add aux files, copyright-notice

9 years ago · 786f6d898b
parent bca628cce7
commit 786f6d898b
14 changed files with 1388 additions and 8 deletions
--- a/reSID.cpp
+++ b/reSID.cpp
@ -1,4 +1,30 @@
-
+/*
 	Arduino SID
 	Copyright (c) 2015 Frank Bösing
 	This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 	The helix decoder itself as a different license, look at the subdirectories for more info.
 	Diese Bibliothek ist freie Software: Sie können es unter den Bedingungen
 	der GNU General Public License, wie von der Free Software Foundation,
 	Version 3 der Lizenz oder (nach Ihrer Wahl) jeder neueren
 	veröffentlichten Version, weiterverbreiten und/oder modifizieren.
 	Diese Bibliothek wird in der Hoffnung, dass es nützlich sein wird, aber
 	OHNE JEDE GEWÄHRLEISTUNG, bereitgestellt; sogar ohne die implizite
 	Gewährleistung der MARKTFÄHIGKEIT oder EIGNUNG FÜR EINEN BESTIMMTEN ZWECK.
 	Siehe die GNU General Public License für weitere Details.
 	Sie sollten eine Kopie der GNU General Public License zusammen mit diesem
 	Programm erhalten haben. Wenn nicht, siehe <http://www.gnu.org/licenses/>.
 	Der Helixdecoder selbst hat eine eigene Lizenz, bitte für mehr Informationen
 	in den Unterverzeichnissen nachsehen.
 */
 #include "reSID.h"
 #include <AudioStream.h>
--- a/reSID.h
+++ b/reSID.h
@ -1,4 +1,30 @@
-
+/*
 	Arduino SID
 	Copyright (c) 2015 Frank Bösing
 	This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 	The helix decoder itself as a different license, look at the subdirectories for more info.
 	Diese Bibliothek ist freie Software: Sie können es unter den Bedingungen
 	der GNU General Public License, wie von der Free Software Foundation,
 	Version 3 der Lizenz oder (nach Ihrer Wahl) jeder neueren
 	veröffentlichten Version, weiterverbreiten und/oder modifizieren.
 	Diese Bibliothek wird in der Hoffnung, dass es nützlich sein wird, aber
 	OHNE JEDE GEWÄHRLEISTUNG, bereitgestellt; sogar ohne die implizite
 	Gewährleistung der MARKTFÄHIGKEIT oder EIGNUNG FÜR EINEN BESTIMMTEN ZWECK.
 	Siehe die GNU General Public License für weitere Details.
 	Sie sollten eine Kopie der GNU General Public License zusammen mit diesem
 	Programm erhalten haben. Wenn nicht, siehe <http://www.gnu.org/licenses/>.
 	Der Helixdecoder selbst hat eine eigene Lizenz, bitte für mehr Informationen
 	in den Unterverzeichnissen nachsehen.
 */
 #include "sid.h"
 #ifndef play_sid_h_
--- a/reSID/AUTHORS
+++ b/reSID/AUTHORS
@ -0,0 +1,3 @@
 Authors of reSID.
 Dag Lem: Designed and programmed complete emulation engine.
--- a/reSID/COPYING
+++ b/reSID/COPYING
@ -0,0 +1,340 @@
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--- a/reSID/ChangeLog
+++ b/reSID/ChangeLog
@ -0,0 +1,313 @@
 2004-06-11  Dag Lem  <resid@nimrod.no>
 	* Version 0.16 released.
 	* envelope.h (EnvelopeGenerator::clock): Corrected off-by-one
 	error in check for ADSR delay bug in delta_t cycle interface.
 	* filter.cc (Filter::set_chip_model): Initialize filter cutoff
 	mappings before call to set_chip_model.
 	* sid.cc (SID::set_sampling_parameters): Build shifted FIR tables
 	with samples according to the sampling frequency.
 	(SID::clock_resample_interpolate): New function; factorized linear
 	interpolation out from filter convolutions, and made convolutions
 	vectorizable.
 	(SID::clock_resample_fast): New function; single convolution, same
 	accuracy as with interpolation by using more filter tables.
 	(SID::State, SID::read_state, SID::write_state): Read and write
 	rate_counter_period and exponential_counter_period. Read sustain
 	value.
 2003-10-20  Dag Lem  <resid@nimrod.no>
 	* Version 0.15 released.
 	* envelope.h (EnvelopeGenerator): Added public State enum.
 	(EnvelopeGenerator::clock): Rate counter is 15 bits, count
 	rate_period - 1 after wrapping from 0x8000 to 0 in ADSR delay bug.
 	* sid.cc, sid.h (SID::State): Added envelope_state.
 	(SID::State::write_state): Restore register 0x18.
 	(SID::set_sampling_parameters): Scale resampling filter to avoid
 	clipping.
 	(SID::clock_resample): Saturated arithmetics to avoid clipping.
 2002-12-31  Dag Lem  <resid@nimrod.no>
 	* Version 0.14 released.
 	* envelope.h (EnvelopeGenerator::clock): Corrected one cycle error
 	in ADSR delay bug. Only load the exponential counter period at the
 	envelope counter values 255, 93, 54, 26, 14, 6, 0.
 	* filter.cc (Filter::set_chip_model): Call set_w0() and set_Q() to
 	update filter settings.
 	(Filter::set_w0): Limit cutoff frequency for both 1 cycle and
 	delta_t cycle filter.
