North Star MDS-A-O User Manual

NorthSbrCompumlnc

2547 Ninth Street

Berkeley,

Co.

94710

Introduction.

Cautions

Limited

Out
Limited

of

Warranty

Hardware

Software
Software
Parts

List

Assembly

Figure

lA:

Assembly

System

Theory

Integration

of

Appendix

Schematic

MICRO-DISK

DOUBLE

Table

SYSTEM

DENSITY

of

Contents

.....

. . . . . .

Warranty

Repair

. .

Warranty

License

. . . • .

. . . . . . . .

Information

Identification

and

Check-out

• • .
Instructions

. • • • . . . .

Operation

1:

Pulse

Drawings

Signal

• • . • • • . •

MDS-A-D

•

of

Components

•••••

Detection

10

11

22

27
35

36

2

2

3

3

4

4

5

8

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l

,

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I

Copyright

1978,

North

star

Computers,

Inc.

MDS-D
REVISION

25010

;

2

The

North

disk

system

includes

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provided

System,

programs.

drives.
on

a

diskette,

storage.

are

available

If

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entire

Information
purchased
Assembly

Star

the

on

BASIC

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Each

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have
manual.

the

section.

Micro-Disk

for

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section

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with

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drive

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sure

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to

before

in

INTRODUCTION

System

5-100

(MDS-A-O)

bus

board,

and

documentation.

includes

capable

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up

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carefully
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ASSEMBLY

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This

IC

hold

each

will

and

a
pin

it

iron

are

RESISTOR

To

install

in

the

leads
Then

holes
side

resistors

on

the
close
from

in

making

PRINTED CIRCUIT

The

white
side
inserted
other
identified
followed
coordinates
can

be

intended

leads

are

insert

in

of

the

solder

to

flying

of

a

side

found

AND

CAPACITOR INSTALLATION

resistors

to

already

the

the

PC

board

or

capacitors

the

board

bits

jumper

component
printed

from

(solder

by.

by

a

of

on

locations

or

fit

the

appropriately

leads

board

side

of

to

of
as

as
and

keep

the
possible.

wire.

connections.

BOARD

LAYOUT

layout

circuit

this

side

side).
two-character
letter

the

indicating

location.

styrene

on

the

capacitors,
PC

board

far

as
spread
the

part

has

been

board

Save

legend

(PC)

board.

(component

Locations

codes

Note

padS

PC

in

board.

first

hole

spaced

possible

the

leads

in

inserted,

and

snip

Use

caution

the

lead

is

printed

side)

on

as

marked

the

horizontal

that

positions

make

spacing.

and

do

through

slightly

place.

then

off

clippings

All

components

and

the

in

North

corresponding

right

(Some

not

After

solder
the
to

avoid

on

the

soldered

PC

board

on

the

and

angle

need

the

correct

on

a

excess

for

component

are
board:
vertical

Star

bends

capacitor

bending.)
the

solder

group

the

of

leads

leads

eye

injury

later

are
on

the

a

kits,

to

their

as

use

digit

IC's

pin

numbering

When

viewing

facing

viewing

from

9

left

down),

the

to

conventions

the

component

pins

solder

right.

North

1,2,

side

...

of

Star

for

the

side

,

the

of

50

board,

MICRO-DISK

8-100

the

range

edge

board

from

pins

System

pins

(with
left
100,

to
99,

are

the
right.

.•.

as

pin

,

follows:

edge
When

51

range

<·========0100MFO)

positive

(+1

lead

\.};...

Axial

ElecHolytic

.

lead

Capacitor

====ODD)====~

Resistor

=

Pin 1

---P"

Resistor

Network

·ii

.1

"

••

Transistor

Regulator

(To-92l

,

Quick-Connect

Lug

and

.047 )

Ceramic

Disc

Capacitor

Ii

I

Dipped

Mylar

Capacitor

'I

I,

I

Dipped

Mica

Capacitor

Regulator

(To-220)

)

+
+

+

-

II~t;"

~

(+l lead

Dipped
Tantalum
Capacitor

,

I

Integrated

Circuit

{Ie}

Figure

IC

Socket

lA.

Identification and orientation of components.

DIP

i

l

I

Header

=:

:.f

,

, .

,

, ,

ASSEMBLY

AND'CHECK-OUT

INSTRUCTIONS

ct,

:.'.

~

j,'t

DISK

For
steps.

