North Star MDS-A Manuel utilisateur

Autres manuels pour MDS-A

1

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North

star

MICRO-DISK

SYSTEM

MDS-A

Contents

Parts

List

. . . . . . . . . . . • 3

Warranty

• . . . . . . . . . . . • • . 6

Theory

of

Operation

. . . . . • . 7

Assembly

and

Check-out

. • . . . . . . . .

15

System

Integration

.......•..

24

Drawings

. . . . . . . . . . .

..

.•

27

Copyright

1977,

North

Star

Computers,

Inc.

North

Star

MICRO-DISK

SYSTEM

MDS-A

Contents

• • • • • 3

. • • •

•.

••.

6

Parts

List

• • • • •

Warranty

• • • • • •

Theory

of

Operation

Assembly

and

Check-out

System

Integration

Drawings

• • • • • • •

• • . . • . .

..

7

. . . • . . . .

15

. . . .

..

..

24

. . • . . . . . • .

27

Copyright

1977,

North

Star

Computers,

Inc.

CAUTIONS

1.

Correct

this

document

from

the

errata

before

doing

anything

else.

2.

Do

NOT

insert

or

remove

the

MDS

controller

from

the

computer

while

the

power

is

turned

on.

3.

Do

NOT

insert

or

remove

IC's

from

the

board

while

the

power

is

turned

on.

4.

Be

sure

the

+5

volt

regulator

is

generating

+5

volt

output

voltage

before

installing

any

IC·s.

5.

Be

careful

to

insert

all

IC's

in

correct

positions

and

with

correct

orientation.

6.

Do

NOT

connect

or

disconnect,

mount

or

dismount,

or

in

any

way

physically

tamper

with

the

disk

drive,

power

board,

or

disk

controller

while

the

power

is

turned

on.

7.

In

some

cases

disk

drives

may

not

operate

properly

if

located

in

the

vacinity

of

TV's,

electric

motors,

or

other

sources

of

electrical

noise.

This

may

be

remedied

by

moving

the

disk

drive

away

from

the

noise

source

or

by

installing

the

disk

drive

in

a

grounded

cabinet.

North

Star

MICRO-DISK

System

2

PARTS

LIST

MDS

SYSTEM

PARTS

disk

~rive,

Shugart

SA-400

ribbon

cable

assembly

diskette,

blank

1

1

1

1

1

1

1

1

1

1

diskette,

pre-recorded

with

software

MDS

manual

DOS

manual

BASIC

manual

OEM

manual

MDS

controller

with

parts

power

board

with

parts

MDS

CONTROLLER

PARTS

1

printed

cirCuit

board

(5"

x

10")

1

bo1t,6-32x1/2"

1

lock

washer

1

nut,

6-32

1

heat

sink,

61018-14

1 5

volt

regulator,

7805

or

340T-5

1

crystal,

4MHz

23

16-pin

low

profile

IC

sockets

24

14-pin

low

profile

IC

sockets

1

34-pin

cable

connector

header

Integrated

Circuits

3

74LS00

1

1

74LS02

1

2

74LS08

7

1

74LS11

1

4

74LS14

1·

1

74LS30

2

2

74LS32

1

1

74LS42

2

5

74LS74

1

4

74LS109

2

1

74LS132

3

74LS157

74LSi60

74LS161

74LS164

74LS174

74LS257

7404

74.38

74166

74367

6301-1

3

North

Star

MICRO-DISK

System

or

74S287

Capacitors

1

1

1

1

18

Resistors

2

.4

2

100uf

electrolytic

6.8uf

tantalum

470pf

dipped

mica

33pf

dipped

mica

.047uf

ceramic

disc

680

ohm

150

ohm

2.2

K

Cl

C2

C3

C4

by-pass

Rl,R2

R3

,

R4

,

R5

,R6

R7,R8

MDS

POWER

BOARD

PARTS

1

1

1

2

1

1

1

1

3

3

3

1

4

1

1

2

2

printed

circuit

board,

3"

x

51/2"

1%

resistor,

RN55D

232

ohm

1%

resistor,

RN55D 1 ..

