Compupro Disk 3 User manual

A243

$20.00

DISK3

TECHNICAL

MANUAL

HARD DISK CONTROLLER

FOR ST-506 COMPATIBLE DRIVES

DISK

3

TECHNICAL

MANUAL

Copyright

1983

CompuPro

Hayward,

CA

94545

File

name:

DISK3.MAN

Document

# 11945

Board

No. 194,

Revision

G

First

edition:

October

1983

Latest

edition:

October

1984

DISCLAIMER

-

CompuPro

makes

no

representations

or

warranties

with

respect

to

the

contents

hereof

and

specifically

disclaims

any

implied

warranties

of

merchantability

or

fitness

for

any

particular

purpose.

Further,

CompuPro

reserves

the

right

to

revise

this

publication

and

to

make

any

changes

from

time

to

time

in

the

content

hereof

without

obligation

of

CompuPro

to

notify

any

person

of

such

revision

or

changes.

Trademark:

DISK

3;

CompuPro.

-Registered

Trademark:

CP

1M;

Digital

Research,

Inc.

All

rights

reserved.

No

part

of

this

publication

may

be

reproduced

or

transmitted

in

any

form,

or

by

any

means,

without

the

written

permission

of

CompuPro.

Printed

and

assembled

in

U.S.A.

CONTENTS

How

to

get

your

DISK

3

up

and

running

Installation

procedures

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

1

Testing

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

6

Trou

bleshooting

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

8

DISK

3

Technical

Information

In

trod

uction

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

9

Hardware

interface

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

9

Software

overview

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

10

Software

interface

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

10

Specify

format

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

16

Appendix

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

17

Hard

ware

Section

Logic

diagram

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

20-23

Parts

list

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

24

Componen

t

la

you

t.

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

25

HOW

TO

GET YOUR

DISK3

UP

AND

RUNNING

WITHOUT

READING

THE

MANUAL

Eager

to

get

your

new

DISK

3

running?

Careful

installation

is

needed

to

assure

proper

function

of

this

board.

DISK

3

INSTALLATION

PROCEDURES

(For

use

with

the

CompuPro

H40

Hard

Disk

Subsystem.)

STEP

1.

UNPACK

DISK

3

BOARD.

Along

with

the

board,

you

will

find

an

extra

jumper

shun

t

and

two

card

ears

in

the

plastic

bag.

STEP

2.

INSTALL

CARD

EARS.

a)

Hold

the

board

so

the

component

side

is

toward

you. (See

diagram

below.)

b)

Insert

the

peg

on

the

card

ear

into

the

hole

in

the

right

corner

of

the

board.

Fold

the

ear

over

the

board's

edge

until

the

ear's

hole

snaps

over

the

peg

(make

sure

the

long

edge

of

the

ear

is

along

the

top

edge

of

the

board.)

c)

Repeat

for

left

ear.

Figure

1:

DISK

3

(Component

Side)

card

ear

STEP

3.

SET

SWICHES.

Check

the

DISK

3

switch

settings

(see

figure

below

for

the

location

of

Sl.

We

recommend

that

switch

positions

which

are

NOT

USED

be

set

off.

(The

switch

settings

are

for

MP/M

TII 8-16'"

Version

2.1

I

and

Concurrent

DOS 8-16.

Check

your

software

documentation

for

the

latest

update

on

the

switch

settings).

The

black

dot

(.)

shows

which

side

of

the

switch

should

be

down.

SWITCH

1: S1

OFF

ON

m:::::J

1

c::::m

2

c:::;:mJ

POSITION

SET

IT

1

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

OFF

2

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

ON

3

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

ON

4

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

OFF

5

........•........

ON

6

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

ON

7

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

ON

m:::::J

4

c:::::m

5

c::::m6

c:::::::m

7

~8

8

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

(NOT

USED)

S1

J7

J8

J10

Figure

2.

DISK

3

(jumper

and

switch

location)

2

STEP

4.

CHECK

JUMPER

SHUNT

CONNECTORS

Make

sure

the

jumper

shunts

are

installed

as

listed

below.

