Documentation for “Zerocat PS/2-Keyboard”
Generated on: Tue, 03 Jun 2025 19:11:09 +0200
Repository: git://zerocat.org/zerocat/projects/ps2-keyboard
Version: v0.0.3-0-f8107d0
Branch: master
Copyright (C) 2017, 2018, 2020, 2021, 2022, 2023 Kai Mertens kmx@posteo.net
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
The goal of Zerocat PS/2-Keyboard is to provide you with a save keyboard, driven by a free-design microcontroller board.
It is assumed that you are running a GNU/Linux-libre operating system. We recommend to run GNU Guix System – alternatively, install the GNU Guix package manager.
Use Git to clone the project’s sources:
$ git clone git://zerocat.org/zerocat/projects/ps2-keyboard
Change into the project’s documentation folder:
$ cd ps2-keyboard/doc/
Study this README.md to get started:
$ cat ../doc/README.md
All paths within the documentation are relative to the location of the
documentation source files, which are located in this project’s doc/
folder.
Versions are tagged according to the following pattern:
v<major>.<minor>.<revision>
<major> – The resulting product is a major change or upgrade.<minor> – Additional functionality or new features are introduced.<revision> – Bug fixes, minor changes, graphical stuff.A tag should be annotated with related change log entries.
The first tag should be: v0.0.0
To checkout a version tag, run:
git checkout vx.x.x
However, this should be optional.
Using the tip of branch master should be just fine.
Use GNU Make to create a dedicated profile, and an up-to-date profile generation. This allows you to match your environment to the one used by Zerocat, thus yielding for bit-identical results:
$ make -C ../guix pull
Checkout the profile generation, instantiate channels, create a pure shell that provides nothing but prerequisites:
$ make -C ../guix environment
To confirm that your project environment is properly set up, run:
[env]$ make -C ../guix usage
Invocations of make to generate the documentation, compile the
sources, etc., should be done from this project environment, only.
To restore the initial environment, later on, when you are done with this project, type:
[env]$ exit
To remove this project’s handy guix profile, type:
$ make -C ../guix clean
This will remove symlinks only. If you want to remove the profile from your system, run the GNU Guix Garbage Collector.
To list all available targets, type:
$ make -C ../guix help
To build the documentation, type:
[env]$ make -C ../doc
The terminal output should provide a shortcut to the index.html file
of the generated HTML documentation. Open this file with your favorite
browser.
To get a full list of available targets, type:
[env]$ make -C ../doc help
To clean-up, type:
[env]$ make -C ../doc clean
To build the documentation in one go, type:
$ echo "make -C ../doc" | make -C ../guix environment
Documentation source files are written in markdown syntax. They should carry their individual copyright and license notices right below the title giving headline, e.g.:
<Title-of-Document>
===================
Copyright (C) <Year> <Name-of-Author> <Email-Address>
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. A copy of the license is included in the section entitled
"GNU Free Documentation License".
<Other-Headline>
----------------
...content...
The generated documentation carries a license notice right at top on
its title page, with copyright statements generated from git log
output.
Sections of the generated documentation are build from selected markdown source files, with their individual copyright and license notice stripped.
In order to enrich the generated documentation ...
*.md markdown source files to ../doc/.... and adapt ../doc/Makefile to produce nice output.
In case more tools are needed, don't forget to update ../guix/manifest0.scm.
To make your image look nice within the documentation, select a landscape layout of 16:9 aspect ratio.
Use ImageMagick to prepare your image, e.g.:
If your image is big, reduce it to a maximal width of 2000 pixel:
mogrify -resize 2000x <image>
Please clean image files from metadata, before committing, i.e.:
mogrify -strip <image>
If you embed your image into a markdown documentation file, use this syntax:
![<path/to/image>][]
[<path/to/image>]: <path/to/image> "title message"
or alternatly:
![<path/to/image>][my-image-shortcut]
[my-image-shortcut]: <path/to/image> "title message"
These patterns will guarantee that <img> tags will have their src,
alt and title attributes properly set within the html output.
Please use this license header for code source files:
Zerocat PS/2-Keyboard --- Get rid of spyware.
Copyright (C) <Year> <Name-of-Author> <Email-Address>
This file is part of Zerocat PS/2-Keyboard.