 	* filter.h (Filter::clock): Mix in external audio input.
 	* sid.cc, sid.h (SID::input): New function; accepts external audio
 	input sample.
 	* spline.h (PointPlotter::operator ()): Clamp negative values to
 	zero.
 	* voice.cc, voice.h: Changed misleading name wave_DC to wave_zero.
 	* wave.h (WaveformGenerator::clock): Corrected bug in check for
 	accumulator bit 19 in noise register shift.
 2002-01-19  Dag Lem  <resid@nimrod.no>
 	* Version 0.13 released.
 	* configure.in: Replaced AC_TRY_COMPILER with AC_TRY_COMPILE,
 	removed AC_PROG_RANLIB.
 	* envelope.h (EnvelopeGenerator::clock): Reset rate_step on state
 	change.
 	* extfilt.cc (ExternalFilter::set_chip_model): New calculation of
 	maximum mixer DC level.
 	* filter.cc (Filter::set_chip_model): Moved calculation of
 	voice_DC to voice.cc, corrected calculation of mixer_DC.
 	* filter.h (Filter::output): Mixer output is not inverted.
 	* sid.cc (SID::set_chip_model): Call voice.set_chip_model instead
 	of voice.wave.set_chip_model.
 	* voice.cc (Voice::Voice): Call set_chip_model.
 	(Voice::set_chip_model): New function; model both waveform D/A
 	converter and envelope multiplying D/A converter DC offsets.
 	* voice.h (Voice::output): Add both waveform D/A converter and
 	envelope multiplying D/A converter DC offsets.
 	* wave.h (WaveformGenerator::output____): Reverted to output
 	minimum wave level when no waveform is selected. The maximum and
 	minimum wave output levels are interchanged in C= Hacking Issue	#20.
 2001-10-20  Dag Lem  <resid@nimrod.no>
 	* Version 0.12 released.
 	* envelope.cc, envelope.h, filter.cc, filter.h, wave.cc, wave.h:
 	Removed bool usage. This avoids unnecessary conversion to 1/0.
 	* filter.cc (Filter::set_chip_model): New function; selects voice
 	and mixer DC offsets and mapping from the FC registers to filter
 	cutoff frequency. The voice and mixer DC offsets for the MOS6581 are
 	calculated from	measurements made by Hársfalvi, Levente in
 	C= Hacking Issue #20.
 	(Filter::Filter): Call set_chip_model.
 	(Filter::f0_6581, Filter::f0_8580): Separate FC mapping tables.
 	(Filter::f0_points_6581, Filter::f0_points_8580): Separate FC mapping
 	points.
 	* extfilt.cc, extfilt.h (ExternalFilter::set_chip_model): New
 	function supporting separate DC correction for MOS6581 and MOS8580.
 	* sid.cc, sid.h (SID::adjust_sampling_frequency): New function for
 	on-the-fly adjustment of sampling frequency.
 	(SID::clock_fast): Corrected sample calculation.
 	(SID::set_chip_model): Set filter chip model.
 	(SID::output): Added audio clipping.
 	(SID::clock, SID::clock_fast, SID::clock_interpolate,
 	SID::clock_resample): Added sample interleaving.
 	* spline.h (interpolate): Generalized to accept repeated points to
 	introduce points of non-differentiability and discontinuity.
 	* wave.h (WaveformGenerator::output____): No selected waveform
 	yields maximum wave output level. This was found by Hársfalvi,
 	Levente in C= Hacking Issue #20.
 	(WaveformGenerator::clock): Optimized for speed (no division).
 2001-03-10  Dag Lem  <resid@nimrod.no>
 	* Version 0.11 released.
 	* configure.in: Disable building of shared library by default.
 	Control inlining with RESID_INLINING (0 or 1) and RESID_INLINE
 	(blank or "inline").
 	* envelope.h, extfilt.h, filter.h, voice.h, wave.h: inline keyword
 	in both function declarations and function definitions.
 	* samp2src.pl: Beautified Perl code.
 	* sid.h, sid.cc: Replaced voice variables with array. Removed
 	filter variables from SID::State.
 	(SID::clock): New audio sample generating interface. Three
 	clocking methods are available; clocking at output sample
 	frequency, clocking at cycle frequency with linear sample
 	interpolation, and clocking at cycle frequency with audio
 	resampling.
 	(SID::clock_fast, SID::clock_interpolate, SID::clock_resample):
 	New functions called by SID::clock.
 	(SID::set_sampling_parameters): New function to set up SID for
 	sample generation. The FIR table used in SID::clock_resample is
 	calculated here.
 	(SID::I0): 0th order modified Bessel function to calculate Kaiser
 	window.
 	* siddefs.h: Control inlining with RESID_INLINING (0 or 1) and
 	RESID_INLINE (blank or "inline"). Added enum sampling_method.
 	* voice.h, voice.cc (Voice::set_sync_source): Moved setting of
 	sync source from constructor.
 	* wave.h, wave.cc (WaveformGenerator::set_sync_source): Moved
 	setting of sync source from constructor.
 2000-11-22  Dag Lem  <resid@nimrod.no>
 	* Version 0.10 released.
 	* configure.in, Makefile.am: Use libtool to build library. The
 	hack to "disable" install is removed.
 	* extfilt.h, filter.h: Moved filter stability code from sid.cc.