(See

figure

2

on

for

locatio'n

of

jumper

connectors

labeled

J7, J8, J9,

JI0

and

Jl1).

J6

is

unused.,

JUMPER

SHUNTS

n01Ch--..'

A

jumper

shunt

is a

small

plastic

part

used

to

connect

two

pins

on

the

jumper

connector.

Jumper

shunts

should

be

installed

notch

side

down.

ACB

~

J7

should

be

connected

from

B-C.

•

I!:!l

I!:!l.

~

J8

should

be

connected

from

A-C

.

•

(Ol

•••••••

.l!.I

•••••••

01234567

o~

J9

is

for

the

interrupt

selection.

Use

position

I

for

VII.

1

••

""

2

••

''''

JI0

selects

the

data

bit

for

reset.

3

••

The

top

position

is

for

DO.

4

••

5

••

6

••

7

••

P3

••

P2

U

P1

U

Jumper

the

middle

two

positions

of

Jll

PO

••

J11

IF:

The

board

is

not

correctly

jumpered.

THEN:

Use

a

pair

of

needle

nose

pliers

to

gently

remove,

and

carefully

replace

the

jumper

into

its

proper

location.

jumper

shunt,

..

~:::=---------

3

!

CONNECT

THE

CABLES

FROM

DISK

3

TO

THE

HARD

DISK

SUBSYSTEM.

Place

your

hard

disk

subsystem

near

your

computer

enclosure.

Make

sure

it

is

on

a

stable

surface

to

reduce

vibration

when

the

computer

is

working.

Make

sure

it

is

not

located

near

telephones

and

magnetic

fields

(like

those

created

by

a

generator).

If

you

need

to

remove

the

cover

from

the

computer,

do

not

use a

magnetic

screwdriver.

CABLE

INSTALLATION.

Cables

must

be

connected

correctly.

Be

sure

that

when

you

assemble

the

.cables

the

red

stripe

is

always

on

the

same

side,

and

the

connector

plugs

are

inserted

properly.

You

could

connect

these

cables

in

any

order.

We

recommend

the

following

procedure.

WARNING:

BEFORE

YOU

OPEN

YOUR

COMPUTER

ENCLOSURE

ALWAYS MAKE

SURE

THE

POWER

IS

OFF

AND

IT'S

UNPLUGGED.

REMOVE

RINGS,

WATCH, ETC.,

\VHICH

CAN

CONDUCT

ELECTRIC

CURRENT.

DO

NOT

.

TOUCH

THE

POWER

SUPPLY.

STEP

1.

IDENTIFY

CABLES.

CBL14 -

short

20-pin

cable.

CBL17 -

long

20-pin

cable.

CBLl3

-

short

34-pin

cable.

CBLl6

-

long

34-pin

cable.

STEP

2.

ATTACH

THE

CABLES

TO

THE

BACK

PANEL

OF

COMPUTER

ENCLOSURE.

a)

Select

CBL14.

Insert

male

connector

into

the

"Drive

1"

slot

of

the

computer

enclosure.

The

pins

face

outward

and

the

red

stripe

on

the

cable

is

on

the

side

shown

on

the

back

panel

illustration

below.

DODD

o

~

0

o\.=------.J

0 0

\.=------.J

0 0

\.=------.J

0

o o

~

0

o\.=------.Jo

0

\.=------.J

0 0

\.=------.J

0

s'--

___

--'

o S ?

Hard Disk Cable Connector

\ 1

000

red

stripe

CBL14

inside

CBL

17

outside

red

stripe

--:---t--_

CBL

13

inside

CBL16

ou

tside

Figure

3.

COMPUTER

ENCLOSURE

-

(back

panel

outside)

4

INSIDE

ENCLOSURE

OUTSIDE

ENCLOSURE

b)

Attach

connector

to

back

panel

with

the

hardware

that

came

with

the

system.

(Nut/lockwasher

inside

and

jack

screw

Iflat

washer

out-

side

the

enclosure.)

c)

Select

CBLI3.

Insert

the

male

connector

into

the

slot

inside

the

back

panel

la

beled

for

the

34-pin

hard

disk

cable.

