Commodore Amiga A500 Produkthandbuch

Technical Reference

Manual

Commodore

Commodore"Amiga"

AS00/AZ000

Technical Reference

Manual

This manualiscopyright

1986.

1987

byCommodore-Amiga.Inc.All RightsReserved. Thisdocument

may not. in whole or part. be copied, photocopied, reproduced, translated or transferred to any

electronic medium or machine readable form without prior consent, in writing, from Commodore-

Amiga. Inc.

Amiga is a registeredtrademark ofCommodore-Amiga. Inc.

Commodore and CBM are registered trademarks ofCommodore Electronics Limited.

Hayes isa registeredtrademark of Hayes Microcomputer Products. Inc.

IBMisa registeredtrademark of International BusinessMachinesCorporation.

Maclntosh isa trademark ofApple Computer. Inc.

DISCLAIMER

THE INFORMATIONIS PROVIDED"AS IS" WITHOUT WARRANTY OF ANY KIND. EITHER EXPRESSEDOR

IMPLIED. THE ENTIRE RISK AS

THE ACCURACY OF THE INFORMATION HEREIN IS ASSUMED BY

YOU. COMMODORE-AMIGA DOES NOT WARRANT. GUARANTEE. OR MAKE ANY REPRESENTATIONS

REGARDING THE USE OF, OR THE RESULTS OF THE USE OF, THE INFORMATION IN TERMS OF

CORRECTNESS. ACCURACY. RELIABILITY, CURRENTNESS. OR OTHERWISE. IN NO EVENT WILL

COMMODORE-AMIGA. INC. BE LIABLE FOR DIRECT. INDIRECT, INCIDENTAL OR CONSEQUENTIAL

DAMAGES RESULTING FROM ANY DEFECT INTHE INFORMATION EVEN IF IT

HAS

BEENADVISED OF

THE WSSlBlLlTY OF SUCH DAMAGES. SOME LAWSDO NOT ALLOW THE EXCLUSION OR LIMITATIONOF

IMPLIED WARRANTIES OR LIABILITIES FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. SO THE

ABOVE LIMITATIONOR EXCLUSION MAY NOT APPLY.

Schematicsrepresent current machinewhich is subjecttochange without notice.

Credits

The material for this manual was produced by Engineering, Documentation,

and Technical Support staff at Commodore West Chester. Commodore

Braunschweig, and Commodore-Amiga. Individuals contributing major por-

tions of information and input are Dave Haynie, Jeff Porter, Phil Lindsay,

Carolyn Scheppner, Lisa Siracusa, George Robbins, Andy Finkel, Eric Cotton,

Jeff Boyer. Steve Ahlbom, Steve Beats, Dieter Preiss, Bernd Assmann, and

Torsten Burgdorf.

This manual was compiled and edited by Steve Finkel.

Manual design by Jo-Ellen Temple and Wilson Harp.

AZOOO/AS00

Technical Reference Manual

Table

Contents

Section

Summary of Differences

Section 2

System Block Diagrams

Section 3

Amiga Expansion

3.1

Designing hardware for the Amiga Expansion Architecture

3.2

Driver Documentation

3.3

Software for Amiga Expansion

3.4

Amiga Expansion Connectors

100Pin

Video Slot

Section 4

PC Bridgeboard

4.1

Description of the PCIXT emulator for the Amiga

2000

4.2

BlOS entry points

4.3

Janus library

Section S

Amiga Hard DisWSCSl Controller

Section6

Custom Chips

Fat Agnus Chip

8520Chip

Section 7

Miscellaneous Hardware Information

7.1

ClocWcalendar registers

7.2

Power budgets

7.3

A2000 PAL equations

7.4

B2000 Jumpers

Appendix

Diagrams

A-l

Backplane Example

A-2

PIC Example

A-3

A500 Exterior (86-pin expansion connector)

A-4

Amiga 2000 Expansion Board Layout

A-S

Amiga 2000 Form Factor

A-6

Amiga 2000Video Card

A-7

86-Pin Slot Expansion Board

A-8

A2000lB2000 Keyboard Connector Pinout

A-9

Amiga 50012000 Mouse Diagram and Pinout

Appendix

Schematics

A2000 Schematics

B2000 Schematics

A500 Schematics

Section

Summary

of Differences

This manual presents technical documentation for three different

Amiga models, comparing them tothe original Amiga, referred toas

model A1 000. Technical information included in this manual

rel-

evant for the following Commodore Amiga models:

the Amiga

500

(A500),

a low-cost version of the origi-

nal Amiga computer, software-compatible with the

A1 000. Unlike the A1

000,

the

A500

has an integrated

keyboard, provision for internal memory expansion up

to 1 megabyte, new-style hardware connectors, and

Kickstart code in

ROM.

Two versions of the Amiga 2000:

theA2000 is software-compatiblewith theA1

000

and

has internal slots, real time clocWcalendarand new-

style hardware connectors.

the B2000,the cost-reduced version of the Amiga

2000,features some different custom chips, but is

otherwise similar tothe A2000.

The B2000 is still under development, and the information present-

ed in this document is subject tochange. The information included on

the B2000 is intended to aid developers in designing software and

peripherals that are applicable for both the current and upcoming

version of the Amiga 2000.

