search

6809 / MC6809

Implementation of the MC6809 CPU in Python (Extracted from https://github.com/jedie/DragonPy project)
GNU General Public License v3.0
32 stars 6 forks source link
cpu emulator mc6809 python

readme

MC6809 CPU emulator written in Python

MC6809 is a Open source (GPL v3 or later) emulator for the legendary 6809 CPU, used old homecomputer Dragon 32/64 and Tandy TRS-80 Color Computer (CoCo) built in the 1980s...

Tested with Python 3.8, 3.9, 3.10 and PyPy3

tests codecov MC6809 @ PyPi Python Versions License GPL-3.0-or-later

A example usage can be find in: MC6809/example6809.py

Getting started:

~$ git clone https://github.com/6809/MC6809.git
~$ cd MC6809
~/MC6809 $ ./cli.py --help

The output of ./cli.py --help looks like:

Usage: ./cli.py [OPTIONS] COMMAND [ARGS]...

╭─ Options ────────────────────────────────────────────────────────────────────────────────────────╮
│ --help      Show this message and exit.                                                          │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
╭─ Commands ───────────────────────────────────────────────────────────────────────────────────────╮
│ benchmark                 Run a MC6809 emulation benchmark                                       │
│ example                   Just run the MC6809/example6809.py example (CRC32 calculation)         │
│ profile                   Profile the MC6809 emulation benchmark                                 │
│ update-readme-history     Update project history base on git commits/tags in README.md           │
│ version                   Print version and exit                                                 │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯

There is a simple benchmark. Run e.g.:

~/MC6809$ ./cli.py benchmark --help

The output of ./cli.py benchmark --help looks like:

Usage: ./cli.py benchmark [OPTIONS]

 Run a MC6809 emulation benchmark

╭─ Options ────────────────────────────────────────────────────────────────────────────────────────╮
│ --loops       INTEGER  How many benchmark loops should be run? [default: 6]                      │
│ --multiply    INTEGER  est data multiplier [default: 15]                                         │
│ --help                 Show this message and exit.                                               │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯

profile

You can run the Python profiler against the benchmark, e.g.:

~/MC6809$ ./cli.py profile --help

The output of ./cli.py profile --help looks like:

Usage: ./cli.py profile [OPTIONS]

 Profile the MC6809 emulation benchmark

╭─ Options ────────────────────────────────────────────────────────────────────────────────────────╮
│ --loops       INTEGER  How many benchmark loops should be run? [default: 6]                      │
│ --multiply    INTEGER  est data multiplier [default: 15]                                         │
│ --help                 Show this message and exit.                                               │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯

development

For development exists dev-cli, e.g.:

~/MC6809$ ./dev-cli.py --help

The output of ./dev-cli.py --help looks like:

Usage: ./dev-cli.py [OPTIONS] COMMAND [ARGS]...

╭─ Options ────────────────────────────────────────────────────────────────────────────────────────╮
│ --help      Show this message and exit.                                                          │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
╭─ Commands ───────────────────────────────────────────────────────────────────────────────────────╮
│ check-code-style            Check code style by calling darker + flake8                          │
│ coverage                    Run tests and show coverage report.                                  │
│ fix-code-style              Fix code style of all cli_base source code files via darker          │
│ install                     Run pip-sync and install 'cli_base' via pip as editable.             │
│ mypy                        Run Mypy (configured in pyproject.toml)                              │
│ pip-audit                   Run pip-audit check against current requirements files               │
│ publish                     Build and upload this project to PyPi                                │
│ test                        Run unittests                                                        │
│ tox                         Run tox                                                              │
│ update                      Update "requirements*.txt" dependencies files                        │
│ update-test-snapshot-files  Update all test snapshot files (by remove and recreate all snapshot  │
│                             files)                                                               │
│ version                     Print version and exit                                               │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯

Run tests, e.g.:

~/DragonPy$ ./dev-cli.py coverage
# or just:
~/DragonPy$ ./dev-cli.py test
# or with different Python versions:
~/DragonPy$ ./dev-cli.py tox

TODO

Make new release

We use cli-base-utilities to generate the history in this README.

To make a new release, do this:

History

(Some of the points are related to DragonPy Emulator)

