IBM 3420 Manuel utilisateur

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IBM

3420/3803

Magnetic Tape Subsystem Reference Guide

'PREFACE

,.This

reference~guide

and associated video presentation were created by FE Service Plan-

'ning and Support to assist you in maintaining the 3420/3803 Magnetic Tape Subsystem.

Two approaches were taken:

L',

New information

included as a result

data indicating the areas where more

in-depth knowledge

needed.

2. Currentinformation, which

frequently used, has been condensed from the

MLM/

Pathfinder and included here.

The guide

divided'into four major sections. Each

these sections contains informa-

tion which logically fits into that section. Take the time to glance through the guide and

get an idea

what

included.

Pay particular attention

the "NTF Service Checks" portion

each area.

intended

give

you a list

actions

be performed which may help eliminate many call-back

situations.

When

you write a no trouble found

(major unit 960) try to

use

unit/cause

codes which best describe the reported failure symptom

that FE SP/S may have a

better understanding

areas

the machines with intermittent problems.

THIRD EDITION (January 1980)

This

a major revision of,

but

does not make S229-6019-1

obsolete.

Address any comments concerning the contents

thls publication to:

IBM

Field

Engineering Service Planning, Department 96C,

BUilding

005, Tucson, Arizona 85744.

1980

CONTENTS

GENERAL

3420 Subsystem Characteristics. . . . .

3803 Model 3 and 3803

Modell

Differences

Recording Philosophy . . . . . . . .

Understanding

EREP1.

. . . . . . .

Procedure for Scoping 3420 Tape Unit Sense Bits on Logic Board

3420/3803 Status/Sense Bytes

. . . .' . . .

3803-2/3420-3Tiuough 8 Tape Drive Sense Atialysis. .

3803/3420 Online Tests

What

Where in the

MLM?

Common

Abends.

. . .

Tools and Test Equipment

MEDIA

, IRD PEP Specialist

Magnetic

Tap~

CommOl1

Media Related Problems

3420 "

Read/Write Service Techniques

Read/Write Failure Analysis .

Read/Write Head Service Hints .

3420 Read/Write NTF

Ch~ck1ist

Tape Developing Procedure

Developed Tape Samples . . .

3420 RD/WR Data Flow . . .

,3420

Tape Motion Service Techniques. .

3420 Tape Motion NTF Checklist .

3420

Tape Motion . : . . .

3420 Power Service Techniques

342Q Power NTP Checklist

34:20

Power -

Voltages .

3420/625,0- Conversion-Tips .

Schedule, . .

3420 Sales Feature Codes, .

3420 (All Models) Status

Identifier.

3420 ECA Checklist

Models3, 5, 7 - AI'

BO'ard

Models 4, 6, 8 -

Board.

.Card

Jump~rs

-Models 3, 5, 7

Card Jumpers -Models

4,6,8

'Co1l1mon

3420 Part Numbers.

'FlafBelt

Pneuf!1atic

Supply

101

103

117

119

, 121

125

129

131

CONTENTS

(continued)

3803

Modell

Data Flow

3803 Model 2 Data Flow

3803 Microprocessor Instruction

Format.

3803 Microprocessor

Tips.

. . . . .

Current ALU Patches . . . . . . .

Current 3420/3803 Related Software Zaps

3803 Channel Interface . . . . .

3803

Voltages . . . . . . .

3803

Mod

1 to 2 - 6250 Conversion Tips

3803 Conversion Tips from Data Bank

3803 Preventive Maintenance Schedule

3803 Sales Feature

Codes.

. .

3803-1 Feature Identifier . . .

3803-1 Feature Installation Times .

3803-2 Feature Installation Times

3803

ECA

Checklist. .

Bibliography . . . .

Index . . . . .

Reader's Comment Form

139

141

143

145

149

153

155

163

165

169

173

175

177

179

. 183

185

197

199

" GENERAL

""-----

3420

SUBSYSTEM

CHARACTERISTICS

Model 3 Model 4 Model 5 Model 6 Model 7 Model 8

Tape

Speed

(Read

orWrite)

(ips) 75 75 125 125 200 200

(cm/sec) 190,5 190,5 317,5 317,5 508 508

6250

Read

Access

Time, nominal*(ms) 2.3 1.6

1.1

1600

Read

Access

Time, nominal*(ms) 4.0 4.0 2.9 2.6 2.0 1.65

6250 Write

Access

Time, nominal*(ms)

2.1

1.5 0.95

1600 Write

Access

Time, nominal*(ms) 4.0 3.0 2.9 2.0 2.0 1.28

Forward Start Time, nominal**(ms) 1.8 1.4 1.4

1.1

1.3 .08

Data

Rates

(Kb/sec;Kd/sec):

6250 bpi 470/940 780/1560 1250/2500

1600 bpi

120/240

1201240

200/400 200/400 320/640 320/640

800 bpi NRZI (9-Track) 60/120 100/200 160/320

800 bpi NRZI (7-Tra.ck) 60 100 160

556 bpi NRZI (7-Track) 41.7 69.5 111.2

200 bpi NRZI (7-Track) 15.0 25.0 40.0

Passing

Times per Byte (usec):

