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I~ PREFACE This service manual contains all the information required for the after-sales service that is required to maintain the high quality and reliability of the ACT APRICOT executive micro-computer. It is assumed throughout this manual that all service personnel involved in the maintenance of the ACT APRICOT already have an in-depth knowledge of digital electronics, with particular emphasis on micro-computer techniques. This manual contains information relevant to the total APRICOT range. Illustrations and photographs used are of the twin floppy drive version. Please refer to relevant sections for variations. ACT (International) Ltd.
wishes to acknowledge the co-operation of the following companies for giving their permission in allowing the reproduction of their proprietry information: SONY (UK) LTD. National Panasonic (UK) Ltd. Texas Instruments Ltd. QED (Product Design) Ltd. The information in this manual is subject to change without notice and does not represent a commitment on the part of ACT. The software description in this manual is furnished under a license agreement. The software may be used or copied only in accordance with the terms of the agreement. It is against the law to copy any disk supplied for any purpose other than the purchaser's personal use. © Applied Computer Techniques PLC 1983.
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CONTENTS I Chapter 1 General description Specification Installation Safety precautions Recommended tools and equipment Assembly and disassembly Electrical system Electronic system Memory map Set-up procedures Trouble-shooting Diagnostic programs 2 3 4 5 6 7 8 9 10 Expansion Boards Appendix 11 Winchester A Monitor B Disk drive C Parts list D PSU E Circuit diagrams, wiring diagrams Index
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INDEX r> Assembly and Features 1.2 Disassembly 5.1 Fuses 3.2 AC Sub Assembly 6.3 Floppy Disk Controller 7.13 Async Cable Installation 2.1 Connection 6.19 In terconnection Block Diagram Apricot 7.22 Diagram 6.2 Conversion 240V -115V 6.4 I/O Section 7.11 Connectors Pin-Outs 6.6 I/O Port Address 7.20 Circuit Diagrams E1 I/C Catalogue 7.23 Disassembly Modem Cable Rear Panel 5.3 Connection 6.19 AC Sub Assembly 5.4 Memory 7.6 Motherboard 5.5 Memory Map 7.38 Chassis Bridge Monitor A.1 Assembly 5.6 Mnemonics 7.34 Disk Drives 5.7 Parts Description 1.5 Front Bezel and Door 5.8 Main Chassis 5.9 Printer Cable Power Supply 5.9 Parallel 6.20 Handle 5.9 Serial 6.21 Speaker 5.9 Processor Structure 7.7 Monitor 5.10 Parallel Interface 7.14 Keyboard 5.11 Parts List C.1 5.12 Power Supply E.1 5.13 Recommended Tools 4.1 Diagnostic Recommended Boot Prom Equipment 4.1 Documentation Error Codes 9.1 Specification 1.4 Programs 9.5 Safety Precautions 3.1 Disk Drive B.1 System Outline 7.3 Electrical System 6.1 Sound Generator 7.11 Serial Interface 7.18 Earthing 6.5 Set-Up Procedure 8.1 Expansion Information 6.16 Electronic System 7.1 Timer 7.16
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GENERAL DESCRIPTION rn I FEATURES Processor architecture 8086 running at 5mHz 8089 I/O processor 8087 Optional Maths co-processor Memory 256 Kbytes expandable to 768 Kbytes Mass storage One or two 3.5" Sony mirco-floppy disk drives- 315 Kbytes each or One or two 3.5" Sony double sided micro-floppy disk drives-360 Kbytes each side Display 9" green P39 phosphor with antiglare filter 80 characters x 25 lines Resolution:
800 x 400 pixels I/O 1 x RS232 (V-24) serial port 1 x 8-bit Centronics parallel printer port Optional on-board modem with auto-dial 2 x expansion slots 1 x "Mouse" port Keyboard Soft QWERTY keyboard with 8 fixed function keys and 6 touch sensitive keys labelled by LCD Micro- Screen (tm). Built-in 4 function calculator. Time/Date display with battery back-up. Safety/radiation standards Meets UL VDE BS415 CSA FCC-B
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