Zerocat PS/2-Keyboard is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation, either
version 3 of the License, or (at your option) any later
version.
Zerocat PS/2-Keyboard is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Zerocat PS/2-Keyboard.
If not, see <http://www.gnu.org/licenses/>.
If you intend to write shell scripts, use this skeleton to make them work for GNU Guix:
#!/bin/sh
# Re-exec if we are not using Bash or are using Bash in POSIX mode.
if [ -z "$BASH" ] || [ "$BASH" = "/bin/sh" ]; then
bash=`command -v bash`
if [ -z "$bash" ]; then
echo "Couldn't find Bash, sorry!"
exit 1
else
exec "$bash" "$0" "$@"
fi
fi
# We're using Bash now.
set -o errexit
set -o nounset
set -o pipefail
# Your code goes here ...
Update ../doc/CHANGES.md and list your contributions.
You can use git shortlog to get a starting point for your edit.
Zerocat PS/2-Keyboard ships copyrighted work.
Zerocat PS/2-Keyboard is free software. It makes use of free software licenses as recognized by Free Software Foundation (FSF), and should be freely distributable:
Files located in folder hardware/, if available, describe hardware
of a free design, licensed under:
Authorship, copyright and license information may be provided in more detail on a per-folder and/or per-file basis. Check the sources.
Please report a bug if you find the distribution hindered.
See Zerocat Website for contact information.
Change Logs can be created with:
git shortlog vx.x.x..HEAD | tac | sed -r -e '1d; s/^[ ]*/* /; $d;' -
Refine documentation layout for centered pages and wide viewports.
git log output.Source Files
Generated Images
What about ground connection? Ground Loop?
+-----------------------+ +----------------------+
| | | |
| ASRock E350M1 |<-- USB Power -->| Zerocat |
| Coreboot Machine |<---- PS/2 ----->| PS/2 Controller |
| with PS/2 Port, | | Board |
| no Keyboard attached | | |
| | +----------------------+
+-----------------------+ ^
^ |
| |
| RS232
| |
| |
| v
+-----------+ +----------------------+
| | | |
| 230VAC |------------------->| Laptop ZC-X60 |
| Power | | + Docking |
| | | + RS232 Port |
+-----------+ | |
| uploads firmware, |
| issues key-strokes |
| |
+----------------------+
+-----------------------+
| | +----------------------+
| Laptop ZC-T60 | | |
| + Docking |<-- USB Power -->| Zerocat |
| + RS232 Port? |<---- RS232 ---->| PS/2 Controller |
| + PS/2 Port |<---- PS/2 ----->| Board |
| | | |
| | +----------------------+
+-----------------------+
^
|
|
+-----------+
| |
| 230VAC |
| Power |
| |
+-----------+
Nothing evolved, so far. Let’s start with this basic board:
Board Schematic PNG Preview
Article about USB Security Flaw
https://en.wikipedia.org/w/index.php?title=PS/2_port
General info about PS/2
http://www.computer-engineering.org/ps2keyboard/
The PS/2 Keyboard Interface
http://www.computer-engineering.org/ps2protocol/
The PS/2 Mouse/Keyboard Protocol
http://www.computer-engineering.org/ps2keyboard/scancodes1.html
Keyboard Scan Codes -- Set 1
http://www.computer-engineering.org/ps2keyboard/scancodes2.html
Keyboard Scan Codes -- Set 2
http://www.computer-engineering.org/ps2keyboard/scancodes3.html
Keyboard Scan Codes -- Set 3
http://wiki.osdev.org/PS/2_Keyboard
good short description
http://www.win.tue.nl/~aeb/linux/kbd/scancodes.html
Keyboard scancodes in detail
https://hackaday.com/2016/01/13/stallmans-one-mistake/
See photo in section “Keyboards And Webcams And Hard Drives”.
https://deskthority.net/wiki/TrackPoint
Informative resource on keyboards and pointing devices
Looking for articles by author Adam Chapweske
PS/2 is now considered a legacy port, which continues to be included on many computer motherboards.
PS/2 ports may be favored for security reasons [...] as they allow USB ports to be totally disabled, preventing the connection of [...] malicious USB devices
The PS/2 interface provides no restriction on key rollover.