Expand older history entries ... * [v0.6.0](https://github.com/6809/MC6809/compare/v0.5.0...v0.6.0) * 2020-02-10 - update CLI Tests * 2020-02-10 - git ignore: +/publish.log * 2020-02-10 - update CLI and README * 2020-02-10 - test release v0.6.0.dev0 * 2020-02-10 - swap autopep8 and isort * 2020-02-10 - update Travis CI config * 2020-02-10 - fix code style * 2020-02-10 - update .join() statements * 2020-02-10 - setup poetry-publish * 2020-02-10 - apply pyupgrade * 2020-02-10 - apply code formatter * 2020-02-10 - f-strings convert * 2020-02-10 - WIP * [v0.5.0](https://github.com/6809/MC6809/compare/v0.4.6...v0.5.0) * 2015-10-19 - update release info/Version * 2015-09-10 - try to install python on osx * 2015-09-03 - move Condition Code Register (CC) into CPU via mixin class * 2015-09-03 - rename mixin classes * 2015-09-03 - code cleanup * 2015-09-03 - rename base class * 2015-09-03 - Optimize: Don't return value. Because not needed in every case. * 2015-09-03 - do it directly * 2015-09-03 - remove .get() calls * 2015-09-03 - update README and version number * 2015-09-01 - OSX builds do not yet support Python :( * 2015-09-01 - refactor/move self._convert_differend_width() * 2015-09-01 - Bugfix _convert_differend_width() * 2015-08-31 - display report * 2015-08-31 - Append coverage data to .coverage * 2015-08-31 - WIP * 2015-08-31 - try to run DragonPy tests, too. * 2015-08-31 - obsolete since nose use * 2015-08-26 - WIP: speedlimit <-> normal * 2015-08-25 - Update README.creole * 2015-08-24 - WIP: Split CPU code * [v0.4.6](https://github.com/6809/MC6809/compare/v0.4.5...v0.4.6) * 2015-08-24 - Update README. Release as v0.4.6 * 2015-08-24 - change speed limit stuff. * [v0.4.5](https://github.com/6809/MC6809/compare/v0.4.4...v0.4.5) * 2015-08-21 - release v0.4.5 * 2015-08-21 - update history * 2015-08-21 - add cli information for run via subprocess in DragonPy * 2015-08-21 - use click CliRunner().invoke() for cli test * 2015-08-21 - add info text to cli * 2015-08-21 - deactivate 'cpu6809_html_debug.py' - TODO: update it! * 2015-08-21 - cleanup * 2015-08-21 - Update README.creole * 2015-08-20 - define the entrypoint name * 2015-08-10 - update PyPi/Hithub links * [v0.4.4](https://github.com/6809/MC6809/compare/v0.4.3...v0.4.4) * 2015-08-10 - bugfix example to run with py2 and py3 * 2015-08-10 - remove run tests from cli * 2015-08-10 - remove obsolete code (has run unittests two times) * 2015-08-10 - test the example, too * [v0.4.3](https://github.com/6809/MC6809/compare/v0.4.2...v0.4.3) * 2015-08-10 - update from: * 2015-08-10 - just see that nose not fail: TODO update! * 2015-08-10 - bugfix ;) * 2015-08-10 - obsolete * 2015-08-10 - use click * 2015-08-10 - cleanup * 2015-08-10 - Exclude from nose * 2015-08-10 - start using nose * 2015-07-02 - add flattr link * [v0.4.2](https://github.com/6809/MC6809/compare/v0.4.1...v0.4.2) * 2015-05-27 - relase as v0.4.2 * 2015-05-27 - Add MC6809/example6809.py * 2015-05-27 - add CPU instance in CPU to memory * [v0.4.1](https://github.com/6809/MC6809/compare/v0.4.0...v0.4.1) * 2015-05-26 - Tested with Python 2.7, 3.4 and PyPy * [v0.4.0](https://github.com/6809/MC6809/compare/80f221b...v0.4.0) * 2015-05-26 - remove obsolete file * 2015-05-26 - cleanup * 2015-05-26 - +click +MC6809 cli entry point * 2015-05-26 - Add unittest for cli and add "--multiply" to benchmark * 2015-05-26 - fixup! add --source=MC6809 * 2015-05-26 - add --source=MC6809 * 2015-05-26 - remove dragonlib * 2015-05-26 - update coveralls token * 2015-05-26 - WIP: cleanup * 2015-05-26 - unittest run code * 2015-05-26 - add cli for benchmark * 2015-05-26 - add TODO * 2015-05-26 - bugfix imports * 2015-05-26 - remove obsolete files * 2015-05-26 - update setup.py * 2015-05-26 - fix links * 2015-05-26 - WIP: replace "DragonPy" -> "MC6809" * 2015-05-26 - rename * 2015-05-26 - cut README * 2015-05-20 - remove PyDev configs * 2015-05-20 - update README * 2015-05-20 - Update README.creole * 2015-05-20 - update travis-ci.org config * 2015-05-20 - move/rename cli code adn remove obsolete code * 2015-05-20 - Bugfix CLI and tests for it * 2015-01-28 - start to reimplement the CLI with "Click" * 2014-12-15 - use pygments syntax highlighter in BASIC editor * 2014-12-06 - Update .travis.yml * 2014-11-13 - 'dragonlib' as dependency * 2014-11-13 - outsource dragonlib: * 2014-11-13 - move LOG_LEVELS * 2014-10-08 - Bugfix for ReSt * 2014-10-08 - Add a setup.cfg * 2014-09-30 - add more info * 2014-09-30 - Bugfix * 2014-09-30 - WIP: BASIC editor: reformat code * 2014-09-30 - Bugfix renum tool + renum INVADER.bas * 2014-09-30 - PY3 bugfix * 2014-09-30 - Bugfix if line number > $ff * 2014-09-30 - Display also datum * 2014-09-29 - display more info on overflow error * 2014-09-29 - move BASIC programs * 2014-09-25 - Reimplement SBC09 ;) * 2014-09-25 - Split Op data - Squashed commit of the following: * 2014-09-24 - Disable some log output and update pypy win batches * 2014-09-24 - display_queue -> display_callback * 2014-09-22 - code cleanup and disable some log output * 2014-09-22 - move ROM load code * 2014-09-22 - code cleanup * 2014-09-22 - file rename and remove obsolete files * 2014-09-22 - move CPU utils * 2014-09-22 - move MC6809data * 2014-09-22 - ignore .idea/* * 2014-09-22 - update to new API * 2014-09-22 - Better default log formatter * 2014-09-18 - Bugfix unittest * 2014-09-18 - update test_run() * 2014-09-18 - display more info if e.g. the ROM loaded into a wrong area * 2014-09-18 - reimplement Multicomp 6809 ! * 2014-09-18 - change logging setup * 2014-09-14 - Update README, see also: * 2014-09-14 - Release v0.2.0 * 2014-09-14 - bugfix runtime * 2014-09-13 - display python version info in status line * 2014-09-13 - bugfix for Py2 * 2014-09-13 - add python major version number to pickle files * 2014-09-13 - Update unittests in dragonlib, too. * 2014-09-13 - reimplement: Run CPU not faster than