(See

diagram

on

the

d)

Attach

the

CBL13

connector

to

the

back

panel

as

in

step

b)

above.

STEP

3.

INSERT

THE

DISK

3

INTO

THE

MOTHERBOARD.

Place

the

board

into

the

slot

closest

to

the

back

of

the

enclosure.

The

edge

connector

is

offset,

so

that

the

DISK

3

will

fit

~

with

the

component

side

facing

the

form

panel

of

the

enclosure.

PUSH

DOWN

GENTLY

UNTIL

THE

BOARD

IS

FIRMLY

INSTALLED.

STEP

4.

ATTACH

THE

CABLES

TO

THE

DISK

3.

(Face

the

component

side

of

the

board.)

a)

Pick

up

the

female

connector,

of

CBL

14.

Keep

the

red

stripe

on

the

cable

to

the

left.

b)

Gently

slide

the

connector

onto

J

1.

(See

component

legend

on

the

board

or

diagram

on

page

2

for

location

of

J 1.)

c)

slide

the

connector

of

CBL13

onto

J5. (See

component

legend

on

the

board

or

diagram

on

page

2

for

location

of

J5.)

Keep

the

red

stripe

on

the

left

side

on

the

connector.

5

STEP

5.

ATTACH

THE

CABLES

TO

THE

HARD

DISK

SUBSYSTEM.

a)

Take

CBL17

and

insert

one

end

into

the

20-pin

connector

you

attached

to

the

enclosure.

Match

the

red

stripes.

b)

Insert

the

other

end

of

CBL17

into

the

back

of

the

hard

disk

enclosure

in

the

20-pin

connector

(red

stripe

on

the

side

away

from

the

fan).

c)

Now

take

CBL16

and

insert

one

end

into

the

34-pin

connector

you

attached

to

the

enclosure.

Match

the

red

stripes.

d)

Insert

the

other

end

of

CBL

16

in

the

34-pin

connector

on

the

back

of

the

hard

disk,

with

the

red

stripe

away

from

the

fan.

TESTING.

IMPORT

ANT

NOTE:

Make

sure

the

50-pin

floppy

disk

drive

cable

is

attached

from

the

disk

enclosure

to

the

DISK

lA

board

before

the

CONFIDENCE

TEST

is

run.

IT

IS

NECESSARY

TO

RUN

A

CONFIDENCE

TEST

BEFORE

YOU

BEGIN

TO

USE

YOUR

NEW

HARD

DISK

SUBSYSTEM.

Follow

the

steps

below

(using.

the

floppy-based

operating

diskette)

to

forma

t

the

hard

disk

and

run

the

drive

confidence

test.

(The

operating

system

diskette

sent

by

CompuPro

is

set

up

to

run

the

floppies

only.)

TO

BEGIN

THE

CONFIDENCE

TEST

(This

test

performs

a

rigorous

examination

of

the

hard

drive

and

prepares

an

error

map

which

is

stored

on

the

hard

disk.

The

bad

sector

relocation

is

done

at

the

end

of

the

test.

It

takes

approx-

ima

tely

16

hours

to

complete.)

STEP

1.

Turn

on

your

system.

STEP

2.

Insert

a

single-user

(CP

/M~type)

operating

system

diskette.

STEP

3.

Type:

DISK3

ALL

then

press

the

return

key.

6

STEP

4.

The

screen

tell

you

that

the

DISK

3

will

format

for

a

Quantum

540

(Q540)

disk

drive,

then

ask

you

if

you

want

to

format

the

disk.

If

you

do,

type

"Y",

press

the

return

key,

and

the

disk

will

beging

to

format.

(Go

to

STEP

6.)

If

you

want

to

format

for

another

hard

disk,

type

"N",

then

a

list'

of

parameters

will

appear.

STEP

5.

Enter

the

correct

parameters,

and

when

"Arc

all

the

above

values

correct

(Y

or

N):"

appears,

answer

Y,

then

press

the

return

key.

STEP

6.

The

test

formats

the

drive,

verifies

its

contents,

and

performs

the

data

and

seek

tests.

