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Acorn ABC 210/Cambridge Workstation ACORN COMPUTERS LTD. ACW 443 SERVICE MANUAL 0420,001 Issue 1 January 1987 ACW SERVICE MANUAL Title: ACW SERVICE MANUAL Reference: 0420,001 Issue: 1 Replaces: 0.56 Applicability: Product Support Distribution: Authorised Service Agents Status: for publication Author: C.Watters, J.Wilkins and Others Date: 7 January 1987 Published by: Acorn Computers Ltd, Fulbourn Road, Cherry Hinton, Cambridge, CB1 4JN, England Within this publication the term 'BBC' is used as an abbreviation for 'British Broadcasting Corporation'. Copyright ACORN Computers Limited 1985 Neither the whole or any part of the information contained in, or the product described in, this manual may be adapted or reproduced in any material form except with the prior written approval of ACORN Computers Limited ( ACORN Computers). The product described in this manual and products for use with it, are subject to continuous development and improvement. All information of a technical nature and particulars of the product and its use (including the information and particulars in this manual) are given by ACORN Computers in good faith. However, it is acknowledged that there may be errors or omissions in this manual. A list of details of any amendments or revisions to this manual can be obtained upon request from ACORN Computers Technical Enquiries. ACORN Computers welcome comments and suggestions relating to the product and this manual. All correspondence should be addressed to:- Technical Enquiries ACORN Computers Limited Newmarket Road Cambridge CB5 8PD All maintenance and service on the product must be carried out by ACORN Computers' authorised service agents. ACORN Computers can accept no liability whatsoever for any loss or damage caused by service or maintenance by unauthorised personnel. This manual is intended only to assist the reader in the use of this product, and therefore ACORN Computers shall not be liable for any loss or damage whatsoever arising from the use of any information or particulars in, or any error or omission in, this manual, or any incorrect use of the product. This manual is for the sole use of ACORN Computers' authorised service agents and must only be used by them in connection with the product described within. ACW SERVICE MANUAL Third Party Copyright Notice Some sections of this manual are copyright of MICROVITEC PLC and are subject to the following copyright notice: COPYRIGHT © 1986 MICROVITEC PLC The copyright in this work is vested in MICROVITEC PLC and this document is issued for the purpose only for which it is supplied. No licence is implied for the use of any patent literature. It must not be reproduced in whole or in part, or used for tendering or manufacturing purposes except under an agreement or with the consent in writing of MICROVITEC PLC and then only on the condition that this notice is included in any such reproduction: Information furnished is believed to be accurate but no liability in respect of any use of it is accepted by MICROVITEC PLC. 2 ACW SERVICE MANUAL WARNING THE COMPUTER MUST BE EARTHED IMPORTANT The wires in the mains lead for the apparatus are coloured in accordance with the following code: Green & Yellow Earth Blue Neutral Brown Live The moulded plug must be used with the fuse and fuse carrier firmly in place. The fuse carrier is of the same basic colour (though not necessarily the same shade of that colour) as the coloured insert in the base of the plug. Different manufacturers' plugs and fuse carriers are not interchangeable. In the event of loss of the fuse carrier, the moulded plug MUST NOT be used. Either replace the moulded plug with another conventional plug wired as detailed below, or obtain a replacement fuse carrier from an authorised ACORN dealer. In the event of the fuse blowing it should be replaced, after clearing any faults, with a 5 amp fuse that is ASTA approved to BS1362. If the socket outlet available is not suitable for the plug supplied, the plug should be cut off and the appropriate plug fitted and wired as previously noted. The moulded plug which was cut off must be disposed of as it would be a potential shock hazard if it were to be plugged in with the cut off end of the mains cord exposed. As the colours of the wires may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured green and yellow must be connected to the terminal in the plug which is marked by the letter E, or by the safety earth symbol ,or coloured either green or green and yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter N, or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter L, or coloured red. Protecting the Winchester Disc Winchester disc drives are fragile to avoid