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Chapter 2

Theory

Operation

Introduction

This

chapter

contains the

9895A

theory

operation

and

block diagrams.

The

9895A

can

broken

down

into a controller

module,

a drive

module

and

power

supply.

The

controller

described

first,

then

the

drive, followed by

the

power

supply.

Controller Module Theory

Operation

Introduction

This section provides a functional description of

the

controller,

part

number

09895-66500.

General Description

The

controller

module

provides

interface

between

Hewlett-Packard

Interface

Bus

(HP-IB)

channel

and

four disc drives.

Commands

are

accepted

from

the

HP-IB

channel

and

interpreted

provide

the

proper

operating

sequences

for

the

selected

disc

drive. This includes:

• Providing control

and

timing signals,

•

Sending

data

the

disc drive,

• Receiving

data

from

the

disc drive,

•

Handling

all

input/

output

communication

with the drive

channel.

The

controller provides control signals to

the

drive

and

receives

the

resulting

status

informa-

tion.

error

occurs, or

when

a disc

removed

inserted

into a disc drive,

the

controller

requests

attention

from

the

HP-IB.

also

generates

and

decodes

error

detection

bits which

are

recorded

with the data.

addition to

these

normal

operations,

self-tests

are

performed

the

controller

and

the disc drives.

2-1

Brand	HP
Model	9845B/C CE
Category	Storage
Language	English

HP 9845B/C CE Service Manual

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