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- 08/06/95
- Welcome to my first ftp.experiment for quite some time. Please read all of
- this file, especially the Disclaimer below:
-
- Disclaimer
- ----------
- The contents of this part of the ftp server hierarchy are entirely the
- concern of their owner, and are generated, modified and maintained entirely
- by him in his spare time. They do not contribute to any official or
- authorised Acorn project.
-
- Neither the author nor Acorn makes any recommendation, implicit or
- otherwise, for users to carry out their own modifications or servicing of
- Acorn hardware. If you have a machine which is not working and you are not
- confident in your ability to fault-trace a motherboard and perform any
- modifications which emerge as being necessary as a result of correct
- diagnosis, you should take your machine to an authorised Acorn service
- centre.
-
- However, if (like me) you are one of those people who carries a logic probe
- "just in case" and has a decent dual-beam CRO (with service manual) at home,
- please follow the safety procedures detailed in the /pub/documents/safety/*
- hierarchy on this server. Power supplies and monitors are safety-critical
- items, and are NOT TO BE SERVICED except by qualified personnel, hence
- details of their internals are omitted from this collection.
-
- Acorn accepts no responsibility for the correctness or legibility of the
- information presented. The information is presented in good faith by the
- file owner, to whom all problems should be reported.
-
- Introduction and Raison d'Etre
- ------------------------------
- The service I am contemplating providing is an online library of Acorn
- circuit diagrams. Obviously I can't provide circuit diagrams of our current
- hardware (these matters are in the realm of our service centres), so instead
- I would like to provide (eventually) circuit diagrams for:
-
- All the System range (1, 2, 3 and 5)
- Atom
- BBC Models A and B (several issues)
- BBC Model B (US variant)
- BBC Model B+
- Z80, 6502 and 32016 Second Processors
- Model B / Master Hard disc interface
- Master 128
- Master Turbo
- Master AIV (the Domesday system)
- Econet interface
- Archimedes 300 series
- Archimedes 400 series
- Archimedes 400/1 series
- Archimedes 540
-
- Please note that this list is provisional and subject to change; right now,
-
- Econet interface
- Archimedes 300 series
- BBC Model B (issues 2 onwards)
- Archimedes 400/1 series
- Archimedes 440
- Master 128 Sprites only, so far.
-
- are available for download.
-
- I'm doing this for two reasons:
-
- 1. this service is something I would want to see if I was an external user
- 2. nobody else (to my knowledge) has done it before.
-
- Formats
- -------
- Most of the circuit diagrams for these machines only exist in paper form (at
- least, they only did until I digitised them). If your feedback convinces me
- this service would be valuable, I can do some further experimentation to see
- if I can successfully outline these diagrams into Drawfiles. As it is, for
- simplicity and compactness, the sprites have been turned into GIF87s (to be
- viewed using xv, etc). Experimentation showed me that the images are
- sufficiently huge that !ChangeFSI cannot cope with the image tables required
- for GIF > Sprite translation on an 8Mb machine, so I have also supplied the
- original sprites, archived using SparkFS (and decompressable using
- !SparkPlug, which can be built by downloading and running
- /pub/riscos/releases/dearchive.bas from this system).
-
- Each sheet of the diagrams tends to be A3 (landscape) size; as I have an A4
- scanner, each sheet has ben scanned in two halves. Files named "Part1" are
- the left hand side, and files named "Part2" are the right hand side of
- a given sheet.
-
- Feedback
- --------
- The intention is to expand this collection to something approaching a
- reasonable size, if users would find such a resource useful. If you have any
- comments, feedback, hints on image processing to improve the quality of the
- diagrams, (reasonable!) requests for specific diagrams, etcetera please
- email me (dwalker@acorn.co.uk) with details.
-
- Happy hacking,
-
- Dave Walker
-
- INDG