You

may

hear

a

lot

of

noise

during

the

seek

test,

but

this

is

normal.

DO

NOT

STOP

THE

TEST!

Completing

this

test

is

your

best

guarantee

that

the

DISK

3

and

the

hard

disk

subsystem

will

work

properly.

After

the

test

is

complete,

DO

NOT

REFORMAT

the

disk

as

this

will

destroy

the

bad

sector

map.

TROUBLE?

IMPORTANT

If

you

have

been

using

an

SA

11

OO-type

hard

disk

and

are

now

going

to

use

the

SAl

IOO-compatible

DISK

3,

you

will

have

to

copy

your

files

from

your

hard

disk

on

to

floppies,

then

ref

orma

t

the

hard

disk

as

described

above

and

copy

the

files

back

onto

your

hard

disk.

You

do

not

have

to

do

this

if

you

have

been

using

an

ST506-type

hard

disk.

It

is

acceptable

to

have

some

hard

errors,

but

you

should

have

no

more

than

a

total

of

40.

Cylinder

0

should

have

no

errors;

no

head

should

have

more

than

10

errors;

no

head

should

have

more

than

4

tracks

with

multiple

defect

errors;

and

there

should

be

no

more

than

1

error

per

mega

byte

of

unf

orma

tted

storage

(40

errors).

7

TROUBLESHOOTING.

IF:

You

are

getting

errors

on

every

cylinde~

during

the

verify,

the

20

cable

is

probably

reversed.

THEN:

Stop

the

test

by

pushing

the

RESET

button.

Check

your

cable

to

make

sure

it

is

correctly

attached.

,

If

it

is

not,

attach

it

properly

and

start

the

test

again

(as

indica

ted

above).

IF:

The;

test

does

not

work

at

all,

the

34-pin

cable

is

probably

reversed.

THEN:

Check

your

cable

and

start

the

test

again.

CONCLUSION:

Now,

that

the

hard

disk

drive

has

been form,atted

and

error

mapped,

you

need

to

refer

to

your

operating

system

manual

to

prepare

a

system

diskette

that

will

recognize

the

hard

disk.

Each

operating

system

prepares

its

diskettes

differently,

so use

your

instructions

for

each

operating

system

you

have.

8

DISK

3

TECHNICAL

INFORMATION

INTRODUCTION

The

CompuPro

DISK

3 is

an

intelligent,

.

high

performance

Winchester

disk

controller.

It

will

accept

up

to

four

soft-sectored

hard

disks

(Sea

gate

506

interface

or

equivalent),

providing

controller

and

DMA

interface

functions

to

the

IEEE

696/S-100

bus. All

real

time

disk

interactions

are

handled

by

the

on

board

processor,

elimina

ting

the

need

for

real

time

code

in

the

host

system.

The

only

real

time

requirement

of

the

host

is

the

ability

to

handle

the

DMA

transfer

rate.

HARDWARE

INTERFACE

The·

DISK

3

host

interface

consists

of

a

single

write-only

port

called

an

"a

tten

tion"

port.

You

can

choose

the

address

of

the

port

by

changing

positions

1-7 on

Switch

1.

The

port

appears

as a

pair

of

I/O

addresses.

CompuPro's

software

expects

to see

the

Disk

3

set

at

I/O

port

90 hex. Set

Switch

1

for

the

standard

I/O

port

locations

of

90

and

91

hex:

Turn

all

Switch

1

positions

ON,

except

for

positions

1

and·

4,

which

should

be

OFF.

(If

you

followed

the

instructions

for

How

To

Get

Your

DISK

3

Up

and

Running

Without

Reading

the

Manual,

you've

already

done

this.)

To

hold

the

local

8085

processor

in

a

reset

state:

write

a 01h.

This

will

reset

the

first

controller

set

at

I/O

port

90h.

An

FFh

will

reset

all

controller

boards

set

at

this

I/O

port.

An

attention

signal

may

be

sent

to

the

DISK

3

by

writing

OOh

to

the

attention

port.

Up

to

eight

DISK

3

or

equivalent

controllers

may

share

the

atten-

tion

port

address.