given speedlimit * 2014-09-13 - update unitests * 2014-09-13 - bugfix six.moves.xrange * 2014-09-13 - remove old multiprocessing files * 2014-09-13 - use xrange from six.py * 2014-09-12 - replace own lib2and3 with six * 2014-09-12 - WIP: refactor logging usage * 2014-09-12 - WIP: cpu run * 2014-09-11 - doesnt needed * 2014-09-11 - Start, refactoring memory: * 2014-09-09 - add more comments into PIA * 2014-09-08 - add "target CPU burst loops" to GUI config * 2014-09-07 - WIP: Implement IRQ * 2014-09-08 - merge code * 2014-09-08 - implement a callback mechanism which trigger the CPU cycles * 2014-09-11 - fix ReSt generation? * 2014-09-11 - use array.array("B", ...) for RAM/ROM memory * 2014-09-11 - Add callback/middleware tests to write byte, too. * 2014-09-11 - better tracebacks by using reraise * 2014-09-07 - A better speedlimit solution. TODO: Codecleanup * 2014-09-07 - WIP: Better speed limit * 2014-09-07 - add a not really good working speedlimit * 2014-09-05 - WIP: Release as v0.1.0 * 2014-09-05 - include free v09.rom and vectrex ROM * 2014-09-05 - include scripts * 2014-09-05 - skip unittest if ROM files missing * 2014-09-05 - ignore /dist/ * 2014-09-05 - include some more files * 2014-09-05 - Use python-creole to generate ReSt README on the fly, see: * 2014-09-05 - implemend "hard reset" * 2014-09-05 - Just add the alternative commented * 2014-09-05 - Simple loop optimizing * 2014-09-05 - little more information on error * 2014-09-04 - Work-a-round for https://bitbucket.org/pypy/pypy/issue/1858/pypy3-localeformat-d-val-1 * 2014-09-04 - remove from __future__ import unicode_literals * 2014-09-04 - Adjust CPU burst count dynamically. * 2014-09-04 - update unittests * 2014-09-04 - remove threading stuff and use only tkinter after * 2014-09-04 - change grammar version in PyDev * 2014-09-04 - bugfix string.letters vs. string.ascii_letters * 2014-09-03 - bugfix cli unittest * 2014-09-03 - change print to log output * 2014-09-03 - explizit close * 2014-09-03 - log.warn() -> log.warning() * 2014-09-03 - Add a simple benchmark * 2014-09-03 - use '{:n}'.format(val) for formating cycles/sec * 2014-09-03 - add .pyo * 2014-09-03 - bugfix if run with -OO * 2014-09-03 - print all catched Ops vial decorator * 2014-09-03 - bugfix running CoCo from CLI * 2014-09-03 - use: python -m unittest discover * 2014-09-03 - updates: supported Python versions * 2014-09-03 - chnages to support python 2 and 3 with the same code * 2014-09-03 - changes to run with python2 and __future__ imports * 2014-09-03 - just run 2to3 script * 2014-08-31 - WIP: Just add dummy code for Vectrex * 2014-08-28 - Highlight line numbers and more the just one * 2014-08-28 - First, simple code highlighting * 2014-08-28 - Don't consume spaces between line number and code * 2014-08-28 - made BASIC Editor runable via CLI * 2014-08-27 - reimplement the CLI, today only for Dragon32/64 and CoCo * 2014-08-27 - WIP: move startup code * 2014-08-27 - move machine.py * 2014-08-27 - typo in README * 2014-08-27 - add history to README * 2014-08-27 - Bugfix: CoCo used the same default start address * 2014-08-26 - split ROM cfg, so that it can be loaded more than one ROM file: * 2014-08-26 - only code formatting * 2014-08-26 - raise error if perifery return None * 2014-08-20 - bugfix example prompt * 2014-08-20 - add CoCo info to README * 2014-08-20 - CoCo used a other default program start address than dragon * 2014-08-20 - WIP: Support CoCo in editor * 2014-08-20 - do the ' <-> :' and ELSE <-> :ELSE replacement internaly * 2014-08-20 - Use the new BASIC parser - TODO: Code cleanup! * 2014-08-20 - convert line number to int * 2014-08-20 - rename format functions * 2014-08-20 - add a BASIC parser with unittests * 2014-08-20 - code formating * 2014-08-18 - Add TODO unittests * 2014-08-18 - Better debug output * 2014-08-18 - better log output while load/inject BASIC program * 2014-08-18 - catch exception in unitest while running CPU * 2014-08-18 - Bugfix: support ON...GOTO and ON...GOSUB in renumbering * 2014-08-17 - add another renum unittest +code cleanup * 2014-08-17 - add "renumber listing" tool in editor * 2014-08-17 - TODO: Don't replace reversed words into tokens in comments and strings. * 2014-08-17 - bugfix: 'Cfg' object has no attribute 'memory_word_middlewares' * 2014-08-16 - Bugfix in inject BASIC program: * 2014-08-16 - WIP: move dump/load stuff into editor * 2014-08-15 - WIP: start splitting project: add "dragonlib" * 2014-08-14 - disable logging for run all unittests * 2014-08-14 - Add extract BASIC program unittest * 2014-08-14 - bugfix unittest init * 2014-08-14 - Bugfix: skip unittests if d32.rom not exists * 2014-08-14 - Start unittests with Dragon 32 ROM ;) * 2014-08-13 - transfert BASIC listing from editor into RAM worked!!! * 2014-08-13 - create a base test case only with some assertments * 2014-08-13 - move signed routines and... * 2014-08-12 - WIP: convert BASIC code to tokens * 2014-08-12 - bugfix display BASIC code: * 2014-08-11 - WIP: BASIC editor... * 2014-08-10 - WIP: GUI communication with CPU * 2014-08-08 - disable PUSH log in CPU * 2014-08-08 - add %(processName)s %(threadName)s to default log formatter * 2014-08-07 - calculate cycles/sec in GUI * 2014-08-07 - WIP: change queue stuff to work also with PyPy * 2014-08-07 - move some currently not useable files * 2014-08-07 - Bugfix: accessing cpu.cycles in CPUStatusThread * 2014-08-07 - add DragonPy schematic in README * 2014-08-07 - better Queue communication: * 2014-08-07 - cleanup machine start stuff * 2014-08-07 - move CPU into seperate thread * 2014-08-06 - Support CoCo keyboard input! * 2014-08-06 - bugfix in memory middleware * 2014-08-06 - read first the high-byte * 2014-08-06 - Update code around "reset vector": * 2014-08-06 - use memory.add_write_byte_middleware() and not a "own display RAM" * 2014-08-06 - move periphery memory hocks directly