The PS/2 interface has near-universal compatibility with BIOS.
They cause fewer problems when KVM switching with non-Wintel systems.
The PC 97 standard introduced a color code: the keyboard port, and the plugs on compliant keyboards, were purple; mouse ports and plugs were green.
The pinouts of the connectors (keyboard vs. mouse) are the same, but most computers will not recognize devices connected to the wrong port.
PS/2 ports are designed to connect the digital I/O lines of the microcontroller in the external device directly to the digital lines of the microcontroller on the motherboard. They are not designed to be hot swappable.
Standard PS/2 mice send interrupts at a default rate of 100 hertz when they have data to send to the computer.
PS/2 allows the sample rate to be overridden, with PS/2 supporting a sampling rate of up to 200 Hertz.
Function | 6-pin DIN (PS/2) | 5-pin DIN (AT/XT) | 6-pin SDL
-------- | ---------------- | ----------------- | ---------
+5V | 4 | 5 | E
DATA | 1 | 2 | B
not connected | 2, 6 | 3 | A, F
GND | 3 | 4 | C
CLK | 5 | 1 | D
>
> Socket: Plug:
> 6 _ 5 5 _ 6
> o | | o · | | ·
> |_| |_|
> o o · ·
> 4 3 3 4
> o o · ·
> 2 1 1 2
>
>
> Socket: Plug:
> _ _ _ _
> \_/ \_/
>
> 3 1 1 3
> o o · ·
> 5 4 4 5
> o 2 o · 2 ·
> o ·
>
>
> Socket: Plug:
>
>
> xxxxxxxxxxxxxxx xxxxxxxxxxxxxxx
> | | | | | | | | | | | |
> F E D B C A A B C D E F
>
>
Mainboards and ThinkPad docking stations often carry a so called PS/2 Combi Port, with keyboard and mouse icons at the outlet. The exact wiring is unknown to the author, three options should be taken into account. Each option would require different usage of a dedicated Y-Splitter-Cable.
Combi Port is a PS/2-Keyboard Port with extra clock and data lines for mouse at pins 6 and 2.
Combi Port is a PS/2-Mouse Port with extra clock and data lines for keyboard at pins 6 and 2.
Combi Port is a standard PS/2 port (pins 6 and 2 not connected) which is able to detect the type of device at boot time. Using both devices (keyboard and mouse) simultaneously is not supported.
Port types 1.) and 2.) would require to use a Y-Splitter-Cable (see Figure A) for simultaneous operation of keyboard and mouse. Port type 2.) would additionally require to twist the plugs, thus using the mouse with the keyboard plug and vice-versa.
>
> Figure A: PS/2 Y-Splitter-Cable
> ===============================
>
> 6-pin Mini-DIN 6-pin Mini-DIN 6-pin Mini-DIN
> (PS/2 Combi Port) (PS/2-Keyboard) (PS/2-Mouse)
>
> 1 -------------------------- 1
> 2 --------------------------------------------------------1
> 3 -------------------------- 3 -------------------------- 3
> 4 -------------------------- 4 -------------------------- 4
> 5 -------------------------- 5
> 6 --------------------------------------------------------5
>
>
Note the different layout of a Y-Splitter-Cable which allows for simultaneous usage of keyboard-like devices:
>
> Figure B: PS/2 Y-Splitter-Cable
> ===============================
>
> 6-pin Mini-DIN 6-pin Mini-DIN 6-pin Mini-DIN
> (PS/2 Keyboard Port) (PS/2 Keyboard) (PS/2 Barcode Scanner)
>
> 1 -------------------------- 1 -------------------------- 1
> 3 -------------------------- 3 -------------------------- 3
> 4 -------------------------- 4 -------------------------- 4
> 5 -------------------------- 5 -------------------------- 5
>
>
Coreboot seems to not support PS/2 hardware in first place. Documentation about PS/2 is often lacking details on coreboot’s board status pages. i.e.:
Exact lists about which hardware works how has to be gathered individually and would be a required source of information.
ThinkPad X200 Keyboard Disassembled (Mechanics of one Key Missing)
Original Layout: DE
Seems to have 8 rows and 15 columns of keys:
However, the corresponding X200 sysboard schematics depicts a matrix of 8 rows and 16 columns.