Each

of

the

eight

data

bits

written

to

the

port

resets

one

controller.

The

first

controller

should

be

jumpered

so

that

it

is

reset

by

data

bit

zero,

the

second

by

bit

one, etc.

Jumper

J10 is

used

to

select

the

appropriate

bit

for

each

board.

The

data

bits

DO-D7

correspond

to

jumper

positions

0-7

which

are

between

U46

and

U47

top

to

bottom.

Use

position

0

for

the

first

board,

position

1

for

the

second

board,

etc.

Thus,

with

only

one

board

at

position

0,

output

a

byte

with

data

bit

0, 0 to

sent

the

attention

signal

to

the

DISK

3.

The

DISK

3

may

be

directed

to

generate

an

interrupt

on

completion

of

a

command.

The

interrupt

line

to be

used

is

selected

by

the

installation

of

jumper

J9

positions

0-7,

and

INT.

These

correspond

to

Vectored

Interrupt

lines

VIO-VI7

and

the

bus

INT

signal

line.

Use

the

VII

jumper

(position

1

of

J9)

for

operation

in

a

CompuPro

multi-user

system.

9

All

other

communications

between

the

DISK

3

and

host

system

are

handled

via

DMA.

The

priority

with

which

the

board

will

arbitrate

for

the

bus

to

perform

its

DMA

cycles

is

selected

by

Switch

2

positions

1-4.

The

DISK

3 is

set

to a

priority

of

9

which

is

selected

by

turning

positions

2

and

3

ON

and

all

others

OFF.

On

the

present

units,

the

firmware

is

contained

in

a 2732

or

equivalent

EPROM..

The

board

is

socketed

for

accepting

either

a

2716, 2764,

or

27128.

Jumpers

J7

and

J8

must

be

set

according

to

the

size

of

EPROM

used.

J7

J8

2716

B-C

SOFTWARE

OVERVIEW

2732

B-C

A-C

2764

B-C

A-C

27128

A-C

Since

the

DISK

3 is

an

intelligent

controller

there

is a

sequence

which

is

performed

upon

receiving

an

attention

pulse

from

the

bus

master.

This

process

is

executed

for

each

attention

pulse.

The

bus

master

should

verify

that

the

DISK

3 is

not

busy

performing

the

when

a

new

operation

is

desired.

The

sequence

is as

follows:

1)

The

DISK

3

will

fetch

the

last

three

bytes

from

the

(which

starts

at

50

hex

after

an

initial

reset).

2)

The

DISK

3

fetches

13

bytes

from

the

current

IOPB

which

was

spe~ified

in

the

three

bytes

read

in

step

.1.

3)

The

DISK

3

will

interpret

the

command

and

perform

the

task

or

terminate

in

an

error

state

if

there

is some

problem.

4)

The

DISK

3

will

write

the

STATUS

byte

in

the

IOPB

to

let

the

bus

master

know

the

status

of

the

last

operation,

and

an

interrupt

will

l'e

generated

if

it

was

requested.

SOFTWARE

INTERFACE

The

DISK

3

and

host

system

communicate

with.one

another

through

a

main

memory

resident

structure

called

Input

Output

Parameter

Blocks

(IOPBs). When

the

host

system

wishes

to

have

a

disk

operation

performed

by

the

DISK

3,

it

assembles

the

command

and any

required

arguments

into

an

IOPB

and

signals

the

DISK

3

by

writing

the

attention

port.

The

DISK

3

will

copy

the

IOPB to its

internal

RAM

and

interpret

the

command.

Any

required

data

transfers

will

be

made

'automatically

to

the

address

indicated

in

the

IOPB. When

it

has

finished

the

command,

the

DISK

3

inserts

the

resulting

status

in

the

IOPB

and

optionally

generates

an

interrupt.

10

The

IOPB

is a

16

byte

data

structure

which

may

begin

anywhere

in

the

16

megabyte

address

space

of

the

IEEE

696/S-100

bus.

It

consists

of

the

following

byte

fields:

BYTE

NAME

FUNCTION

o

COMMAND

STATUS

2

DRIVE

3

ARGI

4

ARG2

5

ARG3

6

ARG4

7

ARG5

8

ARG6

9

ARG7

The

command

to

be

executed.