96

K

capacitors,

.047uf

ceramic

disc

regulator,

7805

or

340T-5

regulator,

LM317K

heat

sink,

295-2

heat

sink,

690-3-B

bolts,

6-32xl/2"

lock

washers

nuts,

6-32

power

plug

power

plug

pins

4

conductor

power

cable,

5

feet

strain

relief

bushing

bolts,

~-32xl

1/4"

spacers

North

Star

MICRO-DISK

System

4

POWER

SUPPLY

PARTS

(MDS-PS

option)

I

I

I

I

I

I

I

I

2

2

2

2

2

I

115v

cord

set,

8

feet

strain

relief

bushing

fuse

holder

fuse,

IA

3AG

toggle

switch

transformer

capacitor,

3000uf30wvdc

electrolytic

capacitor,

2500uf

15wvdc

electrolytic

rectifier

diodes,

MR501

3A

rectifier

diodes,

IN4002

IA

bolts,

6-32xl/2"

lock

washers

nuts,

6-32

hook-up

wire

CABINET PARTS

(MDS-CAB

option)

I

I

4

4

6

5

cabinet

base

plate

cabinet

cover

stick-on

rubber

feet

6-32

flat

head

screws

6-32

pan

head

screws

North

star

MICRO-DISK

System

WARRANTY

North

Star

Computers,

Inc.

warrants

the

electrical

and

mechanical

parts

and

workmanship

of

this

product

to

be

free

of

defects

for

a

period

of:

a)

90

days

from

date

of

purchase,

if

purchased

in

kit

form,

or,

b)

180

days

from

date

of

purchase,

if

purchased

assembled.

If

such

defects

occur,

North

Star

Computers,

Inc.

will

repair

the

defect

at

no

cost

to

the

purchaser.

This

warranty

does

not

extend

~

defects

resulting

from

improper

use

or

assembly

by

purchaser,

nor

does

it

cover

transportation

to

the

factory.

Also,

the

warranty

is

invalid

if

all

instructions

included

in

the

accompanying

documentation

are

not

carefully

followed.

Should

a

unit

returned

for

warranty

repair

be

deemed

by

North

Star

Computers,

Inc.

to

be

defective

due

to

purchaser's

action,

then

a

repair

charge

not

to

exceed

$30

without

purchaser's

consent

will

be

assessed.

Any

unit

or

part

returned

for

warranty

repair

must

be

accompanied

by

a

copy

of

the

original

sales

receipt.

This

warranty

is

made

in

lieu

of

all

other

warranties,

expressed

or

implied,

and

is

limited

to

the

repair

or

replacement

of

the

product.

North

Star

MICRO-DISK

System

6

THEORY

OF

OPERATION

The

North

Star

MICRO-DISK

System

(MDS)

controller

is

an

.

integrated

system

of

hardware

and

software.

It

is

designed

specifically

to

provide

a

complete,

compact

and

economic~l

disk

drive

controller

for

use

with

S-100

bus

8080

or

Z80microcomputer

systems

•.

HARDWARE

The

MDS

controller

is

implemented

entirely

from

medium

and

small

scale

TTL

integrated

circuits

and

PROM

memory.

The

entire

controller

fits

on.

a

single

51

x10"

printed

circuit

card.

The

following

diagram

sh6ws

the

general

organization

of

the

MDS

controller.

1.

Addr

ess

Buffe

r

sand

Selec

t

Log

ic

• 'l'he

six

teen

,add

ress

1

ines

are

buffered

with

Schmidt

trigger

inverters

(4G,

5G,

6G)

to

provide

additional

noise

immunity.

The

high

order

8

address

lines

are

used

by

the

board

select

PROM

(7G)

to

determine

if

the

current

memory

reference

is

addressing

the

controller

board.

The

low

order

eight

address

lines

are

used

to

present

data

and

commands

to

the

controller.

The

use

of

these

bits

is

determined

by

the

outputs

of

the

board

select

PROM.

2.

write

Data

Logic.

If

the

controller

is

issued

a

write

data

byte

command,

then

the

low

orde~

eight

address

bits

are

interpreted

as

data

to

write

and

are

gated

into

the

write

shift

register

(3G).

The

controller

will

place

the

CPU

in

a

wait

state

unt.il

the

shift

register

is

empty

and

only

then

clock

the

new

data

into

the

shift

register.

