Specifications

Acorn Enhanced Expansion Card Specification

Safety 22

The spread of fire 22

Hazardous voltages or energy 22

Safety testing: Electricity at work regulations, 1989 22

EMC design 22

Mechanical specification 23

Blanking panels 23

Archimedes 300 series and 440 computers and R140 workstations 23

Fitting 23

Marking 23

Appendix A: Mini Expansion Card Specification

Introduction A-1

Types of mini expansion card A-1

IOC access mini expansion cards A-1

MEMC access mini expansion cards A-1

Notes on expansion card specification A-1

System architecture A-1

I/O space memory map A-1

Data bus mapping A-1

MEMC mini expansion card timing A-1

Signals A-2

Power specification A-2

Mechanical specification A-2

Additional points A-2

Appendix B: DMA Extended Bus Interface

Introduction B-1

DMA B-1

EASI B-1

Major features of DEBI B-1

Description of signals B-2

DMA control B-2

Signal timings B-3

Extended address space (EASI) timings B-3

DMA access timings B-4

DRQ timings B-5

Electrical characteristics B-6

Design considerations B-7

Risc PC expansion bus backplane B-7

Firmware support B-7