Acorn A5000 Especificações descarregar pdf (Página 3)

Acorn Enhanced Expansion Card Specification

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Contents

Acorn Enhanced Expansion Card

Introduction 1

DEBI 1

Acorn expansion bus 1

Physical dimensions 1

Types of expansion card 2

Acorn machine range I/O type inclusions 2

System architecture 3

Expansion card access speed 3

Expansion card size 3

Data bus mapping 4

Expansion card interrupt handling 4

Expansion card interrupt mask register 5

Expansion card interrupt status register 5

Layout and drive 5

Heating 5

Expansion card identity 6

Expansion card identity space 6

Code space 6

Expansion card identity low byte 6

Expansion card presence 6

Expansion card interrupts 6

ID field 7

Conformance bit 7

Identification extension 7

FIQ and IRQ status 7

Country code 7

Manufacturer’s code 8

Product type code 8

Interrupt status pointers 8

Chunk directory structure 8

Operating system identity byte 9

Examples of use 9

IOC expansion cards 10

Expansion card accesses 12

MEMC expansion cards 18

I/O controller interface 18

MEMC expansion card timing 21

The Acorn enhanced expansion bus backplane pin-out 21

C bus 21

Reset 21

Power consumption 21

1 2 3 4 5 6 7 8 ... 39 40

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