No internal keyboard controller in use.
Foil connector pads in total: 40 (see photo)
Double layer connector cable, schematic needed!
simple flat connector pads to keyboard: 40
splits towards... (see photo)
Sysboard Plug “JAE CONN40A-1-U1GP”
Similar, but wrong JAE Connectors:
and trackpoint board (6x signal, 2x power)
note cable is covered with self-adhesive thick aluminium foil when mounted
integrated trackpoint hardware
soldered towards flat-cable with eight pads
Trackpoint controller is PTPM754DR 32-pin SSOP, no datasheet available. To get some ideas, please refer to:
visible markings:
additional chip (Quad OpAmp):
Keyboard Cable, splits towards Systemboard and Trackpoint
Systemboard Connector, unknown Type
Schematic of an X200 Keyboard Cable with 32-pin PTPM754DR TrackPoint Controller
As visible from the x200 keyboard cable schematics, the keyboard foil pads are organized in...
...resulting in 36 active pads.
Double Layer with integrated Vias
Keyboard Connector Pads, Top and Bottom
Please read PS/2 to get prepared for PS/2 basics.
The trackpoint board is connected to the keyboard cable by eight soldered pads, referenced by names Pad-1..Pad-8 within this documentation. Pad-1 is located close to the board’s edge.
Pad Number | Function | Remarks | 9-pin Sub-D Test Plug
---------- | -------- | ------- | ---------------------
1 | CLK | close to board’s edge | 9
2 | RST | can be connected to positive POR, alternatively | 4
3 | MIDDLE BUTTON | - | 8
4 | RIGHT BUTTON | - | 3
5 | LEFT BUTTON | - | 7
6 | DATA | - | 2
7 | VSS (GND) | connected to thicker route in keyboard cable | 6
8 | VCC (+5V) | connected to thicker, edgemost route of keyboard cable | 1
- | - | - | 5
>
> Alternative POR at RST (Pad 2)
> ==============================
>
> C
> VCC --------||------+
> 2.2µF |
> | R
> RST ----------------+------/\/\/------- GND
> 100K
>
The Keyboard Cable has been modified to ease experimenting with the disassembled Trackpoint Board. Test Connector is a SUB-D9 male plug.
Modified Keyboard Cable to Ease Experimenting
Controller in use is the TPM754 from Philips Semiconductors. This is a 8051-based machine which runs proprietary code from IBM:
“IBM has licensed Philips Semiconductors to sell microcontrollers with TrackPoint code. By purchasing a TPM from Philips, the purchaser becomes a sub-licensee of Philips. The selling price of Philips’ TPM includes the royalties for IBM’s intellectual property, which Philips in turn pays to IBM. Customers for TPMs do not need to sign any licensing agreement with either IBM or Philips. This code is the intellectual property of IBM, which is covered by numerous patents, and must be treated accordingly.” --- Philips Semiconductors TPM754 Datasheet
The TPM754 comes in different packages with different ordering codes. Unfortunately there is no datasheet nor pinout available for the 32-pin SSOP package (ordering code PTPM754DR), but in regard to measurements and the 28-pin SSOP datasheet, the pinout can be guessed in a straight foreward approach.
Pin | Function | Connected Board Pad | External PS/2 Mouse (6-pin Mini-DIN)
--- | -------- | ------------------- | ------------------------------------
1 | RxD/T0/P3.4 | - | Pin 1 (DATA)
2 | TxD/T1/P3.5 | Pad 1 (CLK), close to edge | -
3 | ECI/P3.6 | - | -
4 | INT1/P3.7 | - | Pin 5 (CLK)
5 | RST | Pad 2 (RST) | -
6 | X2 | - | -
7 | X1 | - | -
8 | VSS | Pad 7 (GND) | Pin 3 (GND)
9 | ZIN | - | -
10 | YIN | - | -
11 | XIN | - | -
12 | XYZRAMP | - | -
13 | AVSS | - | -
14 | AVCC | - | -
15 | not connected | - | -
16 | not connected | - | -
17 | VCC? AVCC? | - | -
18 | not connected | - | -
19 | DECOUPLE | - | -
20 | VREG | - | -
21 | XYDACBIAS | - | -
22 | XYSOURCE | - | -
23 | ZDAC/ASEL | - | -
24 | XYDAC | - | -
25 | P1.2 | - | -
26 | VCC | Pad 8 (VCC) | Pin 4 (VCC)
27 | CEX/P1.1 | - | -
28 | INT0/P1.0 | Pad 6 (DATA) | -
29 | P3.0 | Pad 5 (LEFT BUTTON) | -
30 | P3.1 | Pad 4 (RIGHT BUTTON) | -
31 | P3.2 | Pad 3 (MIDDLE BUTTON) | -
32 | P3.3 | - | -
Warning: If the TrackPoint is replaced by a PS/2-Mouse, interfacing with the sysboard’s H8 controller doesn't work. Probably, H8 and TrackPoint Controller do not talk according to PS/2 standards??
