JSqueak -- Java implementation of the Squeak Smalltalk Virtual Machine

This is a fork of JSqueak.

JSqueak is a Java implementation of the Squeak Smalltalk virtual machine, originally developed by Daniel H. H. Ingalls.

Since the official site of JSqueak:
http://research.sun.com/projects/JSqueak

seems to be deprecated, this repository is forked from repository of Victor Rodriguez:
https://github.com/victorr/jsqueak

I have made some changes/improvements to the vm, now JSqueak can load and run a full version of Squeak 2.2 image, but it crashes easily.

Goals

Currentlly, this repo is for studying purposes.

I'm trying to add more primitive implementations to the vm to run a full version of Squeak 2.2

Notable changes / improvements:

• Fix floating-point number issue. Now JSqueak can read floating-point numbers from image file correctly. To verfiy this issue, try to move/resize the "Welcome to Mini Squeak 2.2" window (in mini.image).
• Reduce input lag by using a separate thread to notify input event.
• Beta support for Window resizing (Have to do "restore display" twice manually after resizing).
• Beta support for 8-bit color display (Also have to "restore display" manually).

TODO

• Add support for 16/32-bit color display
• More primitive implementations
• Performance optimization
• and more ...

Useful Materials & References

Here are some useful materials for studying Smalltalk

Squeak Official WebSite
https://squeak.org/

Pharo Official WebSite
https://pharo.org/

All history version of Squeak to downlaod
http://files.squeak.org/

For Squeak 2.2 and its VM implementation in C source code
http://files.squeak.org/2.2/2.2.tar.gz

Back to the Future The Story of Squeak, A Practical Smalltalk Written in Itself
The original paper of Squeak Smalltalk.
http://files.squeak.org/docs/OOPSLA.Squeak.html

Smalltalk-80: The Language and its Implementation (aka The BlueBook)
http://stephane.ducasse.free.fr/FreeBooks/BlueBook/Bluebook.pdf

codefrau/SqueakJS
An HTML5 runtime engine for Squeak Smalltalk written in pure JavaScript by Vanessa Freudenberg.
https://github.com/codefrau/SqueakJS

Potato VM
I found another fork/derivative of JSqueak named Potato, developed by HPI (Hasso-Plattner-Institut)
It is also mentioned in the Document of another fork repo: daitangio/jsqueak
Potato's project announcement: https://news.squeak.org/2008/07/07/potato-version-of-jsqueak-from-hpi/
its document: http://potatovm.blogspot.com/
and its source code at sourceforge: https://sourceforge.net/p/potatovm/code

Victor Rodriguez, the owner of which this repo is forked from, was also participated in Potato's development. See: AUTHORS

devhawala/ST80
A Smalltalk-80 virtual machine by Dr. Hans-Walter Latz. Based on the "Bluebook" specification, implemented in Java 8.
https://github.com/devhawala/ST80

dbanay/Smalltalk
A C++ implementation of the Smalltalk-80 system by Dan Banay
https://github.com/dbanay/Smalltalk

License

JSqueak was released under the MIT license (see https://news.squeak.org/2008/06/21/jsqueak-smalltalk-interpreter-written-in-java).