into memory * 2014-08-06 - rename memory callbacks to middlewares and now they can manipulate the byte * 2014-08-05 - WIP: Add CoCo * 2014-08-05 - Add info about broken CLI * 2014-08-04 - ./Dragon64_test.py worked! * 2014-08-04 - ignore *.rom files * 2014-08-03 - move display_cycle_interval() into CPU * 2014-08-03 - WIP: Split byte/word in periphery * 2014-08-02 - add info to Dragon Keyboard * 2014-08-01 - WIP: Keyboard input seems to work basicly!!! * 2014-07-31 - add /InputOutput/keyboard.bas * 2014-07-30 - WIP: Keyboard input to PIA * 2014-07-29 - use bit utils in CPU, too. * 2014-07-29 - add utilities around bit manipulations * 2014-07-28 - use central logger * 2014-07-27 - Quick work-a-round for travis * 2014-07-27 - WIP: Dragon Text mode with D64 * 2014-07-25 - Add a Dragon32_test.py * 2014-07-24 - multiprocessing.JoinableQueue() -> multiprocessing.Queue() * 2014-07-24 - update console test * 2014-07-24 - reimplement "--display-cycle" * 2014-07-24 - work-a-round for double log output * 2014-07-24 - Change queue.get() stuff * 2014-07-24 - remove concept files * 2014-07-23 - remove obsolete text * 2014-07-23 - use global log * 2014-07-23 - use multiprocessing.JoinableQueue * 2014-07-23 - add names * 2014-07-23 - call cpu.quit() * 2014-07-23 - WIP: Merge Bus read & write Threads. Use thread.interrupt_main() * 2014-07-22 - WIP: KeyboardInterrupt * 2014-07-20 - WIP: sbc09 console * 2014-07-20 - Bugfix exit all threads/processes * 2014-07-20 - don't add more then one log handler * 2014-07-18 - unify "running" stuff * 2014-07-18 - rename multiprocess files * 2014-07-18 - code cleanup, use Simple6809Cfg as default, add '--dont_open_webbrowser' * 2014-07-18 - WIP: Simple6809 is running * 2014-07-17 - move CPU into components * 2014-07-17 - WIP: split concept code * 2014-07-17 - WIP: multiprocessing concept 2 * 2014-07-17 - WIP: new multiprocessing concept * 2014-07-17 - just rename * 2014-07-17 - use multiprocessing under linux and subprocess unter windows * 2014-07-17 - WIP: Use multiprocessing to start CPU * 2014-07-17 - move CPU http server into a seperate thread. * 2014-07-17 - Bugfix CPU status * 2014-07-16 - remove loop stuff and use more threading * 2014-07-16 - Recalculate the op call burst_count * 2014-07-16 - That's fixed with pager ;) * 2014-07-16 - Use pager to get the user input. * 2014-07-16 - remove unused code * 2014-07-15 - add a console version of Simple6809 ROM without bus communication * 2014-07-15 - remove unused code & update README * 2014-07-15 - add complete DAA unittest * 2014-07-15 - display output is a good idea ;) * 2014-07-15 - Add unittest for DAA * 2014-07-15 - refactor DAA * 2014-07-15 - Bugfix DAA - TODO: Add unittests for it! * 2014-07-15 - moved * 2014-07-14 - Bugfix sbc09 unittest and add more sbc09 tests * 2014-07-14 - WIP: unittests with sbc09 * 2014-07-14 - WIP: New call instruction implementation * 2014-07-14 - Bugfix: is needes, e.g.: in sbc09 * 2014-07-14 - remove some test assert statements * 2014-07-14 - rename some pointer * 2014-07-14 - travis should only test master and stable * 2014-07-13 - remove speedup Simple6809 RAM test * 2014-07-13 - disable many logging lines * 2014-07-13 - set cc flags more than Xroar on startup * 2014-07-13 - merge some code in humanize.py * 2014-07-13 - move trace code: * 2014-07-13 - remove unused stuff * 2014-07-13 - remove "--compare_trace" adn update README * 2014-07-13 - Fix Travis * 2014-07-13 - boring in unittests ;) * 2014-07-13 - remo area debug and code cleanup * 2014-07-13 - test with pypy, too and diable coveralls * 2014-07-13 - Add some Dragon32 mem info * 2014-07-13 - Bugfix ASR/LSR: Bit seven is held constant. Catched with BASIC INT() * 2014-07-13 - Update unittest for TFR/EXG * 2014-07-13 - Bugfix: TFR and EXG * 2014-07-13 - add sixxie and tormod * 2014-07-13 - Bugfix INC * 2014-07-12 - add log to file * 2014-07-12 - add comments +typo * 2014-07-12 - better info on out of range writes * 2014-07-12 - add doctest * 2014-07-12 - Bugfix ADC... the last Bug??? * 2014-07-11 - Add a working test for "FPA0_to_D" * 2014-07-11 - better debugging, add addr info after debug line * 2014-07-11 - Add some thanks... * 2014-07-11 - Just for devloper to play a little bit with the BASIC Interpreter. * 2014-07-11 - cleanup BASIC09 tests * 2014-07-09 - Add CLI to xroar filter script and add README * 2014-07-08 - update dev. tool * 2014-07-08 - merged "Programm Flow Instructions" * 2014-07-08 - add call number and datetime in HTML debug * 2014-07-07 - WIP: Test around BASIC floating point routines * 2014-07-07 - remove debug stuff and add a "debug.html" tracing generator * 2014-07-07 - update html opcode genrator script and add html file. * 2014-07-06 - WIP: 6809 data to html export * 2014-07-06 - disable open webbrower * 2014-07-06 - Add a memory callback functionality * 2014-07-04 - update division code * 2014-07-04 - add test for ROL,ROR in memory * 2014-07-04 - Bugfix CLI * 2014-07-03 - Bugfix ASR and add unittests for it. * 2014-07-03 - just move to group * 2014-07-03 - .gitignore * 2014-07-03 - add missing unittests after coverage run * 2014-07-03 - Test BASIC Interpreter works! * 2014-07-03 - WIP: Run tests with a alive BASIC Interpreter * 2014-07-03 - update cfg files * 2014-07-03 - add "create coverage report" in README * 2014-07-03 - remove syntax error in obsolete file * 2014-07-03 - bugfix coverage packagename * 2014-07-03 - change all package path, after file move * 2014-07-03 - moved all files into dragonpy package dir * 2014-07-03 - add packagename * 2014-07-03 - add coveralls in travis cfg. * 2014-07-03 - change TODO info in unittets * 2014-07-03 - add coveralls.io status image in README * 2014-07-03 - add coveralls cfg * 2014-07-03 - add unittest info in README * 2014-07-03 - add setup.py and travis cfg. * 2014-07-03 - better "first tim called" debug info. * 2014-07-03 - add unittest for