Although no interface is provided to attach an additional external PS/2 Mouse, pins 1 and 4 of the TPM754 can be used as a workaround in conjunction with the VCC and GND power lines. The IBM code separates data streams from Trackpoint and Mouse clearly, so that one device moves the screen pointer without being irritated by the other.
Experimental Setup with External PS/2 Mouse
Connecting the Trackpoint Board
>
> Connect Trackpoint via Test Plug to a Standard PS/2 Mouse Port
> ==============================================================
>
>
> +---------VCC---------------------+--------> to Pin 4
> | +----------------DATA-----------|--------> to Pin 1
> | | |
> | | +------RST-------+---||-----+
> | | | | 2.2uF
> 1|2|3 4|5 |
> \ · · · · · / +--/\/\/---+
> \ · · · · / 100K |
> 6|7 8 9| |
> | | |
> | +-----------CLOCK----------|--------> to Pin 5
> +---------GND--------------------+--------> to Pin 3
>
> Sub-D9 Test Plug ----> PS/2 6-pin Mini-DIN
>
>
This setup has been proved to work with a D945GCLF Intel Desktop Board, running blobless coreboot firmware and the Trisquel7 Operating System. The Trackpoint and its attached external PS/2-Mouse is recognized at the PS/2 Mouse Port along with a PS/2-Keyboard (IBM Model M) attached to the PS/2 Keyboard Port. The reset line of the Trackpoint is simulated by the alternative Power-On-Reset circuit.
Trackpoint with External PS/2-Mouse at Standard PS/2 Mouse Port of a Blobless Coreboot Machine
>
> PS/2-Keyboard Setup using an X200 Keyboard Matrix with Trackpoint and external Mouse
> ====================================================================================
>
>
> ····························································································
> : :
> : +-----------------------------------+ :
> : +-----------------------+ | Board with Free-Design Controller | :
> : | X200 Keyboard |-----GND---/4----------| ================================= | :
> : | ============= | | | :
> : | |=====PB and Hotkey=========discard or translate====+ | :
> : | No controller in use. | |___ | | :
> : | |-----KBDID0----------->| | | | :
> : | * Power Button (PB) |-----KBDID1----------->| ? | | | :
> : | * Fn Hotkey |-----KBDID2----------->|___| | | :
> : | * Matrix 16x8 | | | | :
> : | * 3 Mouse Buttons |-----Matrix 16x8-----------------/24----------+ | | :
> : | * KBDID0..2 Lines | | | | | :
> : | * 4x Ground |---Mouse Button M----->| | /2 | :
> : | = 36 Pads |---Mouse Button R----->| | | | :
> : | |---Mouse Button L----->| | | | :
> : +-----------------------+ | v v | :
> : | +················+ | :
> : | : translate into : | :
> : +-----------------------+ | : PS/2 : | :
> : | TrackPoint Board |<<====+5V, GND===============\\ +················+ | :
> : | ================ | | || ^ | :
> : | |<---Mouse Button M-----| __||___________ | | :
> : | 8051-based controller |<---Mouse Button R-----| | +5V, GND | | | :
> : | (PTPM754DR) runs |<---Mouse Button L-----| |_______________| | | :
> : | proprietary code | | | ^ ^ | | :
> : | from IBM. |<-------Reset----------| | | | | | :
> : | | | /2 /2 /2 /2 | :
> : | * 3x Mouse Buttons | PS/2-Trackpoint | | | | | | :
