A2091 - Schematics.pdf - A2091 - Schematics - julpiech

SYSTEM SCHEMATICS

A2091

DECEMBER, 1989

PN-314674-01

INTERNATIONAL EDITION

COMMODORE "INTERNATIONAL EDITION" SERVICE MANUALS CON

TAINPARTNUMBERINFORMATIONWHICHMAYVARYACCORDINGTO

COUNTRY. SOME PARTS MAY NOT BE AVAILABLE INALL COUNTRIES.

Commodore Business Machines, Inc.

1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A.

Commodore makes no expressed or implied war

ranties with regard to the information contained

herein. The information is made available solely on

an as is basis, and the entire risk as to quality and

accuracy is with the user. Commodore shall not be

liable for any consequential or incidental damages

in connection with the use of the information con

tained herein. The listing of any available replace

ment part herein does not constitute in any case

a recommendation, warranty or guaranty as to

quality or suitability of such replacement part.

Reproduction or use without expressed permission,

of editorial or pictorial content, in any matter is

prohibited.

This manual contains copyrighted and proprietary information. No part

of this publication may be reproduced, stored in a retrieval system, or

transmitted in any form or by any means, electronic, mechanical,

photocopying, recording or otherwise, without the prior written permis

sion of Commodore Electronics Limited.

A2091 SYSTEM SCHEMATICS

TABLE OF CONTENTS

• SPECIFICATIONS

PARTS LISTS

SCHEMATICS

NOTE

PLEASE REFERENCE A2091 USER MANUAL

PN-363227-02 FOR DETAILED OPERATIONS.

A2091 SYSTEM SCHEMATICS

A2091-40 SPECIFICATIONS

DESCRIPTION

This specification describes the Functional Requirements for an A2091-40 hard disk upgrade kit.

CONTENTS

The A2091-40 hard disk upgrade kit contains the following items:

A. A2091 Hard disk controller board

E. Shock mounts for hard drive

B. Cables for card-mounting hard disk drive

F. Stiffening rod for A2000

C. Quantum pro-drive 40S hard disk drive

G. Foam pad for A2000

D. Cable for mounting hard drive in drive bay

H. A2000HD sticker for front panel of A2000

An A2091-40 upgrades an A2000 to an A2000HD.

PARAMETERS

Dimensions:

PCB 13.25 inches; Hard drive 6 inches by 4.25 inches by 2 inches

Weight:

5 lbs.

Power requirements:

PCB:

+12V 0.0A, +5V 1.0A

Hard drive:

+ 12V 1.6A, +5V 0.7A Power up; + 12V 0.8A, +5V 0.6A Normal operation

Hard drive features:

42 MB formatted capacity; 19 ms seek time; supports disconnect/reselect; 64K byte look-

ahead cache; 1:1 interleave

A2091 SPECIFICATIONS

DESCRIPTION

This specification describes the Functional Requirements for an A2091 hard disk controller assembly.

PARAMETERS

Dimensions:

PCB 13.25 inches by 5 inches

Weight:

1 1b.

Power Requirements:

Without a hard drive mounted to card:

+ 12V 0.0 A

+ 5V 1.0 A

With hard drive mounted to card:

+ 12V 2.5 A max startup, 0.9 A max continuous

+ 5V 2.5 A continuous

Features:

Hard disk controller for SCSI or XT style drives; Sockets for up to 2 MByte fast RAM;

Auto-boot ROMs; Boots directly into Fast File System; Rear socket permits connection

of Macintosh style SCSI expansion devices; Space on card to mount user's own 3.5" hard

drive

A20P1 SYSTEM SCHEMATICS

JUMPERS

JP1 is used to set the amount of memory on the board. It has 4 positions that represent no memory, 512K, 1M and

2M of memory.

JP2 is used to enable and disable the auto-boot ROMs. The ROMs must be disabled when the board is installed in

an A2000 with KS1.2 ROMs. The position marked "AUTO" enables the auto-boot ROMs and the position marked

"DIS" disables the autoboot ROMs.

JP3 determines the interrupt level that the board generates and is not user adjustable. It is factory wired to INT2.

JP5 is a software readable set of 3 jumpers. The function depends on the driver software, but with V4.4 ofthe driver

the function is as follows:

Jumper 1: Enable Multiple LUNs

Jumper 2: Enable long boot timeout, disable parity check

Jumper 4: Undefined

JP201 determines the clock rate fed into the WD33C93 SCSI controller IC. It is factory wired for a 7 MHz clock

rate and is not user adjustable. If an end user would like to replace the standard WD33C93 with a high speed version

of the part, the trace between the upper 2 pins of JP201 can be cut, and the lower 2 pins wired together. This would

result in a 14 MHz clock rate which would effectively double SCSI throughput given a hard drive that can operate

at that speed.

Factory settings are as follows:

JP1

OK (no memory)

JP2

DIS (Autoboot disabled)

JP3

INT2

JP5

ALL 3 functions disabled

JP201

7 MHz

CONNECTORS

CN1 (Not labeled on board) 100 pin Amiga edge card connector

Designed to plug into a standard A2000 100 pin Amiga slot.

CN2 XT LED

This is designed to accept the plug from the hard disk LED on the front panel of the A2000 if the user is using an

XT drive. This connector will light the front panel LED whenever the XT drive is accessed.

CN3 SCSI LED

This is designed to accept the plug from the hard disk LED on the front panel of the A2000 if the user is using a

SCSI drive. This connector will light the front panel LED whenever any SCSI device is accessed.

CN4 XT drive connector

This 40 pin connector is designed to attach to a ribbon cable that connects to an XT hard drive.

CN5 External SCSI connector

This DB25 connector is designed to connect the A2091 to external SCSI devices. It uses a pinout identical to the Apple

Macintosh (R) SCSI connector and has the capability of connecting to any peripheral that is designed to connect to

the Macintosh (R). Up to 7 external devices may be connected by daisy-chaining.

CN6 Internal SCSI connector

This 50 pin header is designed to attach to 1 or more (up to 7) internal SCSI devices. Multiple devices are connected

by crimping multiple connectors onto 1 ribbon cable.

CN7 Power connector

This 4 pin molex connector supplies power to a 3.5" hard drive that the user may install on the A2091. The maximum

power that may be drawn from this connector is as follows:

+ 12V: 2.5A max startup (8 sec), 0.9A max continuous; +5V: 1.5A max continuous

MOUNTING OF HARD DRIVE

Space is provided on the A2091 for the end user to mount a 3.5 inch hard drive. Mounting hardware is not included,

and a cable is required to allow the hard drive to draw its power from the A2091, CPN 312646-01.

A2091 - Schematics.pdf

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