1 Licence Agreement for AcornElectronMainboard
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3
4 Copyright (C) 2022, 2023 Paul Boddie <paul@boddie.org.uk>
5
6 This program is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free Software
8 Foundation; either version 3 of the License, or (at your option) any later
9 version.
10
11 This program is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
14 details.
15
16 You should have received a copy of the GNU General Public License along with
17 this program. If not, see <http://www.gnu.org/licenses/>.
18
19 Acknowledgements
20 ----------------
21
22 The information provided in various forms within this distribution is based on
23 the circuit diagram previously published in the following book:
24
25 Adrian C. Dickens, Mark A. Holmes, "The Advanced User Guide for the Acorn
26 Electron", Acornsoft/Adder Publishing, ISBN 0947929037
27
28 Of specific relevance is the following statement from that publication:
29
30 "The Authors gratefully acknowledge Acorn Computers Limited for their kind
31 permission to reproduce the complete Electron circuit diagram."
32
33 The revised version of the Advanced User Guide undertaken by the community
34 also includes the following notes of relevance:
35
36 "Third edition Jan 2019, by stardot.org.uk members. Revised diagrams based on
37 those drawn by C. Dewhurst."
38
39 Thanks are also due to John Simpson for his continued work on revising the
40 Advanced User Guide, including the circuit diagram, over many years.
41
42 Notes on the licence choice and its application to this work
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44
45 Although the above statement refers to a "program", the licence itself uses
46 this term to refer to "any copyrightable work". In this case, the work
47 consists of schematics, circuit layout details and other data, and the
48 application of this licence is intended to govern the further distribution of
49 these materials in addition to any programs or software that might also be
50 included in the work.
51
52 When making hardware using the materials featured in this work, be sure to
53 provide corresponding sources (schematics, circuit layouts) or to make them
54 available on request, as indicated by the licence terms. Where a modified form
55 of the work is distributed, the relevant changes must be incorporated into the
56 source files that were actually edited to produce the desired, modified
57 result.
58
59 It is not generally acceptable to provide only modified output files when
60 distributing modified forms of this work. For example, it is not acceptable to
61 change the circuit layout file in a PCB editing program and then withhold this
62 modified file from recipients by insisting that only the Gerber files were
63 edited directly. Only if the Gerber files were actually edited directly may
64 modified versions of such files be considered source-level changes. Even then,
65 such modifications on files that are the product of other, more abstract,
66 files are not recommended as they rarely uphold a sustainable development
67 approach.
68
69 To conclude, when producing unmodified versions of this work, you should make
70 these materials available to recipients. When producing modified versions, you
71 should make the exact materials you used available to recipients.
72
73 You should preserve the copyright and licensing notices present in this work
74 regardless of any modifications you make to the work. However, where a
75 copyright notice appears on the hardware itself (being analogous to a message
76 that a program might display to communicate such information to its users), you
77 may choose to extend the notice to take your modifications into account, or you
78 may choose to replace it with a reference to a resource providing all
79 applicable copyright and licensing information.