Initialized

by

the

host

to

zero

to

indicate

busy.

The

DISK

3

will

insert

the

resulting

status

when

the

command

has

been

completed.

Command

is

executed

on

this

logical

drive.

The

contents

of

the

arguments

field

are

command

dependent.

10-12

DATA

ThIs

field

contains

the

DMA

address

for

any

required

data

transfers.

13-15

LINK

This

field

contain

the

starting

address

of

the

be

interpreted.

COMMAND

-

This

byte

contains

a

valid

command

in

the

range

of

0

to

3F

hex,

along

with

an

interrupt

flag

in

the

most

significant

bit

position.

A

range

check

will

be

performed

on

the

operation

code,

and

if

an

in

valid

operation

code

is

detected,

the

command

is

terminated

with

an

argument

range

error.

The

most

significant

bit

of

the

command

byte

is a

flag

which

is

used

to

indicate

if

an

interrupt

is to

be

generated

on

completion·

of

the

command.

Each

of

the

operation

codes

are

described

below

in

the

OPERATION

CODE

section

along

with

their

required

arguments.

ST

ATUS

-

The

status

byte

provides

a

handshake

between

the

host

system

and

the

DISK

3 as

well

as

returning

the

resulting

status

of

an

operation.

This

byte

is

set

to

zero

by

the

host

before

an

attention

signal

is issued.

In

non

interrupt

driven

systems,

the

status

byte

may

be

polled

by

the

host

system,

the

zero

indicating

"busy"

until

the

actual

completion

status

is

provided.

A

status

of

FF

hex

indicates

successful

completion

of

the

command.

Other

possible

results

are

operation

code

dependent

and

are

listed

on

the

II

STATUS

CODE*

o

I

2

3

4

5

6

7

8

FF

DESCRIPTION·

Busy

-

DISK

3

has

not

completed

current

command.

Argument

range

error

-

something

is

wrong

in

the

IOPB.

Drive

not

ready.

Timeout

(header

not

found).

Data

CRe

error.

Write

fault.

Overrun

on

bus.

Header

CRC

error.

Map

full.

Completed

with

no

errors.

*These

status

codes

may

also

appear

as

error

message

numbers.

DRIVE

-

This

is

the

physical

drive

number

of

the

drives

as

con-

nected

to

the

DISK

3

board.

The

first

drive

is

drive

0

and

the

last

drive

on

the

first

DISK

3

board

will

be

drive

3.

If

there

are

more

than

one

DISK

3

boards

in

your

system

they

would

be

numbered

sequentially.

A

range

check

will

be

performed

on

the

contents

of

the

DRIVE

byte,

and

if

the

selected

drive

is

not

within

the

range

specified

for

the

DISK

3

board,

an

argument

range

error

is

indica

ted

and

the

command

is

terminated.

Other-

wise,

the

indicated

drive

is

selected

for

the

current

command

and

the

command

is-

execu

ted.

ARGI-ARG7

-

These

bytes

contain

command--specific

information

described

in

the

OPERATION

CODE

section

of

the

manual.

Commands

which

interact

with

the

drives

(seek,

read,

or

write)

will

first

test

DRIVE

READY

and

may

terminate

with

a

NOT

READY

status.

DATA

-

This

three

byte

field

contains

the

starting

address

for

the

DISK

3

data

transfer.

It

is

used

for

both

reading

information

from

the

disk

and

writing

information

to

the

disk.

LINK

-When

the

DISK

3

receives

an

attention,

it

clears

any

inter-

rupt

that

it

may

be

asserting

and

then

fetches

the

three

byte

LINK

field

of

the

last

IOPB

executed.

It

then

proceeds

to

the

address

indicated

by

the

LINK

and

fetches

the

first

thirteen

bytes

of

the

new

IOPB.

For

many

applications,

the

interface

to

the

DISK

3

will

use a

single

IOPB

after

leaving

the

original

LINK

address

at

50 hex.

