DragonPy is a Open source (GPL v3 or later) emulator for the 30 years old homecomputer Dragon 32 and Tandy TRS-80 Color Computer (CoCo)...

The MC6809 project is used to emulate the 6809 CPU.

	travis-ci.org/jedie/DragonPy
	coveralls.io/r/jedie/DragonPy
	requires.io/github/jedie/DragonPy/requirements/

Dragon 32 with CPython 3 under Linux:

Tandy TRS-80 Color Computer 2b with CPython 2 under Windows:

DragonPy is written in Python. It's platform independent and runs with Python and PyPy under Linux/Windows/OSX/... It's tested with Python 2.7.x and 3.4, PyPy2 and PyPy3.

DragonPy will not be a second XRoar written in Python. This project is primarily to lean and understand.

Future goals are:

• Implement a integrated development environment for BASIC programs

A full featured Dragon / CoCo emulator is XRoar.

The Dragon 32 / 64 and CoCo ROMs works in Text mode. Also the "single board computer" ROMs sbc09, Simple6809 and Multicomp6809 works well.

There is a rudimentary BASIC editor with save/load BASIC programm listings direct into RAM.

Looks like this:

(older version of the editor)

The Vectrex (Wikipedia) is a vector display-based video game console. The Hardware are only the 6809 CPU, a 6522 Versatile Interface Adapter and the AY-3-8912 sound chip.

Current state is completely not usable. The 6522 is only a dummy implementation. It makes only sense to display some trace lines, e.g.:

(DragonPy_env)~/DragonPy_env$ bin/python src/dragonpy/DragonPy_CLI.py --verbosity 5 --machine=Vectrex run --trace --max_ops 1

Use "BASIC editor / open" in the main menu to open the editor.

You can load/save ASCII .bas files from you local drive or just type a BASIC listing ;) With "inject into DragonPy" you send the current listing from the Editor to the Emulator and with "load from DragonPy" back from emulator to editor. Note: The is currently no "warning" that un-saved content will be "overwritten" and there is no "auto-backup" ;)

The "renumbering" tool can be found in the editor window under "tools"

You can also run the BASIC Editor without the Emulator:

(DragonPy_env)~/DragonPy_env$ bin/python src/dragonpy/DragonPy_CLI.py editor

A rudimentary BASIC source code highlighting is available and looks like this:

Special feature: The Line number that are used in GOTO, SOGUB etc. are extra marked on the left side.

IMPORTANT: The PyPi package name is DragonPyEmulator and not only "DragonPy"!!!

The is a virtualenv bootstrap file, created with bootstrap_env, for easy installation.

Get the bootstrap file:

/home/FooBar$ wget https://raw.githubusercontent.com/jedie/DragonPy/master/boot_dragonpy.py

There are tree types of installation:

e.g.:

/home/FooBar$ python3 boot_dragonpy.py ~/DragonPy_env --install_type git_readonly

This creates a virtualenv in ~/DragonPy_env and used git to checkout the needed repositories.

In this case (using --install_type=git_readonly) the git repository are in: .../DragonPy_env/src/ So you can easy update them e.g.:

/home/FooBar$ cd ~/DragonPy_env/src/dragonpy
/home/FooBar/DragonPy_env/src/dragonpy$ git pull

The is a simple "starter GUI", just call the cli without arguments:

~/DragonPy_env/bin/DragonPy

Or call it in a activated environment, e.g.:

/home/FooBar$ cd DragonPy_env
/home/FooBar/DragonPy_env$ source bin/activate
(DragonPy_env)~/DragonPy_env$ DragonPy

It is possible to start machines directly:

(DragonPy_env)~/DragonPy_env$ DragonPy --machine=Dragon32 run

more info:

(DragonPy_env)~/DragonPy_env$ DragonPy --help

There are several ways to install the project under windows.

The following is hopeful the easiest one:

• Install Python 3, e.g.: https://www.python.org/downloads/
• Download the DragonPy git snapshot from Github: master.zip
• Extract the Archive somewhere
• Maybe, adjust paths in boot_dragonpy.cmd
• Run boot_dragonpy.cmd

The default boot_dragonpy.cmd will install via Python Package Index (PyPi) into %APPDATA%\DragonPy_env

The is a simple "starter GUI", just call the cli without arguments:

%APPDATA%\DragonPy_env\Scripts\DragonPy.exe

It looks like this:

All needed ROM files, will be downloaded automatically.

The files will be downloaded from:

sbc09 and vectrex ROMs are included.

All ROM files and download will be checked by SHA1 value, before use.

