This is an update to Gwilym Thomas' emulator as hosted at http://6809.uk
Since Gwilym originally published the emulator it has become apparent that there are some issues with both the compiler and the emulator. Unfortunately I've been unable to contact Gwilym, so I've just updated the code to fix issues myself
The revised emulator is hosted at http://6809.ukdragons.org.uk
A copy of the original wiki is hosted in the wiki for this repository
Some testing is implemented, currently enough to replicate
error scenarios and verify any fixes. To run the test
suite use the npm test script, or execute npx jest from
a command line in the root of the project.
To build the script bundle use the npm build script. This regenerates the build.js file under the dist folder. It also aggregates the solution into a single html file in the root folder.
Provided a build cycle has completed the emulator can be run as either the single file solution in the root of the folder or by opening index.html in the src folder. Both variants should work.
If you need to debug the solution it is vital to set the webpack.config.js file to use the development mode instead of production. This prevents obfuscation and minification of the source scripts.
- The compiler attempts to resolve relative branching within a fixed two pass execution which results in some offsets being incorrect. Temporary fix applied by extending to three passes but this needs revisiting to dynamically adjust the number of passes to allow offsets to settle (or error if oscillating indefinitely)
- Data literals have issues with handling of strings and when the literal contains a match with a label or mnemonic token. Until fixed make sure labels end with a ":" to help differentiate