> : | * PS/2 (clock, data) |<=======clock/data================+ | | | :
> : | * Reset Line | PS/2-Mouse | | | | | | :
> : | * Ground | | | | +-----| | :
> : | * +5V Power | Ext. PS/2 Mouse | v | | | :
> : | * Ext. PS/2 |<======clock/data===========+ | | | :
> : | = 10 Lines | | | | | | :
> : | | | | | | | :
> : +-----------------------+ +----|-----|-----------|------------+ :
> : | | | :
> : PS/2-Keyboard with Trackpoint /4 /4 /4 :
> ························································|·····|···········|·················
> | | |
> +--------Ext. PS/2-Mouse-----------------+ | |
> | | |
> | v v
> | +-----------------------------------------------------+
> v | :| PS/2 | | PS/2 |: |
> +------------------------+ | :| Mouse | | Keyboard |: |
> | External PS/2 Mouse | | :|_______| |__________|: |
> | =================== | | ·····PS/2-Combi-Port?····· |
> | | | |
> | proprietary controller | | Blobfree Coreboot Computer or Laptop |
> | | | ==================================== |
> | * PS/2 | | |
> | = 4 Lines | | * with two PS/2 Ports |
> | | | * or with one PS/2 Combi Port and Y-Splitter-Cable |
> +------------------------+ | |
> | Working Example(s): |
> | |
> | * D945GCLF Desktop Board with Blobless Coreboot |
> | |
In case a desktop board with blobless coreboot is used as host, this PS/2 free-design keyboard would significantly improve the computer user’s situation in respect to freedom and security. Let’s go for prototyping!
Footprints are named according to gEDA/gaf and PCB footprint naming convention.
refdes |device |value |footprint |comment |qty
---- |---- |---- |---- |---- |----
U3 |CRYSTAL |5MHz |CRYSTAL 300 | |1
CONN1 |CONNECTOR_4 | |USB-Type-A-Connector | |1
U4 |24Cxx |24LC256 |DIP8 |This chip is optional. Use socket. |1
D3 |LED |yellow |LED3 | |1
R20 |RESISTOR |10K |ACY600 | |1
D2 |LED |orange |LED3 | |1
U6 |MAX232 |MAX3232CPE+ |DIP16 | |1
J2 |HEADER10 |male |HEADER10_2 | |1
D1 |LED |green |LED3 | |1
C5 |POLARIZED_CAPACITOR |10uF 16V |RCY100P | |1
J3 |HEADER3 |male |JUMPER3 | |1
U2 |7432 |74HC32 |DIP14 | |1
R2 |RESISTOR |22K |ACY600 | |1
U1 |P8X32A | |DIP40 |This chip is precious, use socket. |1
C15 |CAPACITOR |100nF |RCY100 |Blocking Cap for 24LC256. |1
C12,C13 |CAPACITOR |100nF |RCY100 |Blocking Cap for P8X32A. |2
C14 |CAPACITOR |100nF |RCY100 |Blocking Cap for 74HC32. |1
CONN2 |CONNECTOR_4 | |JUMPER4 | |1
D6 |DIODE |1N4007 |ALF500 |We used SY360/1 here. |1
C3 |POLARIZED_CAPACITOR |10uF tantalum |RCY100P | |1
U5,U7 |AMS1117 |3.3V |SOT223 | |2
V1 |THERMISTOR +t GradC |RXEF050 |RCY200 |Also known as "Polyfuse". |1
D5,D7 |LED |red |LED3 | |2
R15,R16,R17,R21,R22 |RESISTOR |220R |ACY600 |Value need not match exactly. |5
C1 |POLARIZED_CAPACITOR |100uF 16V |RCY100P | |1
Z1 |ZENER_DIODE |6V8 @ 1.3W |ALF500 | |1
C10,C2,C4,C6,C7,C8,C9 |CAPACITOR |100nF |RCY100 | |7
Version 1.3, 3 November 2008
Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc. http://fsf.org/
Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
The purpose of this License is to make a manual, textbook, or other functional and useful document "free" in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others.