If

using

a

single

IOPB,

the

LINK

field

is

simply

pointed

to

the

start

of

the

IOPB

and

not

altered

from

one

command

to

the

next.

12

OPERATION

CODES -

The

following

operation

codes

are

available

in

part

#223B

EPROM.

Note

that

the

code

numbers

are

specified

in

Hex.

CODE

FUNCTION

DESCRIPTION

00

NOOP

May

be used to

LINK

to a

new

IOPB

or

to

clear

an

interrupt.

01

VERSION

This

command

will

return

the

current

version

of

the

internal

firmware

in

the

EPROM

on

the

DISK

3

board

in

ARG

1 as a

hex

number.

02

GLOBAL

ARGI-ARG7

contain

global

information

which

is

true

for

all

drives

connected

to

the

DISK

3.

This

inf

orma

tion

is:

ARG

1 - Mode

of

operation.

If

Mode is OFFH

then

a 32

bit

field

specifying

an

absolute

sector

number

to

be

read

or

written

will

be

used

for

the

read/write

command.

If

Mode is

Zero

then

two

16

bit

fields

containing

logical

sector

and

logical

track

are

used

for

the

read/-

write

command.

ARG2

-

Number

of

retries

which

should

be

performed

before

returning

an

error

status

to

the

system.

ARG3

-

Number

of

drives

connected

to

all

the

DISK

3

boards

in

the

system.

03

SPECIFY

A

table

of,

parameters

for

the

selected

drive

will

be

loaded

fronl

the

main

Inenlory

address

indicated

by

DATA.

See "SPECIFY"

FORMAT

on

the

following

pages

for

the

format

of

this

table.

04

SET-MAP

Used

to

read

a

bad

sector

map

into

the

internal

RAM

of

the

DISK

3

board.

Data

field

contains

the

address

of

the

relocation

map

which

is 256

bytes

long. See

the

Appen-

dix

for

the

structure

of

the

relocation

map.

05

HOME

Drive

byte

contains

the

drive

number

to be

"homed" to

track

zero

at

a low

step

rate.

06

SEEK

Drive

byte

contains

the

drive

number

which

will

be selected.

Then

the

selected

drive

will

move

the

R/W

head

to

the

cylinder

specified

by

arguments

1 &

2.

07

READ-HEADER

The

hardware

will

attelnpt

to

read

any

header

from

the

presently

selected

track.

If

an

error

is

detected

in

the

mark

or

CRC,

the

opera

tion

will

be

repeated.

If

a

valid

header

is

found,

the

four

physical

address

bytes

will

be

transferred

to

DATA.

If

a

valid

header

cannot

be

found,

the

command

will

timeout.

13

08

R/W

This

command

is

used

for

all

sector

reading

and

writing.

It

is a

block

transfer

command

capable

of

transferring

from

1 to

64K

sectors.

The

Drive

byte

contains

the

drive

number.

Argument

1

contains

a

read/write

flag

where

one

indicates

a

disk

read,

zero

indicates

a

disk

write.

Arguments

2-5 con-

tain

either

a 32

bit

absolute

sector

number

or

two

16

bit

fields,

the

first

of

which

is

a

sector

number

whose

value

ranges

from

zero

to

the

number

of

sectors

per

track

minus

one.

The

second

16

bit

field

is

the

logical

track

number,

which

is

the

cylinder

number

times

the

number

of

heads

per

cylinder

plus

the

head

number.

Arguments

2-5

are

depen-

dent

on

the

Mode

byte

as

explained

above

in

the

GLOBAL

command.

Both

cylinders

and

heads

are

numbered

from

zero.

Arguments

6 &

7

contain

the

number

of

sectors

to be

tran-

sferred,

which

must

be

at

least

1.

If

the

command

completes

without

error,

the

track

and

sector

arguments

will

be

left

pointing

to

the

last

sector

transferred

pIus one,

the

count

will

be zero

and

the

DATA

address

will

be

pointing

to

the

last

byte

transferred

plus

one.

If

a

hard

error

occurs,

the

argu-

ments

in

the

IOPB

will

be

left

so

that

the

command

may

be

retried

by

simply

clearing

the

status

and

sending

an

a

tten

tion.