You can run tests with PyPy, Python 2 and Python 3:

(DragonPy_env)~/DragonPy_env/src/dragonpy$ python -m unittest discover

or:

(DragonPy_env)~/DragonPy_env/src/dragonpy$ ./setup.py test

install coverage for python 2:

~$ sudo pip2 install coverage

...path/to/env/src/dragonpy$ coverage2 run --source=dragonpy setup.py test
...path/to/env/src/dragonpy$ coverage2 coverage2 html
# e.g.:
...path/to/env/src/dragonpy$ firefox htmlcov/index.html

"sbc09" ROM in Tkinter window:

"Simple6809" ROM in Tkinter window:

The keyboard mapping is stored into dragonpy/Dragon32/keyboard_map.py.

Some notes:

• "CLEAR" is mapped to "Home" / "Pos 1" key
• "BREAK" is mapped to "Escape" button
• "LEFT" is mapped to left cursor key and to normal backspace, too.

A "auto shift" mode is implemented. So normal lowercase letters would be automaticly converted to uppercase letters.

It is possible to paste the content of the clipboard as user input in the machine. Just copy (Ctrl-C) the follow content:

10 CLS
20 FOR I = 0 TO 255:
30 POKE 1024+(I*2),I
40 NEXT I
50 I$ = INKEY$:IF I$="" THEN 50

Focus the DragonPy window and use Ctrl-V to paste the content.

Looks like:

Then just RUN and then it looks like this:

+------------------+                         +---------------------+
|                  |                         |                     |
| +-------------+  |                         |       6809 CPU      |
| |             |  |                         |       +     ^       |
| |     GUI     |  |                         |       |     |       |
| |             |  | Display RAM callback    |    +--v-----+--+    |
| |  .--------------------------------------------+   Memory  |    |
| |  |          |  |                         |    +--+-----^--+    |
| |  |          |  |                         |       |     |       |
| |  |          |  |                         | +-----v-----+-----+ |
| |  |          |  |                         | |    Periphery    | |
| |  |          |  |     Keyboard queue      | |   MC6883 SAM    | |
| |  |          +--------------------------------->MC6821 PIA    | |
| |  |          |  |                         | |                 | |
| +--+-----^----+  |                         | |                 | |
|    |     |       |                         | +-----------------+ |
|    |     |       |                         |                     |
| +--v-----+----+  |                         |                     |
| |             |  |                         |                     |
| |   Display   |  |                         |                     |
| |             |  |                         |                     |
| +-------------+  |                         |                     |
+------------------+                         +---------------------+

The current implementation is not really optimized.

With CPython there is round about 490.000 CPU cycles/sec. in console version. This is half as fast as the real Hardware.

With PyPy round about 6.900.000 - 8.000.000 CPU cycles/sec. In other words with PyPy it's 8 times faster as the real Hardware.

e.g. The Dragon 32 6809 machine with a 14.31818 MHz crystal runs with: 0,895MHz (14,31818Mhz/16=0,895MHz) in other words: 895.000 CPU-cycles/sec.

1. implement more Dragon 32 periphery

missing 6809 unittests after coverage run:

• MUL
• BVS

Some Python/BASIC tools/scripts around Dragon32/64 / CoCo homecomputer.

All script are copyleft 2013-2014 by Jens Diemer and license unter GNU GPL v3 or above, see LICENSE for more details.

• PyDC - Convert dragon 32 Cassetts WAV files into plain text:
  • https://github.com/jedie/DragonPy/tree/master/PyDC
• Filter Xroar traces:
  • https://github.com/jedie/DragonPy/tree/master/misc

• Simple memory HEX viewer:
  • https://github.com/jedie/DragonPy/tree/master/BASIC/HexViewer

• Test CC Registers:
  • https://github.com/jedie/DragonPy/tree/master/BASIC/TestCC_Registers

/BASIC/InputOutput/keyboard.bas Display memory Locations $0152 - $0159 (Keyboard matrix state table)

Example screenshow with the "Y" key is pressed down. You see that this is saved in $0153:

Example with "U" is hold down:

• Grant Searle's Multicomp FPGA project:
  • Homepage: http://searle.hostei.com/grant/Multicomp/
  • own dragonpy/Multicomp6809/README
• Lennart Benschop 6809 Single Board Computer:
  • Homepage: http://lennartb.home.xs4all.nl/m6809.html
  • own dragonpy/sbc09/README
• Grant Searle's Simple 6809 design:
  • Homepage: http://searle.hostei.com/grant/6809/Simple6809.html
  • own dragonpy/Simple6809/README

Some links:

• http://www.burgins.com/m6809.html
• http://www.maddes.net/m6809pm/ - Programming Manual for the 6809 microprocessor from Motorola Inc. (now Freescale)
• http://www.6809.org.uk/dragon/hardware.shtml
• http://dragondata.worldofdragon.org/Publications/inside-dragon.htm
• http://koti.mbnet.fi/~atjs/mc6809/ - 6809 Emulation Page

Source codes:

• https://github.com/naughton/mc6809/blob/master/mc6809.ts
• https://github.com/maly/6809js/blob/master/6809.js
• http://mamedev.org/source/src/mess/drivers/dragon.c.html
• http://mamedev.org/source/src/mess/machine/dragon.c.html
• http://mamedev.org/source/src/emu/cpu/m6809/m6809.c.html
• https://github.com/kjetilhoem/hatchling-32/blob/master/hatchling-32/src/no/k/m6809/InstructionSet.scala

Dragon 32 resources:

• Forum: http://archive.worldofdragon.org/phpBB3/index.php
• Wiki: http://archive.worldofdragon.org/index.php?title=Main_Page

Some code based on:

ApplePy

An Apple ][ emulator in Python

• Author: James Tauber
• https://github.com/jtauber/applepy
• License: MIT

XRoar A really cool Dragon / CoCo emulator

• Author: Ciaran Anscomb
• http://www.6809.org.uk/xroar/
• License: GNU GPL v2

python-pager Page output and find dimensions of console.

• Author: Anatoly Techtonik
• License: Public Domain
• Homepage: https://bitbucket.org/techtonik/python-pager/
• Stored here: /dragonpy/utils/pager.py

srecutils.py Motorola S-Record utilities

• Author: Gabriel Tremblay
• License: GNU GPL v2
• Homepage: https://github.com/gabtremblay/pysrec
• Stored here: /dragonpy/utils/srecord_utils.py

dragonlib Dragon/CoCO Python Library

• Author: Jens Diemer
• https://pypi.python.org/pypi/DragonLib/
• https://github.com/6809/dragonlib
• License: GNU GPL v3

MC6809 Implementation of the MC6809 CPU in Python

• Author: Jens Diemer
• https://pypi.python.org/pypi/MC6809
• https://github.com/6809/MC6809
• License: GNU GPL v3

pygments generic syntax highlighter

• Author: Georg Brandl
• https://pypi.python.org/pypi/Pygments
• http://pygments.org/
• License: BSD License

• 24.08.2015 - v0.5.3:
  • Bugfix for "freeze" after "speed limit" was activated
• 20.08.2015 - v0.5.2:
  • Add run 'MC6809 benchmark' button to 'starter GUI'
  • bugfix 'file not found' in 'starter GUI'
  • change the GUI a little bit
• 19.08.2015 - v0.5.1:
  • Add a "starter GUI"
  • Add work-a-round for tkinter usage with virtualenv under windows, see: virtualenv issues #93
  • bugfix e.g.: keyboard input in "sbc09" emulation
  • use nose to run unittests
• 18.08.2015 - v0.5.0:
  • ROM files will be downloaded on-the-fly (.sh scripts are removed. So it's easier to use under Windows)
• 26.05.2015 - v0.4.0:
  • The MC6809 code is out sourced to: https://github.com/6809/MC6809
• 15.12.2014 - v0.3.2:
  • Use Pygments syntax highlighter in BASIC editor
• 08.10.2014 - v0.3.1:
  • Release as v0.3.1
  • 30.09.2014 - Enhance the BASIC editor
  • 29.09.2014 - Merge PyDragon32 project
• 25.09.2014 - v0.3.0:
  • Change Display Queue to a simple Callback
  • Reimplement Multicomp 6809 and SBC09
  • Many code refactoring and cleanup
• 14.09.2014 - v0.2.0:
  • Add a speedlimit, config dialog and IRQ: Forum post 11780
• 05.09.2014 - v0.1.0:
  • Implement pause/resume, hard-/soft-reset 6809 in GUI and improve a little the GUI/Editor stuff
  • see also: Forum post 11719.
• 27.08.2014 - Run CoCo with Extended Color Basic v1.1, bugfix transfer BASIC Listing with 8fe24e5...697d39e see: Forum post 11696.
• 20.08.2014 - rudimenary BASIC IDE works with 7e0f16630...ce12148, see also: Forum post 11645.
• 05.08.2014 - Start to support CoCo, too with 0df724b, see also: Forum post 11573.
• 04.08.2014 - Use the origin Pixel-Font with Tkinter GUI, see: Forum post 4909 and Forum post 11570.
• 27.07.2014 - Copyrigth info from Dragon 64 ROM is alive with 543275b, see: Forum post 11524.
• 29.06.2014 - First "HELLO WORLD" works, see: Forum post 11283.
• 27.10.2013 - "sbc09" ROM works wuite well almist, see: Forum post 9752.
• 16.10.2013 - See copyright info from "Simple6809" ROM with 25a97b6 see also: Forum post 9654.
• 10.09.2013 - Start to implement the 6809 CPU with 591d2ed
• 28.08.2013 - Fork "Apple ][ Emulator" written in Python: https://github.com/jtauber/applepy to https://github.com/jedie/DragonPy

• Send Bitcoins to 1823RZ5Md1Q2X5aSXRC5LRPcYdveCiVX6F