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The "Invariant Sections" are certain Secondary Sections whose titles are designated, as being those of Invariant Sections, in the notice that says that the Document is released under this License. If a section does not fit the above definition of Secondary then it is not allowed to be designated as Invariant. The Document may contain zero Invariant Sections. If the Document does not identify any Invariant Sections then there are none.
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A "Transparent" copy of the Document means a machine-readable copy, represented in a format whose specification is available to the general public, that is suitable for revising the document straightforwardly with generic text editors or (for images composed of pixels) generic paint programs or (for drawings) some widely available drawing editor, and that is suitable for input to text formatters or for automatic translation to a variety of formats suitable for input to text formatters. A copy made in an otherwise Transparent file format whose markup, or absence of markup, has been arranged to thwart or discourage subsequent modification by readers is not Transparent. An image format is not Transparent if used for any substantial amount of text. A copy that is not "Transparent" is called "Opaque".
Examples of suitable formats for Transparent copies include plain ASCII without markup, Texinfo input format, LaTeX input format, SGML or XML using a publicly available DTD, and standard-conforming simple HTML, PostScript or PDF designed for human modification. Examples of transparent image formats include PNG, XCF and JPG. Opaque formats include proprietary formats that can be read and edited only by proprietary word processors, SGML or XML for which the DTD and/or processing tools are not generally available, and the machine-generated HTML, PostScript or PDF produced by some word processors for output purposes only.
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The Document may include Warranty Disclaimers next to the notice which states that this License applies to the Document. These Warranty Disclaimers are considered to be included by reference in this License, but only as regards disclaiming warranties: any other implication that these Warranty Disclaimers may have is void and has no effect on the meaning of this License.
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If you publish printed copies (or copies in media that commonly have printed covers) of the Document, numbering more than 100, and the Document's license notice requires Cover Texts, you must enclose the copies in covers that carry, clearly and legibly, all these Cover Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on the back cover. Both covers must also clearly and legibly identify you as the publisher of these copies. The front cover must present the full title with all words of the title equally prominent and visible. You may add other material on the covers in addition. Copying with changes limited to the covers, as long as they preserve the title of the Document and satisfy these conditions, can be treated as verbatim copying in other respects.
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It is requested, but not required, that you contact the authors of the Document well before redistributing any large number of copies, to give them a chance to provide you with an updated version of the Document.
You may copy and distribute a Modified Version of the Document under the conditions of sections 2 and 3 above, provided that you release the Modified Version under precisely this License, with the Modified Version filling the role of the Document, thus licensing distribution and modification of the Modified Version to whoever possesses a copy of it. In addition, you must do these things in the Modified Version:
If the Modified Version includes new front-matter sections or appendices that qualify as Secondary Sections and contain no material copied from the Document, you may at your option designate some or all of these sections as invariant. To do this, add their titles to the list of Invariant Sections in the Modified Version's license notice. These titles must be distinct from any other section titles.
You may add a section Entitled "Endorsements", provided it contains nothing but endorsements of your Modified Version by various parties—for example, statements of peer review or that the text has been approved by an organization as the authoritative definition of a standard.
You may add a passage of up to five words as a Front-Cover Text, and a passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the Modified Version. Only one passage of Front-Cover Text and one of Back-Cover Text may be added by (or through arrangements made by) any one entity. If the Document already includes a cover text for the same cover, previously added by you or by arrangement made by the same entity you are acting on behalf of, you may not add another; but you may replace the old one, on explicit permission from the previous publisher that added the old one.
The author(s) and publisher(s) of the Document do not by this License give permission to use their names for publicity for or to assert or imply endorsement of any Modified Version.
You may combine the Document with other documents released under this License, under the terms defined in section 4 above for modified versions, provided that you include in the combination all of the Invariant Sections of all of the original documents, unmodified, and list them all as Invariant Sections of your combined work in its license notice, and that you preserve all their Warranty Disclaimers.
The combined work need only contain one copy of this License, and multiple identical Invariant Sections may be replaced with a single copy. If there are multiple Invariant Sections with the same name but different contents, make the title of each such section unique by adding at the end of it, in parentheses, the name of the original author or publisher of that section if known, or else a unique number. Make the same adjustment to the section titles in the list of Invariant Sections in the license notice of the combined work.
