Commodore A 2286 Bedienungsanleitung

Commodore

A 2286

AT Emulator Card

Service Manual

1/89

Commodore

AT Emulator-Card

TABLE OF CO TE TS

Specifications 11.2

Installing Bridgeboard 11.3

Jumper Location 11.4

So Ider Jumper 11.6

Spare arts List 11.8

Schematics Main 11.20

Schematics Baby 11.33

5.25" Drive 11.40

A2286 SPECIFICATIO S

Card Type: Uses both Amiga bus (100 pin) and IBM-PC/XT bus

System of the Amiga A2000 (goes into combined position).

Function: Provides an 80286 co-processor System with IBM-PC/AT

compatibility. Uses AutoConfig features of the Amiga.

Socket for 80287 math co-processor.

DATA - 80286 SIDE

Clock Speed: 8 MHz

Memory: 1024 kByte RAM

ROM: 16 kByte BIOS

Interfaces: 1 internal floppy disk drive 5.25" 1.2 Mbyte capacity

1 internal floppy disk drive 3.5” 720 Kbyte capacity

(optional)

Parallel Port ( Centronics, IBM-PC compatible emulated

on Amiga parallel port).

Slots: 1 IBM-PC/AT / 2 IBM-PC compatible full size slots

Keyboard: AT keyboard emulated on the Amiga keyboard

Video Display: IBM-PC monochrome text mode and color mode are

emulated in seperat AmigaDOS Windows simultaneously.

System Software: MS-DOS

Inter-System

Communication:

DATA - AMIGA SIDE

64 kByte dual-port RAM as inter-process buffer

64 kByte dual-port scratch memory on Amiga side

Interrupt logic

Janus emulation Software

BUS I TERFACE

Type: Fast dual-port memory, full speed CPU access during

System DMA

Card Size: Full size Amiga 2000 card

Power: Supplied by System

Inciuded Items: Janus emulation Software on 3.5” floppy disk

Internal floppy disk drive 5.25”, 1.2 Mbyte capacity

Chapter 11

Installing the Bridgeboard Hardware

Before you install the Bridgeboard in your A2000, TUR OF ALL POWER. It may make

it physically easier to install the Bridgeboard if you disconnect some or all of the

equipment connected to the A2000. Before you try to operate the unit, be sure to read

all the installation and setup instructions in the Bridgeboard users guide, and reconnect

any equipment you may have disconnect.

Where the Bridgeboard Goes:

The Bridgeboard plugs into the internal expansion slot area located at the left of the

A2000.

There are five slots on the Amiga System bus and four slots on a secondary bus that is

IBM PC/XT-compatible. Two pairs of slots (a pair being one slot on the Amiga bus and

one slot on the IBM bus) are physically situated to allow the Bridgeboard to be inserted.

Bridge

Slots

Amiga 100 Pin

Slots

Bridge

Slots

d-QOO-c

XT-Compatible Slots

AT-Compatible Slots

Amiga 86 Pin

Slot

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Chapter11

Function: Speaker (Signal with 33R serial resistor)

Po ition: main board

Function: enable/disable onboard FDC

Po ition: main board

onboard FDC

enabled onboard FDC

disabled

Function: enable/disable 384 above memory

Po ition: baby board

above memory

enabled above memory

disabled

Function: floppy disk select

Po ition: baby board

PS/2 type

1.44 Mbyte AT type

1.2/1.44

Function: test connector

Po ition: main board

J13

Function: battery connector for RTC

Po ition: main board

J14

Function: video startup mode select

Po ition: baby board

monochrome color

11—4

Chapter 11

JS1A / JSlB

Function: DMA speed select

Po ition: main board

JS1A closed, JSlB open : DMA works at sysclock/2 speed

(default)

JSlB closed, JS1A open : Dma works at sysclock speed

JS2A / JS2B

Function: RAS to CAS Signal delay select

Po ition: baby board

JS2A closed, JS2B open : RAS to CAS delay is 50 ns (default)

JS2B closed, JS2A open : RAS to CAS delay is 75 ns

JS4A / JS4B

Function: Onboard or external 16MHz Oscillator select

Po ition: baby board

JS4A closed, JS4B open : selects 16 MHz for FDC from main

PCD (default)

JS4B closed, JS4A open : selects 16 MHz from U69

(JS4B should only be closed, if

oscillator U69 is stuffed)

JS5A / JS5B

Function: BIOS EPROM type select

Po ition: baby board

JS5A closed, JS5B open : 27128 EPROM (default)

JS5B closed, JS5A open : 27256 EPROM

11 5

Chapter11

JS7A / JS7B / JS7C / JS7D

Function: APU 80287 speed select

Po ition: main board

JS7B / JS7D closed

JS7A / JS7C open

JS7B / JS7D open

JS7A / JS7C closed

JS8A / JS8B

Function: real time clock bus timing select

Po ition: baby board

JS8A closed, JS8B open : 80286 timing (default)

JS8B closed, JS8A open : 27256 MOTOROLA timing

: APU runs at sysclk speed (default)

: APU runs at sysclk/2 speed

JS9

Function: real time clock standby mode

Po ition: baby board

JS9 closed : standby mode (default)

JS9 must be closed

JS10A / JS10B

Function: real time clock bus timing select

Po ition: baby board

JS10A closed, JS10B open : selects FE 3000 A (default)

JS10B closed, JS10A open : selects FE 3000 (8MHz Version)

JS11

Function: FDC write precompensation select

Po ition: baby board

JS11 open : selects 125 ns (default)

JS11 closed : selects 187 ns

JS12

Function: FE 3000 / FE 3000 A select switch

Po ition: main board

JS12 open : selects FE 3000 A (10MHz Version)

(default)

JS12 closed : selects FE 3000

1 1 -6

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11—8

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