 	* sid.cc (SID::clock): Moved filter stability code to
 	extfilt.h/filter.h. Don't clock the rest of the chip more
 	frequently than necessary.
 	* wave.cc: Typecast for pedantic (and probably incorrect)
 	compilers.
 2000-05-18  Dag Lem  <resid@nimrod.no>
 	* Version 0.9 released.
 	* filter.h (Filter::output): The sum of the filter outputs is no
 	longer weighted.
 1999-06-24  Dag Lem  <resid@nimrod.no>
 	* Version 0.8 released.
 	* filter.h, filter.cc, wave.h, wave.cc: Typecasts for pedantic
 	compilers.
 	* filter.h (Filter::clock): Voice 3 is only silenced by voice3off
 	if it is not routed through the filter.
 	* sid.cc (SID::State): Added constructor for proper initalization.
 	* spline.h: Inlined template functions to avoid problems at link
 	time with certain compilers.
 1999-02-25  Dag Lem  <resid@nimrod.no>
 	* Version 0.7 released.
 	* configure.in: Check whether compiler supports bool.
 	* extfilt.h, extfilt.cc: Implementation of C64 filter, external to
 	the SID chip.
 	* filter.h (Filter::clock): Optimized filter routing using a switch.
 	(Filter::output): Optimized filter mixing using a switch, avoiding
 	integer division. Corrected sign of filtered output, which is
 	inverted compared to unfiltered output.
 	* filter.cc (Filter::set_w0): Removed use of M_PI and math.h
 	functions. Use spline table to map fc to w0.
 	(Filter::fc_default): Return array of FC spline interpolation points.
 	(Filter::fc_plotter): Return FC spline plotter object.
 	* sid.h (SID::enable_external_filter): Enable/disable external
 	filter.
 	(SID::fc_default): Return array of FC spline interpolation points.
 	(SID::fc_plotter): Return FC spline plotter object.
 	(SID::State, SID::read_state, SID::write_state): Read and write
 	complete SID state.
 	* sid.cc (SID::clock): Age bus value. Clock external filter.
 	(SID::enable_external_filter): Enable/disable external filter.
 	* spline.h: Spline implementation. Used to specify mapping from
 	the FC register to filter cutoff frequency.
 1998-11-14  Dag Lem  <resid@nimrod.no>
 	* Version 0.6 released.
 	* configure.in: Allow compilation in a separate directory.
 	* wave.h (WaveformGenerator::synchronize): Handle special case when a
 	sync source is synced itself on the same cycle as its MSB is set
 	high.
 	* sid.cc (SID::clock): Only clock on MSB on/off for hard sync.
 1998-09-06  Dag Lem  <resid@nimrod.no>
 	* Version 0.5 released.
 	* version.cc (resid_version_string): Version string with C linkage.
 	* wave.cc (WaveformGenerator::set_chip_model): Emulation of MOS8580
 	combined waveforms.
 1998-08-28  Dag Lem  <resid@nimrod.no>
 	* Version 0.4 released.
 	* envelope.h (EnvelopeGenerator::clock): Count up to rate_period twice
 	during ADSR delay bug, and add one extra rate counter step.
 	* filter.cc (Filter::bsd_copysign): Renamed copysign function for
 	compilation on platforms where copysign is implemented as a macro.
 1998-08-23  Dag Lem  <resid@nimrod.no>
 	* Version 0.3 released.
 	* envelope.h (EnvelopeGenerator::clock): Handle ADSR boundary bug.
 	* envelope.cc (EnvelopeGenerator::rate_counter_period,
 	EnvelopeGenerator::exponential_counter_period): Corrected counter
 	periods.
 	* filter.h (Filter::clock): Optimized for speed (division by shifting).
 	* sid.h (SID::clock): New one-cycle optimized overload of the clock()
 	function.
 	* wave.h (WaveformGenerator::output_P_T): Combined waveform
 	pulse+triangle indexing corrected.
 	(WaveformGenerator::output_P__): Check for test bit to handle
 	pulse+test bit samples.
 	(WaveformGenerator::output): Optimized for speed (inlining).
 1998-07-28  Dag Lem  <resid@nimrod.no>
 	* Version 0.2 released.
 	* envelope.h (EnvelopeGenerator::clock): Start decay cycle immediately
 	at envelope counter 0xff. New sustain value is zero if the sustain
 	level is raised above the current envelope counter value.
 	(EnvelopeGenerator::step_envelope): Handle ADSR delay bug.
 	* envelope.cc (EnvelopeGenerator::rate_counter_period,
 	EnvelopeGenerator::exponential_counter_period): Corrected counter
 	periods.
 	(EnvelopeGenerator::writeCONTROL_REG): Do not modify rate counter.
 	* filter.cc (Filter::set_Q): Constrain Q to keep filter stable.
 	* sid.h (SID::read, SID::write, SID::bypass_filter): Simplified API
 	routing register access through the SID class.
 	* sid.cc (SID::output): Corrected variable-bit audio output return.
 	(SID::read, SID::write): Allow read of write only registers.
 1998-06-09  Dag Lem  <resid@nimrod.no>
 	* Version 0.1 released.
--- a/reSID/INSTALL
+++ b/reSID/INSTALL
@ -0,0 +1,229 @@
 Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002 Free Software
 Foundation, Inc.
   This file is free documentation; the Free Software Foundation gives
 unlimited permission to copy, distribute and modify it.
