron

o.xi.de

coating on

the

tape.

This

is

a

problem

that

can

go unnoticed when recordin.g

voice

or

music

but

the

loss

of

one

bit

of

data

is

fatal

when

trying

to

load

a

program

into

your

computer.

Therefore

you

should find a

brand

of

tape

that

is

reliable

and

stick

with

it.

Also

dropout

is

always a

problem

with

any

tape

at

tb,e

very

front

of

the

tape

where

it

is

connected

to

the

leader.

Avoid

tbis

area

by

skipping tb.e

first

15

or

30

seconds

of

the

tape

before

saving

the

first

program

on that

cassette.

TESTING

Connect

the

cassette

connectors

"mic"

plug

to

your

recorders

"mic"

(first

choice)

or

"aux"

(second choice) input

jacks

and

the

"ear"

plug to

the

"ear"

or

"ext

spkr"

jacks.

Apply power to

the

8700

Computer/Controller

and

verify

that

notbing

has

happened

during

installation

of

the

interface

system

to

change

the

normal

operating

characteristics

of

the

processor.

Since

we

will

be

initially

testing

the

system

by

storing

and

then

retrieving

the

counting demo

program

from

the

8700

Assembly

and

Using Manual,

entry

and execution

of

this

program

is

a

reasonable

vehicle

for

accomplisbing

tbis

initial

important

test.

Load

this

program

from

the

keyboard

and

verity

that

it

runs

properly

·'

7

8

DEIO

COUNTING

PRO

GRAM

ADDR CODE LABEL INSTRUCTION COMMENTS

0000 A9 00 BEGIN LDA #0 ;CLEAR ACCUMULATOR

0002

8D

20 08

REPEAT

STA $0820 ;DISPLAY ACC

0005

AO

00

LDY:/l=O

;CLRY

0007 A2 50 LDX

:/1=$50

;SPEED SETTING (IN HEX)

0009 CS

IOOP

INY ;DELAY LOOP

OOOA

DOFD

BNE

IOOP

;BRANCll UNTILY::o

oooc

CA DEX ;CHECK

SPEED

OOOD

DQ

FA

BNE

IOOP

;BRANCH UNTIL

X:o

OOOF

F8

SED ;SET DECIMAL MODE

0010 18 CLC ;CLR CARRY

0011 69

01

ADC

41=1

;ADD

1 TO ACC

0013

4C

02 00

JMP

REPEAT

;00

IT

ALL

AGAIN

SAVING

AND

LOADING

PROGRAMS

Before

performing

tape

operations,

there

is

some

information

that

the

computer

needs

to

successfully

complete

these

tasks:

1)

The

beginning

address

of

the

program

or

data

to

be

saved

or

loaded.

(4

hexadecimal

digits;

two

bytes)

2)

The

ending

address

of

the

block

of

data

that

is

to

be

saved

or

loaded.

(4

hexadecimal

digits;

two

bytes)

3)

A

file

ideutüier

number

(2

hex

digits;

one

byte)

4)

A

one

byte

(2

hex

digits)

indicator

for

either

a

load

operation

(11)

or

a

dump

operation

(DD).

All

of

this

information

is

entered

as

a continuous

string

of

digits

from

the

processor

keyboard.

THE

ENTER

KEY

IS

NEVER USED WHILE KEYING IN THIS INFORMATION.

Usini

the

counting

program

(which

you

should

have

entered

by

now)

as

an

example;

this

program

begins

at

location

$.0000 and

euds

at

location

$0015 (the

second

byte

of

the

operand

for

the

JUMP

at

location

$13).

Our

first

8

entries

from

the

keyboard

will,

there..;

fore,

be;

displey

shows:

15

Any

file

identifier

number

may

be

assigned

to

this

file

(except

00

which

has

special

significance

as

we

will

see

shortly).

Since

this

is

our

first

me

on

the

tape,

we

will

assign

it

number

01.

Your

keystrokes

will

be;

display

shows:

01

The

final

entry

will

be

the

LOAD/DUMP

"switch".