SUBA indexed * 2014-07-03 - Update division test code * 2014-07-02 - WIP: ea indexed address modes * 2014-07-02 - Display CWAI not implemented error * 2014-07-02 - better error message * 2014-07-02 - refactor TFR, EXG stuff and add unittests * 2014-07-02 - add more Indexed tests * 2014-07-02 - typo * 2014-07-02 - add second division test code * 2014-07-02 - add seperate test for address modes * 2014-07-02 - group ST/LD and add unittests * 2014-07-02 - remove comment: it's correct * 2014-07-02 - move all not implemented ops * 2014-07-01 - bugfix EOR - TODO: Add a test for it. * 2014-07-01 - test with more interesting areas * 2014-07-01 - add test for ABX * 2014-07-01 - refactor ANDCC and ORCC * 2014-07-01 - add test for ORCC and ANDCC * 2014-07-01 - update example output * 2014-07-01 - reorder crc32 tests * 2014-07-01 - Bugfix for failed test. * 2014-07-01 - Update crc32 test. Works now! * 2014-07-01 - disable prints * 2014-07-01 - moved/grouped some ops * 2014-07-01 - Bugfix ROR and add unittest for it. * 2014-07-01 - WIP: add crc32 code * 2014-06-30 - Add division code test * 2014-06-30 - WIP: 6809 32/16 divison test * 2014-06-30 - nicer debug output * 2014-06-30 - add unittests for PSHU and PULU * 2014-06-30 - Start to add 6809 unittests with small assembler programs: crc16 * 2014-06-30 - bugfix Push/Pull unittests * 2014-06-30 - add unittest for BLT and LBLT * 2014-06-30 - add unittest for SBCA * 2014-06-30 - move DEC test * 2014-06-29 - split/merge arithmetic shift tests * 2014-06-29 - unify: r & 0xff * 2014-06-29 - split arithmetic op tests * 2014-06-29 - comment debug output * 2014-06-29 - add unittest for ADDD and DECA * 2014-06-28 - Add test for ROL * 2014-06-28 - cleanup ADD and add unittest * 2014-06-28 - disallow out of range write into memory * 2014-06-28 - implement BRN, BVC and BVS * 2014-06-28 - Bugfix INC and add unittests * 2014-06-28 - add LSLA unittest * 2014-06-28 - split branch unittests * 2014-06-28 - code cleanup and add unittests for CMP * 2014-06-27 - Use only 1KB RAM for Simple6809, too. * 2014-06-27 - add hacked script for copy&paste .lst content from e.g.: http://www.asm80.com/ * 2014-06-27 - WIP CPU control server * 2014-06-27 - add unittest for NEG memory * 2014-06-27 - Update NEG memory, TODO: add tests for it, too. * 2014-06-27 - Add complete range unittests for update_HNZVC_8 * 2014-06-27 - bugfix unittest file * 2014-06-27 - Bugfix NEGA and NEGB and update unitests for them * 2014-06-27 - update unittest code * 2014-06-27 - update accu unittests * 2014-06-26 - add unittest for ORA and ORCC * 2014-06-26 - Add unittests for BPL and LBPL * 2014-06-26 - bugfix for /debug/ * 2014-06-26 - Add unittests for LEAU and LDU * 2014-06-26 - Bugfix TST extended * 2014-06-26 - Bugfix in TST and add unittest for it * 2014-06-26 - Bugfix BGE * 2014-06-25 - add another simple test code * 2014-06-25 - add come cary flag tests * 2014-06-25 - Add Zero-Flag tests * 2014-06-25 - add a test code, use test config * 2014-06-24 - WIP: turn on DEBUG via POST request * 2014-06-24 - move tests TODO: Update all * 2014-06-24 - Better "called the first time:" info line. * 2014-06-24 - add info about ROMs * 2014-06-24 - README Update * 2014-06-23 - change reset debug output * 2013-10-31 - somthing wrong in dragon cycle/update calls ?!? * 2013-10-31 - commit current state: * 2013-10-31 - insert TODOs update README * 2013-10-31 - refactor: * 2013-10-30 - merge periphery code * 2013-10-30 - exit if Pygame is not installed * 2013-10-30 - implement MUL * 2013-10-30 - truncate long lines in traceback * 2013-10-29 - add a simple console, so it's runable without TKinter * 2013-10-29 - add cfg.BURST_COUNT * 2013-10-29 - display error info on exit * 2013-10-29 - update with removed logging output * 2013-10-29 - disable many logging output * 2013-10-28 - add a note about current performace * 2013-10-28 - pygame, numpy is not needed in every config * 2013-10-27 - convert chars to display, why? * 2013-10-27 - deactivate "sys exit" on trace difference * 2013-10-27 - implement SEX * 2013-10-27 - add update_HNZVC_16() * 2013-10-27 - update half-carry, though H is normaly "undefined" * 2013-10-27 - add hacked scb09 trace compare * 2013-10-27 - Bugfix CMP: update half-carry flag, too. * 2013-10-27 - add Lennart Benschop 6809 stuff (released under the GPL) * 2013-10-26 - Implement DAA, EXG and bugfix LSR * 2013-10-26 - bugfix activate logging later * 2013-10-26 - Bugfix in data: EXG need postbyte * 2013-10-26 - add current example * 2013-10-26 - display key events * 2013-10-25 - less debug output * 2013-10-25 - add LSL unittest * 2013-10-25 - add ANDA unittest * 2013-10-25 - add a unittest with a routine from origin ROM * 2013-10-24 - Update some CC handling. * 2013-10-24 - add CC unittest with DEC and update other tests * 2013-10-24 - Add CC unittest with INC * 2013-10-24 - Bugfix SUB and add a working unittest for SUB and CC flags * 2013-10-24 - first real working CC test with ADDA * 2013-10-23 - display first call * 2013-10-23 - Bugfix: set CC flags only if not set before * 2013-10-23 - don't raise if error was before and better debug messages * 2013-10-22 - nicer TK window * 2013-10-22 - some updates in unittest * 2013-10-22 - better trace compare * 2013-10-22 - use XRoar CC code * 2013-10-22 - Update exported 6809 data: * 2013-10-22 - nicer output + add screenshot * 2013-10-21 - wrap around value * 2013-10-21 - add CC tests. * 2013-10-21 - change debug output * 2013-10-21 - update unittest * 2013-10-21 - add --area_debug_cycles * 2013-10-21 - merge SUB8 and SUB16 * 2013-10-21 - Implement BGE and BLT * 2013-10-21 - bugfix address modes * 2013-10-21 - use delimiter=';' * 2013-10-21 - use csv modul for export * 2013-10-21 - update state in README * 2013-10-21 - implement ANDCC * 2013-10-21 - bugfix get ea+m DIRECT * 2013-10-21 - TST need mem * 2013-10-21 - add new csv * 2013-10-21 - Add