 Basic Installation
 ==================
   These are generic installation instructions.
   The `configure' shell script attempts to guess correct values for
 various system-dependent variables used during compilation.  It uses
 those values to create a `Makefile' in each directory of the package.
 It may also create one or more `.h' files containing system-dependent
 definitions.  Finally, it creates a shell script `config.status' that
 you can run in the future to recreate the current configuration, and a
 file `config.log' containing compiler output (useful mainly for
 debugging `configure').
   It can also use an optional file (typically called `config.cache'
 and enabled with `--cache-file=config.cache' or simply `-C') that saves
 the results of its tests to speed up reconfiguring.  (Caching is
 disabled by default to prevent problems with accidental use of stale
 cache files.)
   If you need to do unusual things to compile the package, please try
 to figure out how `configure' could check whether to do them, and mail
 diffs or instructions to the address given in the `README' so they can
 be considered for the next release.  If you are using the cache, and at
 some point `config.cache' contains results you don't want to keep, you
 may remove or edit it.
   The file `configure.ac' (or `configure.in') is used to create
 `configure' by a program called `autoconf'.  You only need
 `configure.ac' if you want to change it or regenerate `configure' using
 a newer version of `autoconf'.
 The simplest way to compile this package is:
  1. `cd' to the directory containing the package's source code and type
     `./configure' to configure the package for your system.  If you're
     using `csh' on an old version of System V, you might need to type
     `sh ./configure' instead to prevent `csh' from trying to execute
     `configure' itself.
     Running `configure' takes awhile.  While running, it prints some
     messages telling which features it is checking for.
  2. Type `make' to compile the package.
  3. Optionally, type `make check' to run any self-tests that come with
     the package.
  4. Type `make install' to install the programs and any data files and
     documentation.
  5. You can remove the program binaries and object files from the
     source code directory by typing `make clean'.  To also remove the
     files that `configure' created (so you can compile the package for
     a different kind of computer), type `make distclean'.  There is
     also a `make maintainer-clean' target, but that is intended mainly
     for the package's developers.  If you use it, you may have to get
     all sorts of other programs in order to regenerate files that came
     with the distribution.
 Compilers and Options
 =====================
   Some systems require unusual options for compilation or linking that
 the `configure' script does not know about.  Run `./configure --help'
 for details on some of the pertinent environment variables.
   You can give `configure' initial values for configuration parameters
 by setting variables in the command line or in the environment.  Here
 is an example:
     ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix
   *Note Defining Variables::, for more details.
 Compiling For Multiple Architectures
 ====================================
   You can compile the package for more than one kind of computer at the
 same time, by placing the object files for each architecture in their
 own directory.  To do this, you must use a version of `make' that
 supports the `VPATH' variable, such as GNU `make'.  `cd' to the
 directory where you want the object files and executables to go and run
 the `configure' script.  `configure' automatically checks for the
 source code in the directory that `configure' is in and in `..'.
   If you have to use a `make' that does not support the `VPATH'
 variable, you have to compile the package for one architecture at a
 time in the source code directory.  After you have installed the
 package for one architecture, use `make distclean' before reconfiguring
 for another architecture.
 Installation Names
 ==================
   By default, `make install' will install the package's files in
 `/usr/local/bin', `/usr/local/man', etc.  You can specify an
 installation prefix other than `/usr/local' by giving `configure' the
 option `--prefix=PATH'.
   You can specify separate installation prefixes for
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 give `configure' the option `--exec-prefix=PATH', the package will use
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 Documentation and other data files will still use the regular prefix.
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 options like `--bindir=PATH' to specify different values for particular
 kinds of files.  Run `configure --help' for a list of the directories
 you can set and what kinds of files go in them.
   If the package supports it, you can cause programs to be installed
 with an extra prefix or suffix on their names by giving `configure' the
 option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
 Optional Features
 =================
   Some packages pay attention to `--enable-FEATURE' options to
 `configure', where FEATURE indicates an optional part of the package.
 They may also pay attention to `--with-PACKAGE' options, where PACKAGE
 is something like `gnu-as' or `x' (for the X Window System).  The
 `README' should mention any `--enable-' and `--with-' options that the
 package recognizes.
   For packages that use the X Window System, `configure' can usually
 find the X include and library files automatically, but if it doesn't,
 you can use the `configure' options `--x-includes=DIR' and
 `--x-libraries=DIR' to specify their locations.
 Specifying the System Type
 ==========================
   There may be some features `configure' cannot figure out
 automatically, but needs to determine by the type of machine the package
 will run on.  Usually, assuming the package is built to be run on the
 _same_ architectures, `configure' can figure that out, but if it prints
 a message saying it cannot guess the machine type, give it the
 `--build=TYPE' option.  TYPE can either be a short name for the system
 type, such as `sun4', or a canonical name which has the form:
     CPU-COMPANY-SYSTEM
 where SYSTEM can have one of these forms:
     OS KERNEL-OS
   See the file `config.sub' for the possible values of each field.  If
 `config.sub' isn't included in this package, then this package doesn't
 need to know the machine type.
   If you are _building_ compiler tools for cross-compiling, you should
 use the `--target=TYPE' option to select the type of system they will
 produce code for.
   If you want to _use_ a cross compiler, that generates code for a
 platform different from the build platform, you should specify the
 "host" platform (i.e., that on which the generated programs will
 eventually be run) with `--host=TYPE'.