6250 bpi 2.133 1.28 0.80

1600 bpi

8.3 8.3 5.0 5.0

3.1

800 bpi NRZI 16.7 10.0 6.2

556 bpi NRZI 24.0 14.4 9.0

200 bpi NRZI 66.7 40.0 25.0

Passing

Times, IBG (ms):

6250 bpi 4.0 2.4 1.5

9-Track(PE

and

NRZI) 8.0 8.0 4.8 4.8 3.0 3.0

7-Track'(NRZI) 10.0 6.0 3.75

Rewin.~·

Time (2400-foot reel) 60 60 60 60 45 45

Rewind/Unload Time:

(2400-fQot reel)

(sec)

66 66 66

51 51

Load

Operation, approximate time (in

sec)

'tape

unit

ready' (after

'reel/cartridge

mounted and 10 10 10 10 7 7

LOAD/REWIND

pressed)

Read

access

time

the interval fr.om initiation

a Forward

Read

command given

the

t-ape

control

whe~

tape

not

at load point, until the first data byte

read

when tape

brought up

speed

from

stoppe€!

status.

,*Write

access

time

the interval

from

the

issuance

Move

command given

~he

tape

unit

when tape

not

at load point,

until

the first data byte

written on tape when tape

brought up

speed

from

stopped status.

**Start

time

the

int~rval

from

the

issuance

a Move command

the tape unit, until tape

attai~s

90%

specified velocity. .

3803

MODEL

AND

3803

MODEL

DIFFERENCES

The Model 3

was

designed

attach

370/115s and 125s.

basically a

Modell

with

three major differences. These differences are required because the 115 and 125

don't

use

a standard 370 channel.

-ALUI

modified

interface with the channel on the 115 and 125 and translate the

activity to 370 channel sequences which the rest

the 3803 understands.

-Hardware logic called AUTO DATA TRANSFER

provided

handle the data trans-

fer.

includes the byte counter.

- A 32-BYTE DATA BUFFER

provided for reading and writing. This large a buffet

required in the event

that

data crosses a page boundary. When this happens, time

required for ALUI to set the address

the new page back into the data address con-

trol in the 115 or 125.

The 3803 Model 3 tape subsystem connects to the Magnetic Tape Adaptor (MT

inter-

face

system 3115 or system 3125. The term

A interface refers

a set

lines over

which control and data signals are exchanged between the control unit and the

portion

the system.

The basic 3803-3 Control Unit consists

A interface attachment section, a data

buffer section, a microprogram section, a read section, a write section, a tape unit inter-

face and a

section.

I/O commands received from

CPU

through

MTA

are executed with microprograms resi-

dent in two independent read-only storage (ROS) units within the 3803-3 Control Unit.

One ROS controls the MTA interface lines while the other ROS controls the tape unit

interface.

The 3803-3 Control Unit operates in burst mode for all data transfers and executes com-

mands received across the interface, performing one command

a single tape unit at a

time.

When

a 3803 Mode13

taken offline, all functions from the control

the tape unit

become the same

Modell

3803.

RECORDING

PHILOSOPHY

Types

Codes:

NRZI

GCR

Non-Return

Zero Indicating

Phase Encoding

Group Coded Recording

The progression

IBM

digital recording from NRZI

PE to GRC

the result

IBM's

effort to provide the customer with the lowest cost and highest reliability tape storage

devices.

NRZI coding utilizes a chnage in flux

indicate a one and no change

represent a zero.

NRZI tapes can be written in densities

200, 556 bpi in 7-track format, and 800 bpi in

9-trace format. (See example A.)

PE coding utilizes a change

magnetic flux in the positive direction

indicate a one

and a change in the negative direction

indicate a zero. PE tapes are written

1600

bpi 9-track density only. (See example B.)

GCR coding utilizes a combination

NRZI and PE

achieve the highest density avail-

able on

IBM

drives. Density for GCR

effectively 6250 bpi. (See Example C.)

Group Coded Recording -

6250

bpi

Group Coded Recording (GCR) offers many advantages over previously used recording

methods. This recording offers higher reliability even with existing tape libraries.

Greatly expanded error correction capability has been engineered into GCR. Higher

data rates and lower access times

give

higher throughput and reduced channel time,

re-

sulting in higher system performance. Data

compacted on tape, reducing rewind

times, shortening the length

tape required for a data set, reducing the number

reels, reducing mounts and dismounts, and improving overall tape handling. Other

advantages exist,

but

here

wish

discuss only the recording technique.

The data

still recorded in blocks, or groups

characters. A block

data may be

a single character or byte, or a number

bytes

determined by the programming

system used. The significant improvements in the GCR mode are:

1. The information data

recorded at an effective density

6250 bytes per inch.

2. The separation between blocks (IBG)

0.3 inch, and,

3. That simultaneous errors in any two

the nine tracks are corrected automatically.

A GCR block consists

a preamble, data and a postamble. The preamble and post-

amble are each 80 bytes long and serve to synchronize the read detection circuits in a

manner similar

previous 1600 bpi subsystems. The data portion

the block consists

the following:

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