In the combination, you must combine any sections Entitled "History" in the various original documents, forming one section Entitled "History"; likewise combine any sections Entitled "Acknowledgements", and any sections Entitled "Dedications". You must delete all sections Entitled "Endorsements".
You may make a collection consisting of the Document and other documents released under this License, and replace the individual copies of this License in the various documents with a single copy that is included in the collection, provided that you follow the rules of this License for verbatim copying of each of the documents in all other respects.
You may extract a single document from such a collection, and distribute it individually under this License, provided you insert a copy of this License into the extracted document, and follow this License in all other respects regarding verbatim copying of that document.
A compilation of the Document or its derivatives with other separate and independent documents or works, in or on a volume of a storage or distribution medium, is called an "aggregate" if the copyright resulting from the compilation is not used to limit the legal rights of the compilation's users beyond what the individual works permit. When the Document is included in an aggregate, this License does not apply to the other works in the aggregate which are not themselves derivative works of the Document.
If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document's Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form. Otherwise they must appear on printed covers that bracket the whole aggregate.
Translation is considered a kind of modification, so you may distribute translations of the Document under the terms of section 4. Replacing Invariant Sections with translations requires special permission from their copyright holders, but you may include translations of some or all Invariant Sections in addition to the original versions of these Invariant Sections. You may include a translation of this License, and all the license notices in the Document, and any Warranty Disclaimers, provided that you also include the original English version of this License and the original versions of those notices and disclaimers. In case of a disagreement between the translation and the original version of this License or a notice or disclaimer, the original version will prevail.
If a section in the Document is Entitled "Acknowledgements", "Dedications", or "History", the requirement (section 4) to Preserve its Title (section 1) will typically require changing the actual title.
You may not copy, modify, sublicense, or distribute the Document except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense, or distribute it is void, and will automatically terminate your rights under this License.
However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice.
Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, receipt of a copy of some or all of the same material does not give you any rights to use it.
The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See http://www.gnu.org/copyleft/.
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"CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 license published by Creative Commons Corporation, a not-for-profit corporation with a principal place of business in San Francisco, California, as well as future copyleft versions of that license published by that same organization.
"Incorporate" means to publish or republish a Document, in whole or in part, as part of another Document.
An MMC is "eligible for relicensing" if it is licensed under this License, and if all works that were first published under this License somewhere other than this MMC, and subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or invariant sections, and (2) were thus incorporated prior to November 1, 2008.
The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA on the same site at any time before August 1, 2009, provided the MMC is eligible for relicensing.
To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page:
Copyright (C) YEAR YOUR NAME.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU
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If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the "with … Texts." line with this:
with the Invariant Sections being LIST THEIR TITLES, with the
Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation.
If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. http://fsf.org/
Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
The GNU General Public License is a free, copyleft license for software and other kinds of works.
The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.
When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.
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Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the software, and (2) offer you this License giving you legal permission to copy, distribute and/or modify it.
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You may convey verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice; keep intact all notices stating that this License and any non-permissive terms added in accord with section 7 apply to the code; keep intact all notices of the absence of any warranty; and give all recipients a copy of this License along with the Program.
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A patent license is "discriminatory" if it does not include within the scope of its coverage, prohibits the exercise of, or is conditioned on the non-exercise of one or more of the rights that are specifically granted under this License. You may not convey a covered work if you are a party to an arrangement with a third party that is in the business of distributing software, under which you make payment to the third party based on the extent of your activity of conveying the work, and under which the third party grants, to any of the parties who would receive the covered work from you, a discriminatory patent license (a) in connection with copies of the covered work conveyed by you (or copies made from those copies), or (b) primarily for and in connection with specific products or compilations that contain the covered work, unless you entered into that arrangement, or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law.
If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program.
Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such.
The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License "or any later version" applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the GNU General Public License, you may choose any version ever published by the Free Software Foundation.
If the Program specifies that a proxy can decide which future versions of the GNU General Public License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Program.
Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands \show w' and \show c' should show the
appropriate parts of the General Public License. Of course, your
program's commands might be different; for a GUI interface, you would
use an "about box".
You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see http://www.gnu.org/licenses/.
The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read http://www.gnu.org/philosophy/why-not-lgpl.html.