NOTE:
heat

silk

AL

A2.

'3

n •

A4.

CONTROLLER

best

results,

Orient
sink
screen

Insert
70,
the
the

Similarly,

sixteen-pin

IC's

Similarly,

Install
indicated

the

area

legend
and

80,

Assembly

layout

will

resistors

the

90,

and

BOARD

assemble

board

to

the

is

solder

100,

Information

legend

install

socket

be

inserted

install

solder

by

the

is

ASSEMBLY

the

with
left.
on

the

and

with

layout

.5

the

5

110,

the

is

used

into

the

the

inches.

the

The

component
twenty-pin

pin

19

22

31

legend.

MDS

controller

edge

following

section.

1

sixteen-pin

at

this
fourteen-pin
resistors

connector

component

toward

location

socket.

side.

IC

Orient

The

using

toward

side

sockets

the

the

IC

in

hole

is

procedure

them

bottom

sockets.

lAo The two

IC

sockets.

the

locations

spacing

the

now

at

as
of

following

you

and

up.

locations

given
shown on
the

board.

A

8-pin

for

all

the

The

in

11

Resister

( ) Rl

R2

( )

( )

R3

( )

R4

( ) R5

(

),

R6

( )

R7

( )

RB

( )

R9

( ) RiB

( )

Rll

( )

R12

( ) R13
( ) R14

R15

( )

( )

R16

( ) R17

( ) RiB

( )

R19

North

Location

lA

lB
lB
2A

2A

2B
2B
2B

3A

3A

3A

3A

3C

3C

3C

3C
4B

14A

4A

Star

Value

3.3K

3 • 3

5.6K

27K
27K

5.6K

6.19K

2.2K
47B

47B

5.6K

3.6K

6.BK

13K

27K

6.BK

2.2K

6BB

9.1K

MICRO-DISK

Size

1/4W

1/4W
1/4W
1/4W
1/4W
1/4W

1%

1/4W
1/4W

l!4W
1/4w
1/4W
1/4W
1/4W
1/4W

1/4W

1/4W

1/4W

1/4W

1/4W

System

Color-code
erg-org-red

org-org-gld

grn-blu-red

red-vio-org

red-vio-erg
grn-blu-red
blu-brn-wht-brn

red-red-red

yel-vio-brn

yel-vio-brn

grn-blu-red

org-blu-red

blu-gry-red

brn-org-erg

red-vio-org

blu-gry-red

red-red-red
blu-gry-brn
wht-brn-red

( ) R20
( ) R21
( ) R22
( ) R23
( ) R24

l l

~~~

( 1 R27 12A
( 1 R28 12A
( ) R29
( ) R30 14A

5A
50
6A
60
60

ii~

12A

-J'

1

i

,

-1

10K
470
15K

2.

2K

330

~~~ij~~ ~~~=~~;;=~;~

150

15~

150
150

1/41'1
1/41'1
1/41'1
1/41'1
1/4W

1/41'1
1/41'1
1/41'1
1/41'1

brn-blk-org
yel-vio-brnt
brn-grn-org

red-red-red':

org-org-brn

brn-grn-brn
brn-grn-brn;
brn-grn-brn
brn-grn-brn

,

l

,.;~:

>t<;

J

"

,t~

A5.

Inser~

indicated
have

lead

tantalum

capacitors

significant

picofarads.

330pf.

in

The
disc

installed

asterisks

~n:3:o1de/::e

by

the

layout

polarity,

in

the

capacitors

These

parentheses

Capacitor

( )

Cl

( ) C2

( ) C3

( )

C4

( 1

C5

( 1 C6

( )

C7

( ) C8

( 1

C9

( )

C10

( )

Cll

( ) C12

( ) C13
( ) C14

( ) C15

( )

C16

( )

C17

( 1

C18

( ) C19

( )

C20

( )

C21

remaining

capacitors

In

hole

are

digits

Thus,

(*)

so

marked

marked

alternate

after

Location

lC
lC

10
10
20

20

lA
18

lC

2A
28

3C

38

38
4A

5A

50

50

118

15A

15A

eighteen

are

the

oval

on

the

39

care

is

with

followed

223

the

bypass

layout

must

marked

means

capacitor

capa:::ors

legend.

be

taken

with

a

plus

with

a

3-digit

by a

22lHHlpf

capacitor

capacitor

Value

6.8uf

2.2uf

6.8uf

2.2uf

2.2uf

2.2uf
.047uf(473)

100pf(101)

.022uf(2231
.01uf(1031

330pf

200pf(201)

.022uf
200pf(2011
330pf(33111%

.022uf(223)
330pf(331)

47pf
100pf(1011

33pf

470pf(471)

.047uf(473)

capacitors

legend.

