IBM 3803 Manual de usuario

GA32-0021 -1

Systems

Preface

This manual provides reference information about the IBM 3803 Model 2 Tape

Control and 3420 Models 3 - 8 Tape Units.

This manual requires no prerequisite reading; however, it

assumed the reader

has a basic knowledge of stored program computers.

Second Edition (March

197

This

major

revision of, and obsoletes GA32-0021-0. Changes are periodically made to the

information herein; any such changes will be reported in subsequent revisions

Technical

Newsletters.

All specifications in this manual are nominal unless otherwise indicated.

Requests for copies of IBM publications should be made to your IBM representative

to your

local IBM Branch Office.

This manual has been prepared by the IBM General Products Division, Maintainability and

Testing,

Department

26T, P.

Box 1900, Boulder, Colorado, 80302. A

form

provided at

the back of this publication for

the

reader's comments.

the form has been removed,

comments may be sent

the above address.

Contents

Section 1: Introduction 9

Basic Subsystem . . . 9

3420 Tape Unit . . . 9

Automatic Threading 9

IBM

Easy Load Cartridge 9

Tape Transport . . . 10

Read Back Checking 10

Full-width Erasure 10

File Protection . . . 10

Rewinding . . . . . 10

3420 Models 4, 6, and 8 10

Recording Methods

6250 BPI . . . . . . .

1600 BPI . . . . . . .

800 BPI, Nine-Track NRZI

Seven-Track . . . . .

Interblock Gaps . . . . .

Magnetic Tape and Reels . .

3803 Model 2 Tape Control

General Characteristics

Addressing . . . . . .

Metering . . . . . . .

Enable/Disable Switch .

Power

On/

Off Sequencing

3803 Model 2 Features

Nine-Track NRZI . .

Seven-Track . . . .

Two-Channel Switch

Device Switch

2 Control Switch 17

3 Control Switch 17

4 Control Switch

Section 2: Commands and Instructions

Commands . . .

Burst Commands

Write . . . .

Read Forward

Read Backward

Sense . . . .

Sense Reserve

Sense Release 24

Request Track-In-Error (Request

TIE)

Loop Write-To-Read (LWR) 24

Set Diagnose . . . . . . 24

Motion Control Commands . 24

Rewind (REW) . . . .

Rewind/Unload

(RUN)

Erase Gap (ERG) . . .

Write Tape Mark (WTM) .

Backspace Block (BSB)

Backspace File (BSF) 26

Contents 3

Forward Space Block (FSB) 26

Forward Space File (FSF) 26

Data Security Erase

(DSE)

. 26

Non-Motion Control Commands 27

No-Operation

(NOP)

Mode Set 1 (MS 1) . . . . 27

Mode Set 2 (MS 2) . . . . 27

Diagnostic Mode Set

(DMS)

1/0

Instructions 28

Test

1/0

. . . . . . . . . 28

Halt

1/0

. . . . . . . . . 28

Section 3: Subsystem Operator Functions 29

Inserting Tape Reel in Cartridge 29

Load Procedure . . . . . . . . . 29

Unload Procedure . . . . . . . .

Operating Procedures

After

Failure 30

Tape Fails to Thread (With Cartridge) .

Tape Fails to Thread (Without Cartridge)

End

of Tape Comes Off Machine Reel

Hub

as Tape Loads in Columns . . . . . . .

Tape Unit Fails to Sense

EOT

Marker (Tape

End

Comes Off Reel) 30

Tape Threads Successfully But Fails to Load in Columns 31

Window Fails to

Open

After Unload Operation . . . . 31

Channel Fails to Select Tape Unit (Device Switching

Two-Channel Switch Feature Installed) 31

3420 Indicators and Pushbuttons 32

3803 Operator's Panel . . . 33

Toggle Switches . . . . . 33

Enable/Disable Switch(es)

Power

On/Off

Procedures 34

Power Off . . . . . . .

Power

. . . . . . . 35

Section 4: Status and Sense Information 37

Status Byte . . . . . . . . . 37

Sense Bytes . . . . . . . . . 39

Sense Byte 0 (Unit Check) . 39

Sense Byte 1 . . . . . . .