In

this

case,

for

a dump

from

the

computer

to

the

tape

recorder,

DD

(think of

the

D

as

meaning Dump). Y

our

keystrokes

f)tJMP

~

display

shows: dd

If

you

made

any

mistakes

while keying

in

the

preceding

information

you have no

choice

but

to begin

again

and key

in

the whole sequence;

BE<;„

Al>DR.

E/ID

Al>()li!.

· I'D DUMP

~~~~

o-o-o-0-0-0-1-s-o-1-D-D

When

the

preceding

data

has

been

entered

correctly,

you

are

ready

to

perform

the

<lump.

Put

your

recorder

in

the

"record"

mode and

start

the

tape

rolling.

Allow about

a

ten

second

interval

(see

TAPE SELECTION) and

press

the

8700's TAPE

control

key.

A

number

of

things

will

happen now. Simultaneously

the

display

should

clear

to

00

and

the

beeper

should begin to

produce

a

constant

tone (which

is

the

leader

and

synchroni-

zation

bits).

After

about

three

seconds

of

this

tone,

its

sound should change

slightly

(as

data

begins

to flow out) and

the

displays

should

begin

counting, showing

the

low

byte

of

the

address

of

the

data

currently

being

transferred.

lt

will

only

take

a second

or

two

for

the

program

to dump and when finished

the

displays

will

once

again

clear

to

00

and

the

tone

from

the

beeper

should

stop.

The

program

is

now

stored

on

tape

and

if

you

wish

you may

rewind

the

tape,

put

the

recorder

in

"play"

mode and

listen

to

the

tone

that

was

recorded

on the

tape

(it should

sound

very

similar

to what

you

heard

through

the

beeper).

Be

sure

to unplug

the

"ear"

jack

if

you want

to

listen

to

the

tape

-and plug

it

back

in

when

ready

to load a

program.

THE

BIG

TEST

Now

we

are

ready

to find out

if

it

worked.

Wipe out the

program

in

the

memory

of

the

computer

by

temporarily

disrupting

power.

Restore

power and

RESET.

Before

loading

the

program

for

the

first

time,

the

playback

level

of

the

recorder

must

be

set.

With many

tape

interfaces

this

is

a

hit-or-miss

proposition,

but

POT-SHOT

provides

the

level

indicating

LED D2 (

directly

above

the

displays)

for

this

purpose.

9

10

Turn

your

recorders

volume

control

up fully and

begin

playing

the

tape.

When

the

program

is

found

the

level-LE.D should begin. to glow

brightly.

(residual

clicks

and pops

on

tb.e

tape

may

cause

the

LED

to

wink

briefly

-

this

should

not

affect

the

operation

of

the

system).

When sustain.ed glow

is

observed,

quickly

(since

you

have

only a few

seconds

of

actual

material

recorded

on tape)

reduce

the

level

of

the

volume

ccntrol

until

you

see

a

slight

decrease

in

tb.e

brightness

of

the

LED.

This

should

be

the

proper

playback

level.

Loading

programs

follows

the

same

format

as

did tb.e

dump

with a contin.uous strin.g

of

keyboard

entries

indicating beginning

address,

ending

address,

ID

number

and

LOAD/

DUMP

switch.

The

first

8

entries,

begin.ning and ending

address;

B87.AZ>D{>.

E#D

AZll)ll.

~~

0-0-0-0-0-0-1-s

The

entries,

JDll:;

0-1

display

shows: 15

display

shows:

01

and finally

the

LOAD

"switch";

thin.k

of

the

1

's

as

L's

-

as

in

LOAD.

display

shows: 11

As

with

tb.e

dumping

procedure,

if

you

make

ar.iy

mistakes

in

entering

this

data

you

have

no

alternative

but

to

begin

again

and

enter

the

entire

sequence;

Rewind;

put

your

recorder

in

the

"play

mode,

start

tb.e

tape

rolling

and

touch

the

8700's

TAPE

key.

You should

immediately

hear

an

artoo-type

"bleep"

from

the

beeper

(it

will

sound

different

from

the

normal

key-stroke

beep) and

the

display

should

clear

to

oo.

Paia CS-87 Guide

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