The

a "+"

power

markings

value.

(331)

(223)

or

locations

in

1~::

tantalum
to

sign.

code

or

1%

.05uf(5~3)

and

10ca:::::rn-brn,.jj

capacitors

insert

The

sign.

consisting

of

ten

expressed

.022uf

are

Type

tantalum
tantalum
tantalum

tantalum
tantalum

tantalum
dipped
dip?ed
dipped

dipped

dipped

dipped

dipped

dipped

dipped

dipped

ceramic

ceramic
ceramic

diT?ped

dipped

should

marked

the

"+~

Some

and

given

mylar

mica
mylar
mylar

mica
mica
mylar
mica
mica

mylar

disc

disc
disc

mica

mica

ceramic

be

with

positive

lead

of

331

means

below

, ,

I

_~::_:;

of

1;

two

in

~

.1:

-.~:
~;

'

't'

~

J

-a-

,

"

l

•

f

,

"

f

I-

North

Star

MICRO-DISK

System

12

" .

,

~.-

"

..

'to

;-

".,.

n:

~

..

"

.~

,

A6.

Insert

indicated

with

indicated

a

Diode

and

band

(

( 2

( 3
( 4

( 5

( 6

-by

by

1

solder

the

is

the

the

layout

the

layout
Location

2A
2A
2A
2A

3A

3A

six

cathode

.

IN4148

legend.

end

legend.

diodes

The

and

must

Orientation

band
band

band
band

band

band

at
at
at
at
at
at

end

left

right

left

right

right

left

at

of

be

the

loc3tions

the

oriented

diode

marked

as

,

,.-.;.-

••

fl:

I

h'

AS.

Insert

leads

board.

strapped

lead

crystal

which

Install

locations

of

the
into
up.
to
bottom

regulator,

Now

NOTE:

generally

or

Install

orienting

the

the
Don't

the

solder

you

flat

and

so

5

PC

to

Heat

will

that

In

to

case.

each

Ie

volt

correct

board
top:

needed.

the

the

edge

solder

the

addition

the

is

soldered

of

and

regulator

solder

6-32

lock

the

regulator

sink

crack
12

volt
regulator
indicated

the

crystal

to

PC

board

the

two

1D

as

holes

yet.

so

that

machine

washer,

grease

Don't

the

crystal

the
to

follows.
while

may

PC

78L12

will

two

with

the

heat

90

degrees

Fasten
the

and

leads.

be
tighten
board.

regulator
so
on

at

lie

leads,

a

piece

pads

sinks

the

the

following
screw
nut.

used

that

the

layout

location

parallel

on

and

Bend

such

machine

heat

head,

Tighten

though

the

the

the

of

either

5

down

that

sink

sequence

PC

machine

(Q3)

flat

legend.

15A.

with

crystal

clipped

side

volt

the

the

screw

and

board,

the

it

is
screw

near
edge

Bend

the

should

the

PC

resistor

of

the

regulators

three

leads

holes

regulator

results

heat

machine

not

too

location
corresponds

be

at

leads

go

line

from

sink,

screw.

-.

tight

28,

to

:A10.

All.

13

Install
The
board
toward

Be

sure
board
sure
turn
to

the
and
pin
and

right

and

the

into
the
on

ground

at

2C

7

of

remove

arid

the

board

the

both

solder
angle
the

top

power

a

power.

pin

the

bent

straight

of

the

is

computer

is

properly

plane

14.
the

LF356

disk

North

the

34-pin

pins

ends

board.

off

motherboard

Check
at

the

Check

controller

Star

cable

should

of

the

and

then

seated

for

+5

left

for

and

MICRO-DISK

+12

the

of

3080.

from

connector

be

4nserted

pins

plug
100-pin

in

volts

the

volts

the

System

should

the

connector.

the

connector

±5%

board)

±5%

Turn

motherboard.

into

disk

(with

at

off

header

the

be

pointing

controller

reference

at

3C

location

the

(J2).

and

pin
power

PC

Be

then

16

IA

at