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: (3) References to left and right hand apply when the unit is viewed from the FRONT unless otherwise stated. -> cat -help 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