Sense Byte 2 (Track

Error) 41

Sense Byte 3 (Data and Equipment Checks)

Sense Byte 4 . . . . . . 43

Sense Byte 5 . . . . . . . . . . . . . . 43

Sense Byte 6 (Tape Unit) . . . . . . . . 44

Sense Byte 7 (Tape Unit Ready-Drop Source) 44

Sense Byte 8 (Microprogram Detected Errors) 45

Sense Byte 9 . . . . . . . . . . . . 45

Sense Byte 10 . . . . . . . . . . . 46

Sense Byte

(MAL

ROS/MP

Errors) 46

Sense Byte 12 (MAL 2

ROS/MP

Errors) 47

Sense Byte 13 . . . . . . . . . . . 47

Sense Byte 13, Bits 2-7 and

Sense Byte 14 (Tape Control Identification) 47

Sense Byte

and 16 (Tape Unit Identification -Serial Number) 47

Sense Byte 17 (Tape Control Features) 48

Sense Byte 18 48

Sense Byte 19 48

Sense Byte 20 48

4 3803-2/3420 Subsystem Description .

Sense Byte

(Thread and Load Diagnostics) . . .

Sense Byte 22 (Field Replaceable Unit Identification)

Sense Byte

(Field Replaceable Unit Identification)

Section 5: Error Recovery Procedures

Tape Cleaner Sequence

Operator Messages . . . . . . .

Action Requirements . . . . . . . .

Terminal Action

(With Operator Option)

Terminal Action

(Without Operator Option)

Action II (Unit Check) . . . . .

Action III (Intervention Required) . . . . .

Action IV (Bus Out Check) . . . . .

Action V (Data Check

Read or Read Backward)

Action VI (Data Check

Write and Write Tape Mark)

Action VII (Overrun, Channel Data Check Chaining Check)

Action VIII (Data Check on Control) . . . . . . . . .

Action IX (Not Capable) . . . . . . . . . . . . . .

Action X (Equipment Check, No Previous Sense Bits On)

Action XI (Data Security Erase) . . . .

Action XII (Load /Point, Program Check,

Protection Check, Incorrect Length) . .

Action XIII (Command Reject, Data Converter Check)

Action XIV (ID Burst Check on Write and Write Tape Mark)

Supplementary Information

Index

Contents 5

Figures

Figure

Subsystem Characteristics . . . . . .

Figure 2. 3803 Model 2 and 3420 Configurations

Figure 3. Density Feature Combinations

Figure 4. Two-Channel Switch . . . . . . . .

Figure

Switching Configurations (Part 1 of 2)

Figure 5. Switching Configurations (Part 2 of 2)

Figure 6.

3803-2/3420

Commands . . . .

Figure 7. Inserting Tape Reel

Cartridge

Figure 8.

Load

Procedure . .

.....

Figure 9. 3420 Indicators and Pushbuttons

Figure 10. 3803 Operator's Panel

.....

6 3803-2/3420 Subsystem Description

22.

Abbreviations

BCD

binary coded decimal

LWR

loop write to read

BOT

beginning of tape meter

BPI

bytes per inch millimeter

BSB

backspace block millisecond

BSF

backspace

file

1 Mode Set 1

ccw

channel command word

2 Mode Set 2

cust9mer engineer

MTE

multi-track error

ChE channel end

NOP

no operation

centimeter

NRZI

non-return to zero,

IBM

CPU

central processing unit

csw channel status word

operating system

CUE

control unit end

phase encoded

DMS

diagnostic mode set rewind

DSE

data security erase

REW

ROS

read-only storage

EBCDIC

extended binary coded

RUN

rewind/unload

decimal interchange code R/W read/write

EOT

end of tape secondsec

ERG

erase gap

SIO

start

0 instruction

FRU

field replaceable unit

switch

FSB

forward space block Two-Channel Switch

FSF

forward space file

TCS

tape indicate

hex hexadecimal TIE track in error

IBG

interblock gap

tape mark

identification

unit exception

interface usec microsecond

1/0

input/

output

YRC

vertical redundancy check

ips inches per second

Kb kilobyte

WTM

write tape mark

Kd kilodigit

Abbreviations 7

Section

Introduction

Basic

Subsystem

3420

Tape

Unit

Automatic

Threading

The IBM

3803-2/3420

Magnetic Tape Subsystem consists of an IBM 3803 Model

2 Tape Control and one or more IBM 3420 Magnetic Tape Units. The 3420

Tape Units are available in six models with tape speeds

75, 125, and 200

inches per second

(190,5/317,5/508

cm/sec)

for Models

3/4,

5/6,

and

7/8,

respectively.

