Acorn A5000 Especificaciones

Acorn Enhanced Expansion CardSpecification(formerly Acorn expansion card specification)

6 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion Cardmust be installed to improve the ventilation, if not alreadyfitted.E

Acorn Enhanced Expansion Card Issue 5, August 1994 7Acorn Enhanced Expansion Cardbyte of the ECId. In this way the operating system canquickly find

8 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion CardManufacturer’s codeEvery expansion card should have a manufacturer’s

Acorn Enhanced Expansion Card Issue 5, August 1994 9Acorn Enhanced Expansion Cardpaged) ROM into main memory, and as such is capableof updating the

10 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion CardFigure 3: Extended ECldExtended expansion card identity with pagedR

Acorn Enhanced Expansion Card Issue 5, August 1994 11Acorn Enhanced Expansion CardFigure 5: Extended ECId with paged ROMFigure 6: IOC driving an exp

12 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion CardFigure 7: Stretched expansion card read cycleREF8MIORQIOGTPSPRERBEB

Acorn Enhanced Expansion Card Issue 5, August 1994 13Acorn Enhanced Expansion CardFigure 10: Medium cycle readPSPREBD[0:15]LA[2:15]PR/WCLK8REF8MFigu

14 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion CardFigure 12: Fast cycle readFigure 11: Medium cycle writeREF8MPSBD[0:

Acorn Enhanced Expansion Card Issue 5, August 1994 15Acorn Enhanced Expansion CardFigure 14: General timing for slow, medium, and fast cycle typesSy

iiAcorn Enhanced Expansion Card SpecificationCopyright  1994 Acorn Computers Limited. All rights reserved.Published by Acorn Computers Technical Publ

16 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion CardFigure 15: Synchronous cycle readREF8MIORQ (A)IOGTPSBLBD[0:15]LA[2

Acorn Enhanced Expansion Card Issue 5, August 1994 17Acorn Enhanced Expansion CardFigure 16: Synchronous cycle writeREF8MIORQ (A)IOGTPSBLBD[0:15]LA

18 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion CardFigure 17: Timings for synchronous cycle typesREF8MPSPWEBD[0:15]LA[

Acorn Enhanced Expansion Card Issue 5, August 1994 19Acorn Enhanced Expansion CardA MEMC I/O cycle is shown in Figure 18 below. Thecycle starts with

20 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion CardFigure 21: MEMC expansion card timingPH2REF8MIORQIOGTMSBLwriteBLrea

Acorn Enhanced Expansion Card Issue 5, August 1994 21Acorn Enhanced Expansion CardMEMC expansion card timingA typical cycle with timing parameters i

22 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion CardSafetyThe current industry wide IT safety standard is IEC950whose E

Acorn Enhanced Expansion Card Issue 5, August 1994 23Acorn Enhanced Expansion Cardshown on Acorn drawing Number 0297,093. Thegasket is fitted on the

24 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion Card

Appendix A Issue 5, August 1994 A-1Mini Expansion Card SpecificationAppendix A: Mini Expansion Card SpecificationIntroductionThis appendix describes

Acorn Enhanced Expansion Card SpecificationiiiContentsAcorn Enhanced Expansion CardIntroduction 1DEBI 1Acorn expansion bus 1Physical dimensions 1Type

A-2 Issue 5, August 1994 Appendix AMini Expansion Card SpecificationPower specificationThe following table gives the maximum powerrequirements for th

Appendix B Issue 5, August 1994 B-1DMA Extended Bus InterfaceAppendix B: DMA Extended Bus InterfaceIntroductionThis appendix describes the DMA Exte

B-2 Issue 5, August 1994 Appendix BDMA Extended Bus InterfaceDescription of signalsThe following table shows the complete pin-out of theAcorn enhanc

Appendix B Issue 5, August 1994 B-3DMA Extended Bus InterfaceSignal timingsExtended address space (EASI) timingsThe Extended Address Space Interfac

B-4 Issue 5, August 1994 Appendix BDMA Extended Bus InterfaceDMA access timingsThe DMA access timings for Cycle types A, B, C, and Dare as follows:T

Appendix B Issue 5, August 1994 B-5DMA Extended Bus InterfaceDRQ timingsDesign notesIt is allowable to keep DRQ asserted if a peripheral wantsto pe

B-6 Issue 5, August 1994 Appendix BDMA Extended Bus InterfaceElectrical characteristicsTable 6: Electrical characteristicsParameter Symbol Min Typ M

Appendix B Issue 5, August 1994 B-7DMA Extended Bus InterfaceDesign considerationsIt is recommended that all bus signals on an expansioncard that a

B-8 Issue 5, August 1994 Appendix BDMA Extended Bus Interface

Reader’s Comment FormAcorn Enhanced Expansion Card Specification (Issue 5)We would greatly appreciate your comments about this Manual, which will be ta

ivAcorn Enhanced Expansion Card SpecificationSafety 22The spread of fire 22Hazardous voltages or energy 22Safety testing: Electricity at work regulat

Acorn Enhanced Expansion Card Acorn Enhanced Expansion Card Issue 5, August 1994 1Acorn Enhanced Expansion CardIntroductionThis document outlines the

2 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion Cardthe single Eurocard dimension only – double Eurocardswill not fit. A

Acorn Enhanced Expansion Card Issue 5, August 1994 3Acorn Enhanced Expansion CardNote: ✽ denotes an I/O interface which is residentoutside of the ma

4 Issue 5, August 1994 Acorn Enhanced Expansion CardAcorn Enhanced Expansion Cardand D. The slowest cycle type is A and the quickest is D– cycle type

Acorn Enhanced Expansion Card Issue 5, August 1994 5Acorn Enhanced Expansion Carddrive the PIRQ line low. Both interrupt lines have aresistive pullu