damage or data loss, do not move or knock the Acorn Cambridge Workstation (ACW) while it is running. The ACW must always be moved gently, and not tilted rapidly, or turned on its side. After using the ACW, the heads should be moved to the parking zone BEFORE switching off the mains power. The exact command that needs to be used to park the heads will depend on which program is in control. For instance: (1) From PANOS (-> or user defined prompt: -> Logoff ADFS: (RTN) -> .Quit (RTN) Turn off Power. (2) From PANDORA (* prompt) *ADFS (RTN) *BYE (RTN) ACW SERVICE MANUAL 3 Turn off Power. (3) From BASIC (> prompt) > *ADFS (RTN) > *BYE (RTN) Turn off Power (4) From UNKNOWN or IF IN DOUBT (CTRL) and (BREAK) together will return to a prompt, then follow one of the above depending on which prompt it is. If anything is typed after parking the Winchester heads, in particular (BREAK) or *ADFS there will be a pause while the Winchester mechanisim winds back in the heads. Transportation Before switching off prior to transporting the ACW the Winchester disc head mechanisim must be "Parked" as described above in the section "Protecting the Winchester Disc". If you need to transport the ACW, pack the original protective expanded polystyrene around the sides of the machine, keeping the ACW in the upright position. Lower the combined package carefully into the cardboard box in which the machine was supplied, again, making sure that the ACW remains upright. The Service Card supplied with each unit and specific to that unit should always travel with it. User Registration User Registration Card is supplied with the hardware. It is in your interest to complete and return the card. Please notify Acorn Computers Limited if this card is missing. 4 ACW SERVICE MANUAL 1. Introduction 1.1 Function of this manual This manual is intended to provide the information required to diagnose and repair faults on the Acorn Cambridge Workstation (ACW) series microcomputers. It gives the complete overview of the ACW system for Acorn dealers and service engineers. It is assumed that the reader is familiar with the ACW operating system and has access to the user-guide documentation and utility software including the supplied users' test routines. 1.2 Conventions observed in this guide The following conventions are observed: (1) (BREAK) (RETURN) (ESCAPE) (SHIFT) and (CTRL) signify the corresponding keyboard keys rather than the actual words. It is assumed that command lines are terminated by (RETURN) . Refer to the keyboard diagram for actual symbols used on these keys. (2) In examples where commands have to be typed in response to a prompt (e.g. the Panos prompt '->'), both the command and the prompt are shown; for example: -> cat -help (3) References to left and right hand apply when the unit is viewed from the FRONT unless otherwise stated. Abrieviations The following abrieviations are used in this manual: N = Active low signal (eg. NCAS) LSB = A0,D0 etc. MSB = A23,D15 etc. Word = two bytes = 16 bits Double Word = four bytes = 32 bits Quad = eight bytes = 64 bits NYA = Not yet available RSVD = Reserved for future (Acorn) use HHHHHH = Hex = Hexadecimal notation BBBBBB = Bin = Binary notation 1.2.1 ACW documentation The ACW 443 comes complete with the following documentation: • ACW welcome guide • Terminal emulator user guide • BBC BASIC IV reference manual • ACW function keycard booklet • Panos documentation pack (A seperate package) Documentation titles, together with their Acorn part numbers, are shown in the appendix. ACW SERVICE MANUAL Issue 1 5 Chapter 1 1.3 Hardware overview 1.3.1 ACW 443 The ACW uses the National Semiconductor 32000 chip set, including the NS32016 Central Processing Unit ( CPU),the NS32081 Floating Point Unit (FPU) and the 32201 timing and control unit (TCU). These have a 32-bit internal architecture and use a 16-bit external data bus. The Workstation also contains a 6512 processor (an enhanced version of the 6502 processor), which acts as an input/output (I/0) processor and can also be used independently. In this case the Workstation acts as a BBC model B+ microcomputer with 64 Kbytes of memory. The ACW is supplied with the PANOS operating system kernel (PANDORA) installed on the 32016 card. This provides PANOS with an access mechanism to the various BBC filing systems in the I/0 processor. 4M bytes of internal RAM memory are provided as standard on the 32016 processor card, and a 700Kbyte 80- track floppy disc and a 20Mbyte hard disc storage is fitted on the model 443. Keyboard activity, the screen output, disc interface, network interface and other general I/O tasks are all handled by the 6512A processor, which has its own 64Kbytes of local RAM.
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