The 3803 Model 2 operates at 6250 BPI and 1600 BPI densities.

~803

Tape Control without any switching features controls up to eight 3420

Tape Units

x 8 configuration).

The 3803 command set, status responses, and basic sense data are compatible

with 2400-series tape subsystems. However, there are some minor programming

differences.

For

example:

The number of sense bytes and contents

those bytes differs from those

used by 2400-series subsystems.

All commands not listed in Figure 6 except Mode Set type set

COMMAND

REJECT (sense byte 0, bit 0).

3. A sense command must be issued after a condition

encountered which sets

UNIT CHECK in the unit status byte.

In most instances, non-time dependent programs that operate successfully on

2400-series tape units will operate correctly on a

3803/3420

subsystem with the

appropriate features.

Information presented in this section applies to all models of the tape unit.

When the operator places a file reel or a cartridge

the reel hub and presses

LOAD-REWIND,

the power window closes, the automatic reel latch secures the

file reel to the hub, and tape

threaded, loaded into the columns, and positioned

at load point without further operator action.

IBM

Easy

Load

Cartridge

When used with a solid-flange tape reel (standard IBM 10.5 inch), the IBM Easy

Load Cartridge reduces tape handling and helps prevent contamination

physical damage.

During a load operation,

the first threading sequence

unsuccessful, tape

rewound into the cartridge and another attempt

made.

Section

Introduction 9

Tape

Transport

Read

Back

Checking

Full-Width

Erasure

File

Protection

Rewinding

3420

Models

and

A single, direct-drive capstan moves tape forward

backward. Air bearings

reduce friction and tape wear since the oxide (recording) tape surface contacts

only the

read/

write head, the erase head, and the tape cleaner. Short, tapered

vacuum columns greatly reduce tape inertia when starting and stopping tape. The

tapered columns and single-drive capstan start and stop tape quickly and

smoothly.

A two-gap

read/

write head allows read back checking during a write operation.

Moving forward tape passes first the write gap, then the read gap.

An erase head applies a strong magnetic field that erases the entire width

tape

during write operations. Full-width erasure prevents interchangeability problems

when tape

written on one tape unit and read

another; it also reduces the

chances of leaving extraneous bits in interblock gaps or skip areas.

During a write, write tape mark, or erase operation, the tape unit monitors the

erase head operation. On a 3420 Model 4, 6, or 8 an erase head failure drops

tape unit ready status and halts tape motion.

a 3420 Model 3, 5, or 7 an

erase head failure sets

UNIT

CHECK, but does not drop ready status.

A write enable ring must be present in the

file

reel when writing. To avoid

destroying information on tape, remove the write enable ring. A reel without the

ring

"file-protected." The FILE PROTECT indicator remains on when a reel

without a file protect ring

mounted and no writing can occur.

Tape remains in the vacuum columns during rewind operations. Rewind ends

when a photocell senses a beginning-of-tape (load point) reflective marker on

tape.

During a rewind/unload operation, tape

rewound completely onto the file reel.

The tape unit

left in unloaded status, with the tape reel latch unlocked and the

window open, allowing the operator to remove the file reel.

The 3420 Models 4, 6, and 8 have the following added capabilities and features:

• 6250 BPI capability.

• 0.3-inch IBG.

Nominal data rates of 1250, 780, or 470

Kb/sec

at 6250 BPI.

• Improved access times.

• Prec:1e motion control

the media to achieve faster data access times.

6250 BPI or

6250/1600

BPI density features.

• Automatic read amplification.

New tape cleaning mechanism.

3420 Models 3, 5, and 7 can be converted to 3420 Models 4, 6,

and

10 3803-2/3420 Subsystem Description

Este manual sirve para los siguientes modelos

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