undocumented RESET opcode 0x3e * 2013-10-21 - data updates: * 2013-10-21 - remove stuff for stack pointer checks * 2013-10-21 - more debug info from get_ea_indexed() * 2013-10-21 - remove internal push/pull check: * 2013-10-21 - updates for new 6809 data * 2013-10-21 - bugfix TFR, JSR data * 2013-10-21 - ea is needed if write to memory * 2013-10-21 - * "needs_ea" is not the same for all ops * 2013-10-21 - needs_ea for all branch instructions * 2013-10-21 - add "needs_ea" * 2013-10-21 - rename "operand" to "register" * 2013-10-21 - remove "addr mode" register and stack * 2013-10-21 - manual changes for "reads from memory" info * 2013-10-21 - move HNZVC info from instruction to op code * 2013-10-21 - add a note about read_from_memory * 2013-10-20 - start to use the new data. Not ready, yet. * 2013-10-20 - change "-" to None * 2013-10-20 - generate a new op code info file * 2013-10-20 - merge with existing information * 2013-10-19 - pretty print the result, too. * 2013-10-19 - try to collect all data in a new way. * 2013-10-19 - add missing instructions * 2013-10-18 - add op info * 2013-10-17 - TODO: change 6809 data py * 2013-10-17 - long branches allways MEM_ACCESS_WORD * 2013-10-17 - more info on push/pull * 2013-10-17 - implement BGT * 2013-10-17 - stop on endless loops and merge code * 2013-10-17 - bugfix in get_indexed_ea() * 2013-10-17 - bugfix in stack count check * 2013-10-17 - info if mem info is not active * 2013-10-17 - * implement ABX, ASR, BLE, EOR, LSR, NOP, ROR, SBC, SUB16 * 2013-10-16 - add not working CC half carry test * 2013-10-16 - display char in memory write * 2013-10-16 - bugfix missing attribute * 2013-10-16 - add check * 2013-10-16 - bugfix ORCC and ROL * 2013-10-16 - implement OR * 2013-10-16 - bugfix for EOF if XRoar log file * 2013-10-16 - implement ADDD * 2013-10-16 - add a internal stack push/pull counter with check * 2013-10-16 - update CC * 2013-10-16 - bugfix TST * 2013-10-16 - Merge code for BSR and JSR * 2013-10-16 - rename half carry method * 2013-10-16 - less debug if value out of range * 2013-10-16 - remove raise in ORCC * 2013-10-16 - bugfix push/pull * 2013-10-16 - bugfix test_TFR03() * 2013-10-16 - stop on wrong NEG (e.g.: jump to empty RAM area) * 2013-10-16 - better traceback * 2013-10-16 - clear hacked exception * 2013-10-16 - for eclipse :( * 2013-10-15 - Update/bugfixes because of mem_read information * 2013-10-15 - display cycles/sec * 2013-10-15 - better error info * 2013-10-15 - more debug info in memory access * 2013-10-15 - add "mem_read" and "mem_write" into MC6809 data * 2013-10-15 - send op address over bus, too. * 2013-10-14 - bugfix BLO / BHS * 2013-10-14 - implement AND * 2013-10-14 - add content in "read byte" debug info * 2013-10-14 - implement INC memory * 2013-10-14 - Bugfix: wrong mem access PSH, PUL * 2013-10-13 - conmpare first the registers than CC * 2013-10-13 - debug output for CPU cycles * 2013-10-13 - Display CC debug like '.F.IN..C' and compare it seperate * 2013-10-13 - bugfix get_direct_byte() * 2013-10-13 - implement PULS * 2013-10-13 - nicer debugger output * 2013-10-13 - Bugfix BSR * 2013-10-13 - implement ORCC * 2013-10-12 - bugfix in IllegalInstruction * 2013-10-12 - add a simple debugger * 2013-10-12 - implement BHI * 2013-10-12 - reimplement illegal ops * 2013-10-12 - bugfix: Hacked bugtracking only with Dragon 32 * 2013-10-12 - add addr in error message * 2013-10-12 - log mem access as info * 2013-10-12 - hacked speedup Simple6809 RAM test * 2013-10-12 - Hacked bugtracking only with Dragon 32 * 2013-10-12 - insert CC in XRoar trace line, too * 2013-10-12 - use sam attr than XRoar in PAGE1/2 ops * 2013-10-12 - use debug.error for TODOs in PIA/SAM * 2013-10-12 - special RAM init for Dragon. * 2013-10-12 - Bugfix pull_word() (e.g. RTS) * 2013-10-12 - Bugfix BLS * 2013-10-12 - bugfix LEA * 2013-10-11 - add two more CC test files * 2013-10-11 - better opcode .csc export output * 2013-10-11 - fix unittest * 2013-10-11 - add screenshots * 2013-10-11 - Add BASIC programm: Test CC Registers * 2013-10-10 - add a hacked bug tracking: xroar trace compare * 2013-10-10 - bugfix BEQ * 2013-10-10 - bugfix in indexed addressing mode * 2013-10-10 - bugfix init value in PIA * 2013-10-10 - add reset call to debug output * 2013-10-10 - merge read pc byte/word methods * 2013-10-10 - Bugfix in log output: Display PC and not ea ;) * 2013-10-10 - Bugfix STA/STB and CC update * 2013-10-10 - debug also CC registers * 2013-10-10 - tweak --verbosity=20 output simmilar to XRoar -trace * 2013-10-10 - implement "--max" cli argument * 2013-10-09 - add "--area_debug_active" in CLI * 2013-10-09 - implement ADC and BSR * 2013-10-09 - return 0x0, while read/write outside memory * 2013-10-09 - split mem info: * 2013-10-09 - Add unittest * 2013-10-09 - commit idea for CC * 2013-10-09 - update CPU for new MC6809_data_raw: * 2013-10-09 - nicer output * 2013-10-09 - update 6809 data: * 2013-10-09 - CC register updates * 2013-10-08 - add tests für CC.H and CC.C, but's seems to be wrong?!? * 2013-10-08 - Update unittest, so they are runable * 2013-10-07 - Bugfix COM * 2013-10-07 - add CLI examples into README * 2013-10-07 - bugfix: it's the right position * 2013-10-07 - commit current state: * bus I/O: split byte/word calls * bus I/O: use struct for Sending responses from periphery back to memory * split memory from cpu module * start with Simple6809Periphery * 2013-10-07 - * Add support for more than Dragon setups. * Start adding Simple6809 support * 2013-10-06 - use bus for the rest * 2013-10-06 - use reset() to ser CC F&I and init PC * 2013-10-06 - implement support for PAGE1/2 opcodes * 2013-10-06 - remove old code * 2013-10-06 - implement CMP8 and CMP16 * 2013-10-06 - set inital PC to RESET_VECTOR == 0xb3b4 * 2013-10-06 - implement LEAS,LEAU and LEAX, LEAY * 2013-10-06 - Set start stack pointer to 0xffff * 2013-10-06 - *wrap around 