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add aux files, copyright-notice

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Frank Bösing 9 years ago
parent bca628cce7
commit 786f6d898b
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  1. 28
      reSID.cpp
  2. 28
      reSID.h
  3. 3
      reSID/AUTHORS
  4. 340
      reSID/COPYING
  5. 313
      reSID/ChangeLog
  6. 229
      reSID/INSTALL
  7. 271
      reSID/NEWS
  8. 26
      reSID/README
  9. 87
      reSID/THANKS
  10. 8
      reSID/TODO
  11. 2
      reSID/filter.cc
  12. 4
      reSID/wave.cc
  13. 29
      sid.cpp
  14. 28
      sid.h

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reSID.cpp
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/*
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>

28
reSID.h
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/*
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_

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reSID/AUTHORS
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Authors of reSID.
Dag Lem: Designed and programmed complete emulation engine.

340
reSID/COPYING
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GNU GENERAL PUBLIC LICENSE
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313
reSID/ChangeLog
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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.

229
reSID/INSTALL
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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
architecture-specific files and architecture-independent files. If you
give `configure' the option `--exec-prefix=PATH', the package will use
PATH as the prefix for installing programs and libraries.
Documentation and other data files will still use the regular prefix.
In addition, if you use an unusual directory layout you can give
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.

271
reSID/NEWS
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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.

26
reSID/README
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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.

87
reSID/THANKS
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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.

8
reSID/TODO
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* 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.

2
reSID/filter.cc
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@ -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();
}

4
reSID/wave.cc
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@ -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)

29
sid.cpp
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/*
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"

28
sid.h
Unescape View File

@ -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"

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