 Sharing Defaults
 ================
   If you want to set default values for `configure' scripts to share,
 you can create a site shell script called `config.site' that gives
 default values for variables like `CC', `cache_file', and `prefix'.
 `configure' looks for `PREFIX/share/config.site' if it exists, then
 `PREFIX/etc/config.site' if it exists.  Or, you can set the
 `CONFIG_SITE' environment variable to the location of the site script.
 A warning: not all `configure' scripts look for a site script.
 Defining Variables
 ==================
   Variables not defined in a site shell script can be set in the
 environment passed to `configure'.  However, some packages may run
 configure again during the build, and the customized values of these
 variables may be lost.  In order to avoid this problem, you should set
 them in the `configure' command line, using `VAR=value'.  For example:
     ./configure CC=/usr/local2/bin/gcc
 will cause the specified gcc to be used as the C compiler (unless it is
 overridden in the site shell script).
 `configure' Invocation
 ======================
   `configure' recognizes the following options to control how it
 operates.
 `--help'
 `-h'
     Print a summary of the options to `configure', and exit.
 `--version'
 `-V'
     Print the version of Autoconf used to generate the `configure'
     script, and exit.
 `--cache-file=FILE'
     Enable the cache: use and save the results of the tests in FILE,
     traditionally `config.cache'.  FILE defaults to `/dev/null' to
     disable caching.
 `--config-cache'
 `-C'
     Alias for `--cache-file=config.cache'.
 `--quiet'
 `--silent'
 `-q'
     Do not print messages saying which checks are being made.  To
     suppress all normal output, redirect it to `/dev/null' (any error
     messages will still be shown).
 `--srcdir=DIR'
     Look for the package's source code in directory DIR.  Usually
     `configure' can determine that directory automatically.
 `configure' also accepts some other, not widely useful, options.  Run
 `configure --help' for more details.
--- a/reSID/NEWS
+++ b/reSID/NEWS
@ -0,0 +1,271 @@
 Changes in reSID version 0.16
 -----------------------------
 An off-by-one error in the emulation of the ADSR delay bug has been
 fixed in the fast version of the envelope clocking.
 An initialization bug in the Filter class which caused floating point
 exceptions on some platforms has been fixed.
 Missing fields have been added to SID::State for correct snapshots.
 By building shifted FIR tables with samples according to the sampling
 frequency, the resampling code dramatically reduces the computational
 effort in the filter convolutions, without any loss of accuracy. The
 filter convolutions are now also vectorizable on current hardware. The
 implementation builds on ideas by Laurent Ganier.
 The resampling code has been split into two functions, one using
 interpolation and a small set of shifted filter tables, and one using
 direct lookup and a large set of shifted filter tables. The accuracy
 is the same, the difference is that the direct lookup runs has the
 potential of running at almost twice the speed (depending on cache
 size and memory bandwidth) using approximately 16MB more memory. It is
 now possible to run high quality resampling in real time on quite
 modest hardware, provided that a vectorizing compiler is used.
 Changes in reSID version 0.15
 -----------------------------
 An error in the emulation of the ADSR delay bug has been fixed. When
 emulation of the ADSR delay bug was introduced in reSID 0.2, the delay
 was one cycle too long. One cycle was subtracted from the delay in
 reSID 0.4, however unfortunately one rate counter period was added as
 well, thus increasing the error. At the time there was no method to
 fully synchronize the CPU with envelope 3, so the measurements relied
 on averaging. Because of pipelining in the envelope logic the effects
 of a write are delayed, and this caused the test code to miss the
 target by exactly one rate counter period on a real SID. The current
 test code does achieve full synchronization with envelope 3, so this
 time the delay should be 100% correct. There are still side effects
 caused by pipelining which are not implemented in reSID, however these
 effects are not controllable without full synchronization with the
 envelope, something which is hard to achieve with envelope 3, and
 impossible with envelope 1 and 2.
 The envelope state (ADSR) has been added to the SID state, and the
 volume setting is now restored from the SID state.
 Filter scaling and clipping has been added to avoid sample overflows
 in the resampling filter.
 Changes in reSID version 0.14
 -----------------------------
 The SID external audio input is now emulated. This can be used e.g. to
 simulate the hack of connecting a resistor from EXT IN to GND to boost
 the sample volume on the MOS8580. Calling sid.input(-32768) makes the
 MOS8580 sound more or less like the MOS6581 with respect to samples.
 The interface could also be used to mix in an external audio signal,
 but note that to do this correctly you should really resample the
 audio signal to 1MHz first.
 The filter settings are now updated immediately when the chip model is
 changed. Earlier the filter cutoff frequency would not change until
 the FC registers were updated.
 A one cycle error in the fast version of the envelope clocking has
 been fixed. This bug was introduced in reSID 0.13 and could affect the
 ADSR delay emulation.
 The exponential counter period is now only loaded at the envelope
 counter values 255, 93, 54, 26, 14, 6, 0. The period can be different
 for the same envelope counter value, depending on whether the envelope
 has been rising (attack -> release) or sinking (decay/release).
 A bug in the fast version of the noise register shift routine has been
 corrected. This bug caused too low noise frequency in some cases.
 The filter cutoff frequency is limited to 16kHz to keep the filter stable.