Unless differences are specifically noted, information presented for

the A2000 also holds true for the B2000. The differences between

the two Amiga 2000 models are mainly hardware differences which

will affect peripheral design, but not the way the computersfunction

with software. Section 2 contains system block diagrams for all

three new Amiga models.

KICKSTART

ROM

Both the Amiga 2000and the Amiga 500feature version 1.2 of

lckstart built into

ROM.

Kickstart 1.2 (currently version 33.180)

boots automaticallywhen the Amiga is turned on.

EXTRA

KEYS

THE

Both the Amiga 2000and

500

feature 94-key keyboards, as com-

KEYBOARD

pared to the A1

000's

89-key keyboard. (The European versions of

thekeyboards have

keys.) The new keys areall located on the nu-

meric keypad, and include:

KEY

SCAN

CODE

Left parentheses

(

$5A

Right parentheses

$5B

Slash

$5C

Asterisk

$5D

Plus

$5E

In PC mode on the Amiga 2000 (using a Bridgeboard), these keys

assume typical PC functions, including Number lock (left parenthe-

sis), Print screen (asterisk) and Scroll lock (right parenthesis).

On some keyboards, the left Amiga key has been replaced by the

Commodore key. This key performs identically in either case.

RAW

KEY

CODES

Keyboard Layout Showing Raw Key Codes

THEKEYBOARD

Figure

.l Key Codes

Note:

On the U.S. keyboard, the keys with codes

and

are

extended toinclude the European keys with codes 2Band

30.

respectively. Also note that England uses the

U.S.

rather than

the European keyboard, but not the U.S. keymap.

See Table

atthe end of this section for a table of the raw key

codes.

EXTERNAL SYSTEM

This section describes each I10 interface in detail, and some of the

tradeoffs made with respect to

000compatibility.

The Amiga 2000and Amiga

500

have differences in the serial and

parallel ports from the Amiga 1000,the main difference being

changes in the sex of each port (changingthe serial tofemale and the

parallel to male),which allowsthe new Amigas to use standard inter-

face cables.

RS232

and

MIDI

Port

The RS232 connector on the

A500

and A2000 is form fit and func-

tion identical toa Commodore PC-10120with a fewexceptions.

This

the

OPPOSITE

sex

connector from

the

A1000.

The connector

is a shielded male DB25P connector. The A1 000supplies various

non-standard RS232 signals on the DB25 connector. These non-

standard signals were removed wherever possible. The RS232 con-

nectar

is NOT physically compatible with some

MIDI

interfaces but is

compatible with the ~miga~odem/1200RS (model 1680).Below is

a comparison chart between the RS232 standard,a Hayes Smart-

modem standard, the A1

000

RS232, and the new Amiga 50012000

RS232 connector.

AS001

RS232

A1000 A2000 PC10 HAYES@ DESCRIPTION

GND

TxD

RxD

RTS

CTS

DSR

GND

DCD

S.SD

S.CTS

S.T

TxC

S.R

RxC

S.RTS

DTR

SQD

TxCl

Frame ground

Transmit Data

Receive Data

Request to send

Clear to send

Data set ready

Signal ground

Carrier detect

12volt power

Audio output

Speed Indicate

GND

TxD

RxD

RTS

CTS

GND

DCD

GND

TxD

RxD

RTS

CTS

DSR

GND

DCD

12v

AUDO

CND

TxD

RxD

RTS

CTS

DSR

CND

DCD

12v

GND

TxD

RxD

CTS

DSR

GND

DCD

5Vdc

AUDO

AUDl

INTZ*

volt power

Audio output

Audio input

Port clock 71

6KHz

Interrupt IineJAudio input

AUDl

DTR

5Vdc DTR DTR

DTR Data terminal ready

volt power

Ring indicator

12volt power

3.58MHz

clock

Buffered system reset

C2*

RESB*

you will notice, the

A500

and 2000deletes clocks and interrupt

lines from the A1 000. The

5Vdc and reset lines are also de-

leted. The

12Vdc lines are identical to

PC10120.

The following signals (formerlyon the RS232 connector)can

found

on other connedors:

ResB

parallel connector

video connector

Centronics

Port

The Centronics port also has some non-standard signals. Below

table comparing the A1

000

Centronics port with the

A500lA2000

Centronics port. Again,this is the opposite sex from the A1

000

and the same sex connector as an IBMB-PC (i.e.,a female DB25

connector).

000

ASOO/AZOOO

PC1

Video

Output

DRDY*

Data

Data 1

Data 2

Data

ACK*

BUSY (data)

POUT(clk)

SEL

CND

GND

Reset*

STROBE*

Data

Data 1

Data 2

Data

ACK*

BUSY

POUT

SEL

%*A

5v pullup

RESET*

GND

STROBE*

Data

Data 1

Data 2

Data

ACK*

BUSY

POUT

SEL

AUTOFDXT*

ERROR*

INIT*

SLCT

IN*

GND

The

A500

and A2000, like the A1

000,

use a DB23 video connector.

This 23pin connector contains all the signals necessary toworkwith

a Genlock, but the current Genlock will need

be redesigned in or-

der to meet the physical requirements of the

A500

and

A2000,

in-

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