8/16-bit register values * 2013-10-06 - revert S to object: So it's the same API than other register objects * 2013-10-06 - add everywhere "m" argument * 2013-10-06 - * Implement LSL / ROL * 2013-10-06 - implement BMI, BPL * 2013-10-06 - update unittests (work in progress) * 2013-10-06 - * Implement JSR * 2013-10-06 - implement BLO/BCS/LBLO/LBCS and BHS/BCC/LBHS/LBCC branch * 2013-10-06 - bugfix direct byte - TODO: direct word * 2013-10-06 - Implement ST16 + Bugfix ST8 * 2013-10-06 - reformat DocString * 2013-10-05 - implement BRA/LBRA * 2013-10-04 - stop before loop * 2013-10-04 - bugfix BNE and JMP * 2013-10-04 - start a simple memory hex viewer * 2013-10-03 - Add unittest for LDA, LDB, STA, STB and LDD in one test * 2013-10-03 - Bugfix m <-> ea missmatch in address methods * 2013-10-03 - * Implement ADD8 * 2013-10-03 - add a low-level-register test * 2013-10-03 - remove some init debug messages * 2013-10-02 - start implementing SUB8 * 2013-10-02 - * bugfix: differ between ea and memory content * Implement NEG memory * 2013-10-01 - starts implementing NEG, but seems to be buggy :( * 2013-10-01 - remove many startup debug output * 2013-10-01 - add name to ConditionCodeRegister for uniform API * 2013-10-01 - bugfix missing API update * 2013-10-01 - reimplement TFR * 2013-10-01 - implement TST * 2013-10-01 - * Implement BEQ * use same debug output in BNE * 2013-10-01 - Implement BIT * 2013-10-01 - implement BNE * 2013-10-01 - implement "relative" addressing mode * 2013-09-30 - add a test * 2013-09-30 - check mem values and make 'end' optional * 2013-09-30 - implement INC * 2013-09-30 - don't set overflow flag back to 0 * 2013-09-24 - reimplement LD8 * 2013-09-24 - implement DEC * 2013-09-24 - use new skeleton * 2013-09-24 - * don't split instrutions * 2013-09-24 - * split COM * implement COM * 2013-09-24 - * merge accu/CC code * all registers are objects with get()/set() method * leave unimplemented methods in skeleton class * reimplement JMP, LD16, ST8 * 2013-09-24 - mark 8bit CC update methods * 2013-09-24 - rename CC calls * 2013-09-23 - start LD16: TODO: operand should be a object with get/set methods! * 2013-09-23 - implement JMP * 2013-09-23 - insert genereted code * 2013-09-23 - bigfix ;) * 2013-09-23 - change CSV data * 2013-09-23 - Use variables in "addr_mode" * 2013-09-23 - rename dir * 2013-09-23 - * insert 'cc update' calls for the most cases * better DocString * change function signature if nessesary * * 2013-09-23 - * split LEA * move cc bits info to INSTRUCTION_INFO * 2013-09-23 - add a simple CSV export * 2013-09-23 - Use also first and last part to link * 2013-09-23 - reimplement skeleton maker script * 2013-09-23 - * change cycles/bytes to integers * Merge PAGE and SWI * 2013-09-20 - merge informations, current result is MC6809_data_raw.py * 2013-09-20 - add hacked 6809 data scraping scripts. * 2013-09-19 - don't use property witch access methods... * 2013-09-19 - * Bugfix NEG * stop in soft witch * 2013-09-19 - * support JMP, NEG in all addressing modes * inc cycles in Memory class * 2013-09-19 - * change memory access methods to properties, so it's unify with register access * merge COM ops * 2013-09-19 - COM * 2013-09-19 - add to TODO ;) * 2013-09-19 - uniform debug output * 2013-09-18 - * move accumulator to seperate object * 2013-09-18 - remove register from 6309 and add some more links. * 2013-09-17 - * Add LD 8-bit load register from memory * move the CC frags into seperate module * 2013-09-17 - add "LD 16-bit load register from memory" and merge code with ST16 * 2013-09-17 - check if ops only defined one time * 2013-09-17 - accumulator D, W and Q as property * 2013-09-17 - add ST 16-bit store register into memory * 2013-09-17 - add some 8-bit arithmetic operations * 2013-09-17 - debug write to text screen addresses * 2013-09-17 - add LSR * 2013-09-17 - add ORA * 2013-09-17 - bugfix indexed addressing modes * 2013-09-16 - add BNE * 2013-09-16 - make current opcode class wide. Handle list of opcodes * 2013-09-16 - FIXME: word and signed8 ??? * 2013-09-16 - add copyright notes * 2013-09-16 - form if...elif to a dict access * 2013-09-16 - add LEAX indexed * 2013-09-16 - add Indexed addressing modes, but needs tests * 2013-09-16 - short debug output * 2013-09-16 - stop on illegal ops * 2013-09-15 - little-endian or big-endian ?!?! * 2013-09-12 - better unittest output in verbosity mode * 2013-09-11 - Display more mem info * 2013-09-11 - add ADDA extended, CMPX extended and JSR extended * 2013-09-11 - bugfix ROM/RAM size * 2013-09-11 - Change sizes, but: http://archive.worldofdragon.org/phpBB3/viewtopic.php?f=5&t=4363 * 2013-09-11 - Add print_debug_info() to config class * 2013-09-11 - add op 0x00 NEG direct * 2013-09-11 - set cycles in ops * 2013-09-11 - add JMP * 2013-09-11 - rename CC flags * 2013-09-11 - setup logging * 2013-09-11 - move STACK_PAGE and RESET_VECTOR into cfg * 2013-09-11 - remove read_word_bug() * 2013-09-10 - cleanup and start to implement the 6809 CPU * 2013-08-29 - Update configs.py * 2013-08-27 - add some links * 2013-08-27 - fork and rename some files, change some settings... But will every be a Dragon 32 emulator? * 2013-08-20 - move files * 2013-08-20 - Initial commit * 2013-08-19 - Use MAX_HZ_VARIATION to seperate bit 1 or bit 0 display some statistics of bit detection * 2013-08-18 - add status while reading WAV file. * 2013-08-15 - add a script to convert dragon 32 Cassetts WAV files into plain text. * 2013-03-08 - added note about exact pip and brew commands I used * 2013-03-08 - improved hires colour, fixed non-ASCII key crash, fixed to work with later pygame/numpy * 2012-07-23 - added explicit mention of License in README * 2012-07-23 - added mention of numpy requirement * 2012-07-23 - added MIT license * 2012-07-23 - treat README as Markdown * 2012-04-18 - made applepy.py executable * 2011-10-01 - add --pc switch for starting