 Changes in reSID version 0.13
 -----------------------------
 The internal DC levels of the MOS6581 have been double checked and
 corrected. The reason for the asymmetric scaling of the voice output
 has been found; there is a DC offset from the waveform D/A converter
 in addition to the DC offset from the envelope multiplying D/A
 converter. No selected waveform (N=P=S=T=0) yields minimum wave output
 level again.
 A bug in the fast version of the envelope clocking has been corrected.
 This bug could incorrectly invoke the ADSR delay emulation.
 Changes in reSID version 0.12
 -----------------------------
 A bug causing incorrect sample spacing in the new SAMPLE_FAST sample
 calculation has been corrected.
 Audio clipping has been added to guard against sample overflows.
 To support multi-channel sampling, sample interleaving has been added
 to the clock() interface.
 To support synchronization with an external timer, an interface for
 sample rate adjustment has been added.
 The internal DC levels have been corrected. No selected waveform
 (N=P=S=T=0) yields maximum wave output level. Furthermore, each voice
 in the MOS6581 independently contributes to the DC level in the mixer,
 and the mixer itself has a small DC offset as well. The MOS8580 has no
 DC offsets.
 The spline interpolation routine has been generalized to accept
 repeated points to introduce points of non-differentiability and
 discontinuity.
 A separate mapping from the FC registers to filter cutoff frequency
 has been included for the MOS8580, and the mapping for the MOS6581 has
 been refined.
 Changes in reSID version 0.11
 -----------------------------
 A new clock() interface has been added. This function generates audio
 samples into a buffer, greatly simplifying the task of writing driver
 code for reSID. It also facilitates more advanced audio sample
 generation, as described below.
 Three clocking methods are available: clocking at output sample
 frequency, clocking at cycle frequency with linear sample
 interpolation, and clocking at cycle frequency with audio resampling.
 Clocking at output sample frequency is fast, and yields acceptable
 sound quality, except for the SID combined waveforms, which have a
 very high frequency content.
 Clocking at cycle frequency with linear sample interpolation is
 approximately five to ten times slower at 44.1kHz sampling frequency,
 but the sound quality is improved because of the linear sample
 interpolation, and because some sampling noise is removed by the SID
 external filter, which attenuates signals above 16kHz.
 Finally, clocking at cycle frequency with audio resampling has a work
 rate which is independent of the sampling frequency; it is rather
 inversely proportional to the percentage of the bandwidth allocated
 to the filter transition band. This implies that e.g. with the
 transition band starting at ~ 20kHz, it is faster to generate 48kHz
 than 44.1kHz samples.
 Audio resampling is the theoretically correct method for sample
 generation, and delivers SID sound quality previously unheard of. This
 should make connoisseurs nod in appreciation, and for some time to
 come it could possibly also make people tear their hair over having to
 buy state of the art hardware to handle the obscene workload in real
 time. By trading off passband bandwidth for speed, real time
 processing is possible on current hardware. A 60% passband bandwidth
 is within the reach of reasonably fast machines, while maximum sound
 quality at 90% passband bandwidth, requiring four times the processing
 power, is not. Yet.
 Changes in reSID version 0.10
 -----------------------------
 Libtool is now used to build the library.
 To keep the filters stable it is necessary to clock them at above
 sample rate. The chip clocking code has been modified to only
 "overclock" the filters, not the whole chip. This yields a
 considerable speedup without noticeably lowering sound quality. Note
 that this is aimed at slow hardware, if possible the 1 cycle clock
 interface should be used to eliminate sampling noise.
 Changes in reSID version 0.9
 ----------------------------
 The sum of the filter outputs is no longer weighted.
 Changes in reSID version 0.8
 ----------------------------
 voice3off has no effect if voice 3 is routed through the filter.
 Changes in reSID version 0.7
 ----------------------------
 The audio output filter in the C64, external to the SID chip, has been
 modeled.
 The mapping function between the FC register and filter cutoff frequency can
 now be specified with spline interpolation points. This facilitates
 interactive modification of the mapping function by graphical presentation of
 the interpolation curve. The implementation of this novel spline design is
 fast and general purpose, and should be well suited for use in other projects
 as well.
 Filtered output has been inverted compared to unfiltered output.
 Aging of the bus value obtained when reading write only registers has been
 partly implemented.
 To facilitate offline storage the complete state of SID can be read and
 written.
 Changes in reSID version 0.6
 ----------------------------
 A special case in synchronization has been implemented.
 The Autoconf script is cleaned up to allow compilation in a separate directory.
 Changes in reSID version 0.5
 ----------------------------
 Emulation of MOS8580 combined waveforms.
 Version string resid_version_string provided for e.g. Autoconf tests.
 The string has C linkage.
 Changes in reSID version 0.4
 ----------------------------
 The implementation of the ADSR delay bug has been refined and should now be
 cycle exact.
 The patch for VICE has been removed since VICE 0.15 will include reSID support.
 Changes in reSID version 0.3
 ----------------------------
 The reSID library has changed name from libmos6581.a to libresid.a
 The pulse+sawtooth combined waveform has been corrected.
 Pulse+test bit samples are implemented.
 The envelope rate periods have finally been exactly determined.
 A new SID bug, the ADSR boundary bug, has been discovered and implemented.
 This bug makes it possible to step from envelope level 0x00 to 0xff or from
 0xff to 0x00 in one step.
 One-cycle optimized overloads of the clock() functions have been implemented
 to facilitate sampling at 1MHz.