The

track

and

sector

will

point

to

the

sector

in

which

the

error

occurred.

The

count

will

indicate

the

number

of

sectors

yet

to be

transferred

and

the

DATA

address

will

indi-

cate

the

to be used.

09

RELOCATE

Used

for

relocating

bad

sectors

found

during

use

of

the

drive.

This

command

is

normally

used

during

block

R/W

commands.

If

a

hard

error

occurs

during

R/W,

the

STATUS

byte

is

cleared,

the

command

byte

is

replaced

with

RELOCA

TE,

and

a

tten

tion

is

genera

ted.

The

track

entry

is

placed

into

the

internal

relocation

map

and

the

drive

copy

of

the

map

is

updated.

Any

data

buffers

that

should

have

been

written

to

the

bad

track

are

writ-

ten

to

the

new

track,

and

any

data

already

on

the

bad

track

is

moved

to

the

new

track.

Then

the

original

contents

of

the

data

buf-

fer

are

restored.

After

RELOCATE,

the

status

byte

and

command

bytes

can

be

replaced

with

the

R/W

command

and

execution

continued

if

further

transfers

are

to be

performed.

14

OA

FORMAT

This

command

will

format

one

track.

Before

it

can

be

issued,

the

heads

must

be

placed

on

the

appropriate

cylinder

using

the

SEEK

command

and

the

appropriate

head

must

be

selected

with

the

SELECT

command.

Argument

1

must

contain

the

length

of

GAP

3

and

argument

2

must

contain

the

fill

character

to

be

used

in

the

data

field.

ARG3

must

contain

the

head

number

to

format.

OB

FORMAT-BAD

This

command

will

mark

the

track

given

in

Arguments

2-5 as BAD.

Usually

used

in

a

forma

t

program.

OC

ST

ATUS

The

physical

drive

status

port

on

the

DISK

3

is

read

and

it

is

written

in

ARG

1

of

the

IOPB.

OD

SELECT

The

contents

of

ARGI

are

transferred

to

the

DISK

3

physical

drive

control

ports.

OE

EXAMINE

The

local

memory

of

the

DISK

3

addressed

by

arguments

1 & 2

will

be

dumped

to

external

RAM

as

addressed

by

DATA

for

a

count

as

indicated

in

arguments

3 & 4.

OF

MODIFY

A

block

of

data

will

be

transferred

from

main

memory

starting

at

the

address

indi-

cated

by

DATA

to

the

memory

address

within

the

DISK

3

indicated

by

arguments

2 & 3

for

a

count

as

indicated

by

arguments

4 &

5.

All

two

byte

arguments

are

stored

low

byte

first.

INITIALIZATION

-

To

initialize

the

DISK

3, a

software

reset

should

be

performed

by

pulsing

the

appropriate

reset

bit

in

the

atten-

tion

port.

An

initial

IOPB

must

be

constructed

at

50h

where

all

but

the

LINK

field

bytes

are

don't

care.

The

LINK

field

must

point

to

the

first

actual

IOPB.

Following

a

reset,

the

head

must

be

positioned

over

cylinder

0

by

the

HOME

command

before

the

drive

can

be accessed.

If

the

drive

has

not

been

previously

formatted

a

SPECIFY

command

must

be

issued

to

complete

the

initialization.

If

the

drive

has

not

been

previously

formatted,

a

SPECIFY

command

must

be

issued

and

the

drive

must

be

given

a

bad

sector

map.

Cylinder

0,

head

0,

sectors

0

and

1

must

be

read

into

memory

at

the

same

time.

Sector

0

begins

with

the

string

"CompuPro",

which

can

be

used

to

insure

that

the

drive

has

been

formatted

with

a

CompuPro

DISK3

format

program.

16

bytes

into

sector

0 is

the

specify

block

for

this

drive.

This

specify

block

should

be

sent

to

the

controller

with

the

SPECIFY

.

command.

The

first

256

bytes

of

Sector

1

contain

the

bad

sector

relocation

map

for

this

drive.

The

relocation

map

15

CompuPro DISK 3 User manual

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