run at specific program counter * 2011-10-01 - initialise display state variables in constructor * 2011-08-21 - add console control utility * 2011-08-21 - implement post to /memory in control requests * 2011-08-20 - control channel is now HTTP/REST/JSON * 2011-08-20 - add fileno() method to ControlHandler for better compatiblity with select() * 2011-08-20 - disassemble show instruction bytes * 2011-08-20 - reincarnate disassembler on control channel * 2011-08-20 - add dump memory command * 2011-08-20 - refactor control command processing * 2011-08-19 - start of cpu core control channel * 2011-08-19 - graceful shutdown if cpu core exits * 2011-08-19 - abandon startup if cpu module does not start * 2011-08-19 - rename --ui switch to --bus * 2011-08-18 - open memory files in binary mode * 2011-08-18 - update curses UI for socket comms * 2011-08-18 - use sockets for comms instead of stdio * 2011-08-19 - Edited README via GitHub * 2011-08-19 - Mention the minimal applepy_curses.py in README * 2011-08-16 - attempt to skip to data part of tape * 2011-08-16 - finish cassette support * 2011-08-16 - initial cassette input * 2011-08-14 - Separate CPU core and UI processes * 2011-08-15 - removed unused import * 2011-08-15 - adjusted speaker sample length to allow for leading edge * 2011-08-15 - made options...um...optional param to Memory so tests pass * 2011-08-15 - command line options: --rom, --ram, --quiet * 2011-08-15 - map left/right arrow keys to ^H/^U * 2011-08-15 - add flash attribute to text mode * 2011-08-15 - moved speaker buffer playing into the Speaker class * 2011-08-15 - implemented speaker; not a bad hack :-) * 2011-08-15 - pass in None for cycles so tests run * 2011-08-15 - refactored memory access so cycle can be passed in * 2011-08-14 - implemented cycle calculation (except for page boundary crossing) * 2011-08-14 - added notes on implementation that seems to give the right result * 2011-08-14 - more groking of why memory-based ASL, DEC, INC, LSR, ROL and ROR take what they take * 2011-08-14 - worked out why STA seemed an exception * 2011-08-14 - updated notes, fixing what seems to a mistake on the webpage I referenced * 2011-08-14 - typo and formatting fixes in cycle notes * 2011-08-14 - notes on cycle times * 2011-08-14 - added test_run to run CPU over a fragment of memory with no UI event handling (for automated testings) * 2011-08-14 - improved coloured for better whites * 2011-08-13 - fixed missing self * 2011-08-13 - refactored memory so RAM just subclasses ROM, adding write_byte * 2011-08-13 - whitespace nits * 2011-08-13 - added load_file to RAM * 2011-08-13 - updated README credits and status * 2011-08-13 - implemented HIRES colour * 2011-08-13 - use pregenerated character bitmaps for text mode * 2011-08-13 - added HIRES graphics support based on code from ghewgill: https://github.com/ghewgill/applepy/commit/5aa8ca2caa82cacdae08d0ffdbab2083b0f4c7a1 * 2011-08-13 - always draw the spaces between scanlines * 2011-08-13 - in mixed mode, assume monitor is colour * 2011-08-13 - refactored update_text and update_lores into a single method * 2011-08-13 - display full width of characters * 2011-08-13 - character heights are really 8 not 9 * 2011-08-13 - implemented LORES graphics * 2011-08-13 - make display optional (for testing) * 2011-08-13 - got tests working again after memory refactor * 2011-08-13 - ported to pygame and added bit-accurate characters * 2011-08-07 - if writing to text screen row group 3 just skip instead of throwing exception * 2011-08-07 - updated README to reflect status and give credit * 2011-08-07 - don't treat indices as signed in indexed addressing modes (ht: ghewgill) * 2011-08-07 - consistent whitespace * 2011-08-07 - split memory handling into separate classes for RAM, ROM and Soft Switches * 2011-08-07 - add disassembler, enable for dump mode * 2011-08-07 - don't allow writes to ROM area (this caused the ][+ ROM to hang on boot) * 2011-08-07 - fix typos for zero_page_y_mode in instruction dispatch table * 2011-08-07 - fix dump() function so it works (when uncommented) * 2011-08-07 - fix typo in instruction table * 2011-08-07 - simplify calculating signed values in adc and sbc * 2011-08-07 - only need to allocate 64k of memory * 2011-08-07 - if curses can't write a character to the screen, just skip it; fixes #1 * 2011-08-07 - improved implementation of indirect bug across page boundaries including indexed indirects as well * 2011-08-07 - added unit tests * 2011-08-07 - fixed error in BVS * 2011-08-07 - whitespace nit * 2011-08-07 - properly use 0 and 1 not False and True for flags * 2011-08-07 - implemented non-accumulator version of ROR * 2011-08-06 - fixed inverse use of carry in SBC * 2011-08-06 - turns out PLA DOES affect NZ after all * 2011-08-06 - renamed load to load_file, added a load to load memory from byte list and refactored loading code * 2011-08-06 - emulate indirect mode bug in 6502 * 2011-08-06 - reimplemented CMP, CPX and CPY based on 2006/2007 code * 2011-08-06 - reimplemented ADC and SBC based on 2006/2007 code * 2011-08-06 - apparently PLA does not affect NZ flags * 2011-08-06 - little BIT of simplication * 2011-08-06 - cleaned up ASL implementation * 2011-08-06 - TSX updated NZ flags * 2011-08-06 - fixed stray comment * 2011-08-06 - factored out stack pull/push * 2011-08-06 - refactored flags to status byte and back * 2011-08-06 - slight refactor of update_nz and update_nzc * 2011-08-06 - implemented BRK and RTI * 2011-08-06 - make further use of addressing mode refactor * 2011-08-06 - added zero_page_y_mode * 2011-08-06 - added wrap-around for zero_page_x_mode * 2011-08-06 - refactored addressing mode code * 2011-08-06 - added if __name__ == "__main__" test for mainline * 2011-08-06 - simplified screen address to col/row translation based on code from 2006 * 2011-08-06 - initial update from 2001 code

donation