 The code has been further optimized for speed.
 Changes in reSID version 0.2
 ----------------------------
 The implementation of the Envelope Generator has been rewritten to handle
 the infamous ADSR delay bug. All known envelope related bugs have been
 corrected.
 The maximum filter resonance is lowered to keep the filter stable.
 The reSID API has been simplified. Reading write only registers is allowed.
--- a/reSID/README
+++ b/reSID/README
@ -0,0 +1,26 @@
 This is reSID, a reverse engineered software emulation of the MOS6581 SID
 (Sound Interface Device). This chip was used in the Commodore 64 computer.
 reSID is free software. See the file COPYING for copying permission.
 reSID is a C++ library containing a complete emulation of the SID chip.
 This library can be linked into programs emulating the MOS6510 MPU to
 play music made for the Commodore 64 computer. reSID has been successfully
 linked into VICE, a full-fledged Commodore 64 emulator, and SIDPLAY, a
 popular SID tune player. The VICE home page is:
 http://www.viceteam.org/
 A patch for SIDPLAY can be found on the SIDPLAY home page:
 http://www.geocities.com/SiliconValley/Lakes/5147/
 Various SID emulators exist, however reSID should still be of great
 interest to Commodore 64 nostalgics. The emulator engine is cycle-based,
 emulating the internal operations of the SID chip. SID's audio filter is
 modeled as an actual two-integrator-loop biquadratic filter circuit.
 The engine has been developed based on available information on SID, sampling
 of the OSC3 and ENV3 registers, filter theory, and meticulous testing.
 In short, a scientific approach has been taken to model the SID chip as
 accurately as possible.
 To our knowledge reSID is by far the most accurate SID emulator ever created.
 This comes at a price; what is considered a fairly fast CPU at the time of
 this writing is needed to run the emulator.
--- a/reSID/THANKS
+++ b/reSID/THANKS
@ -0,0 +1,87 @@
 reSID was written by Dag Lem.
 The project was started after reading an interview with Bob Yannes, the
 head engineer of the SID chip. This interview was made by Andreas Varga,
 with additional questions from Linus Walleij. The interview can be found on
 the SID Homepage:
 http://stud1.tuwien.ac.at/~e9426444/sidpage.html
 The reverse engineering of the SID chip would not have been possible without
 this interview.
 Also found on the SID Homepage is an examination of the SID noise waveform
 written by Asger Alstrup. This article was of great help in reverse
 engineering the complete algorithm for the noise waveform.
 Lars Haugseth has been invaluable in the testing of reSID.
 In a matter of hours after hearing about my project, he had completed a 6510
 disassembler in Perl. The importance of this was not evident to me until the
 next day when he had disassembled the music routine for "Outrun Remix" by
 Geir Tjelta, made some changes to it, reassembled, and produced a file
 containing 48K of SID register values.
 The first tests of reSID were run on this file.
 With an exceptional memory of Commodore 64 tunes Lars Haugseth has pointed
 out several errors in reSID that are now corrected.
 Morten Rollan and Kåre Gunnar Nesheim have provided interesting and insightful
 information regarding digital filters. Kåre Gunnar Nesheim has also kindly
 provided a 1901 monitor and a C64C from his private computer museum. His C64C
 was used to measure the MOS8580 filter cutoff characteristics.
 VICE has been an inspiration for this project, and testing of reSID has
 been greatly simplified by VICEs -sounddev dump option. Teemu Rantanen
 has written support for reSID in VICE, making it possible to choose at runtime
 between his excellent SID emulation and, given enough CPU power, the reSID
 emulator engine. Tibor Biczo, Andreas Boose, and André Fachat have provided
 combined waveform samples for 6581 R1, R3, R4, and 8580 R5 SID chips.
 The VICE home page is found at:
 http://www.viceteam.org/
 The author of SIDPLAY, Michael Schwendt, has implemented a patch to link
 libsidplay with reSID. Using his excellent tune player he has pointed out
 several bugs in reSID. He has also provided invaluable information related to
 the bugs as basis for further investigation. Most notably, the infamous ADSR
 delay bug, of which I was previously unaware, has finally been understood and
 is now correctly implemented in reSID. The SIDPLAY home page is found at:
 http://www.geocities.com/SiliconValley/Lakes/5147/
 A bug report from Daniel Lacasse led to the discovery of a previously unknown
 SID bug, the ADSR boundary bug.
 Anders Ødegård has explained aspects of analog electronics and audio
 equipment.
 Bob Yannes has patiently answered questions and has provided lots of
 technical information on the SID filter. Thank you Bob!
 Julius O. Smith III has provided much of the theoretical basis for the
 audio resampling with his "Digital Audio Resampling Home Page":
 http://www-ccrma.stanford.edu/~jos/resample/
 Hársfalvi, Levente has made a thorough investigation of the DC levels
 in the MOS6581 chip. His results are available in C= Hacking Issue #20,
 and form the basis of DC corrections in reSID. Levente found that each
 voice independently contributes to the DC level in the mixer. Note
 that some of the conclusions in the article are incorrect, as the
 maximum and minimum voice output levels are interchanged.
 The author of SIDPLAY2, Simon White, has given a lot of feedback on
 reSID. Most importantly he found and fixed a bug in the fast clock
 version of the ADSR emulation.
 Laurent Ovaert found and fixed a bug in the fast version of the noise
 register shift routine.