The

output

of

the

shift

register

is

combined

with

clock

pulses

and

encoded

(using

FM

encoding

method)

for

output

to

the

disk

drives.

3.

Read

Data

Logic.

Raw

data

from

the

disk

(READ

DATAl)

is

buffered

with

a

Schmidt

trigger

and

formed

into

one

clock

period

pulses

(NICE

READ

DATA)

,synchronous

with

the

controller

clock(LCLK/).

'l'he

clock

and

data

pulses

are

separated

by

the

data

separation

logic

(2A

and

associated

gates)

and

the

resulting

data

bit

is

saved

in

a

flip-flop,

and

then

it

is

clocked

into

the

8

bit

shift

register(5E).

The

read

shift

register

outputs

are

multiplexed

with

the

status

bits

(2F,

4F,

4E)

and

driven

onto

the

Data

Input

Bus

(SF,

6F).

7

North

Star

MICRO-DISK

System

8

DI

Bus

Address

Bus

16

256/512

Byte

MPXR

ROM

8

8

Status

Bits

8

8-bit

shift

reg

Board

Select

Data

,

Control

Lo~ic

Encoder

Controls

to

Disk

Controls

from

Disk

Data'

to

Disk

MDS

Controller

Block

Diagram

North

Star

MICRO-DISK

System

(to

8(80)

8

8;"bit

shift

reg

Data

Separator

Data

from

Disk

8

4.

On

Board

PRONe

Controller

software

(8080

or

Z80

machine

code)

is

stored,

in

part,

in

two

on-board

4x256

bit

bipolar

PROMs.

These

PROMs

provide

256

bytes

of

memory.

Replacihg

these

PROMs

with

pin

compatible

4x512

PROMs

would

provide

512

bytes

of

on-board

program.

The

8

low

order

address

bits

address

the

PROMs.

The.

PROM

outputs

are

driven

onto

the

Data

Input

Bu~.

5.

Clock

Circuit.

The

crystal.

controlled

clock

circuit

(SA,

58,

4A,

6A)

provides

2

MHz

clock

signals

to

synchronize

all

the

control

circuitry.

6.

Read,

Write

Control.

A

read

or

write

command

sequence

begins

with

detection

of

a

sector

pulse.

A

read

or

write

command

must

be

issued

to

the

controller

within

a

96

microsecond

window

after

the

sector

pulse.

Writing

data

begins

at

the

end

of

the

window

•.

The

controller

writes

one

byte

of

zeros.

Fifteen

additional

bytes

of

zeros

are

written

by

the

software

commands

followed

by

a

synchronization

character,

256

bytes

of

data,

and

a

cyclic

check

character.

writing

stops

at

the

next

sector

pulse.

Reading

starts

some

time

afte~the

end

of

the

window

so

as

to

be

in

the

middle

of

the

wr

i't

ten

zeros.

A

read

sequence

starts

in

"hunt"

mode.

When a

sync

character

is

detected,

the

controller

enters

"body"

mode.

Whehthe

software

issues

a

read

command

to

the

controller,

the

controller

will

put

the

CPU

into

the

wait

state

until

the

read

shift

register

is

full.

The

read

loop

must

complete

in

less

than

64

microseconds.

7.

Command

Decode

Logic.

When a .command

address

is

issued

to

the

controller,

the

8

low

order

address

bits

are

decoded

to

determine

which

command

actions

are

to

be

taken

and

which

disk

cQntrols

should

be

performed.

See

the

COMMANDS

section

for

details.

8.

Counters.

The

counters

ID,

2D,

IE,

and

2E

provide

the

timing

for

write

data

shifting,

data

encoding

and

counting,

and

read

and

write

command

sequencing.

The

counter

IG

is

the

sector

position

counter.

The

outputs

of

2E

provide

ps~udo

sector

pulses

in

case

no

diskette

is

inserted

in

the

drive

or

the

drive

motor

is

off

and

also

allow

discrimination

between

9

. .

sector

holes

and

the

index

hole.

The

counter

IF

is

used

to

count

disk

revolutions

to

determine

when

to

cause

automatic

motor

off.

The

counter

28

is

used

to

count

bits

while

reading

data.

North

Star

MIC'RO-DISK

System