 Andreas Dehmel has reported all sorts of initialization and overflow
 errors.
 Laurent Ganier demonstrated two crucial techniques for vectorizable
 filter convolution in a patch. Firstly, he made the filter elements
 correspond to the sampling frequency, allowing the linear
 interpolation to be factorized out from the convolution. Secondly, he
 duplicated elements in the sample ring buffer, achieving contiguous
 storage of the samples. The current resampling implementation builds
 on these ideas, improving on them by using shifted filter tables for
 generalization and accuracy.
 Finally I would like to thank my business partner Stian W. Arnesen for
 putting up with all this nonsense.
--- a/reSID/TODO
+++ b/reSID/TODO
@ -0,0 +1,8 @@
 * Determine the characteristics of the SID filter integrators. Spice
  may perhaps be used to simulate the filter circuit.
 * Write documentation. Possibly a paper describing how SID was reverse
  engineered.
 * Implement a SID tune player. A PSID player, VSID, is partly
  implemented in VICE.
--- a/reSID/filter.cc
+++ b/reSID/filter.cc
@ -228,7 +228,7 @@ void Filter::writeFC_LO(reg8 fc_lo)
 void Filter::writeFC_HI(reg8 fc_hi)
 {
-  fc = ((fc_hi << 3) & 0x7f8) | (fc & 0x007);
+  fc = (((unsigned int)fc_hi << 3) & 0x7f8) | (fc & 0x007);
  set_w0();
 }
--- a/reSID/wave.cc
+++ b/reSID/wave.cc
@ -76,7 +76,7 @@ void WaveformGenerator::writeFREQ_LO(reg8 freq_lo)
 void WaveformGenerator::writeFREQ_HI(reg8 freq_hi)
 {
-  freq = ((freq_hi << 8) & 0xff00) | (freq & 0x00ff);
+  freq = (((unsigned int) freq_hi << 8) & 0xff00) | (freq & 0x00ff);
 }
 void WaveformGenerator::writePW_LO(reg8 pw_lo)
@ -86,7 +86,7 @@ void WaveformGenerator::writePW_LO(reg8 pw_lo)
 void WaveformGenerator::writePW_HI(reg8 pw_hi)
 {
-  pw = ((pw_hi << 8) & 0xf00) | (pw & 0x0ff);
+  pw = (((unsigned int)pw_hi << 8) & 0xf00) | (pw & 0x0ff);
 }
 void WaveformGenerator::writeCONTROL_REG(reg8 control)
--- a/sid.cpp
+++ b/sid.cpp
@ -1,5 +1,30 @@
-
+/*
-
+	Arduino SID
 	Copyright (c) 2015 Frank Bösing
 	This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 	The helix decoder itself as a different license, look at the subdirectories for more info.
 	Diese Bibliothek ist freie Software: Sie können es unter den Bedingungen
 	der GNU General Public License, wie von der Free Software Foundation,
 	Version 3 der Lizenz oder (nach Ihrer Wahl) jeder neueren
 	veröffentlichten Version, weiterverbreiten und/oder modifizieren.
 	Diese Bibliothek wird in der Hoffnung, dass es nützlich sein wird, aber
 	OHNE JEDE GEWÄHRLEISTUNG, bereitgestellt; sogar ohne die implizite
 	Gewährleistung der MARKTFÄHIGKEIT oder EIGNUNG FÜR EINEN BESTIMMTEN ZWECK.
 	Siehe die GNU General Public License für weitere Details.
 	Sie sollten eine Kopie der GNU General Public License zusammen mit diesem
 	Programm erhalten haben. Wenn nicht, siehe <http://www.gnu.org/licenses/>.
 	Der Helixdecoder selbst hat eine eigene Lizenz, bitte für mehr Informationen
 	in den Unterverzeichnissen nachsehen.
 */
 #include "reSID/envelope.cc"
 #include "reSID/extfilt.cc"
--- a/sid.h
+++ b/sid.h
@ -1,4 +1,30 @@
-
+/*
 	Arduino SID
 	Copyright (c) 2015 Frank Bösing
 	This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 	The helix decoder itself as a different license, look at the subdirectories for more info.
 	Diese Bibliothek ist freie Software: Sie können es unter den Bedingungen
 	der GNU General Public License, wie von der Free Software Foundation,
 	Version 3 der Lizenz oder (nach Ihrer Wahl) jeder neueren
 	veröffentlichten Version, weiterverbreiten und/oder modifizieren.
 	Diese Bibliothek wird in der Hoffnung, dass es nützlich sein wird, aber
 	OHNE JEDE GEWÄHRLEISTUNG, bereitgestellt; sogar ohne die implizite
 	Gewährleistung der MARKTFÄHIGKEIT oder EIGNUNG FÜR EINEN BESTIMMTEN ZWECK.
 	Siehe die GNU General Public License für weitere Details.
 	Sie sollten eine Kopie der GNU General Public License zusammen mit diesem
 	Programm erhalten haben. Wenn nicht, siehe <http://www.gnu.org/licenses/>.
 	Der Helixdecoder selbst hat eine eigene Lizenz, bitte für mehr Informationen
 	in den Unterverzeichnissen nachsehen.
 */
 #include "reSID/sid.h"
		`@ -0,0 +1,3 @@`
							`Authors of reSID.`

							`Dag Lem: Designed and programmed complete emulation engine.`