Taurus Java Virtual Machive v0.10a DEMO
The following release notes are applicable to the above version of the Taurus Java Virtual Machive. The copyright notice is applicable to any version of the VM unless stated otherwise.
Copyright noticeTaurus Software hereby grants you a non-exclusive, non-transferable limited licence (without the right to sub-licence) under Taurus Software's intellectual property rights. The licence entitles you to freely use, for personal, non-commercial use only, but not to distribute, the Taurus Java Virtual Machine. All binaries and code remain exclusively copyright Taurus Software.
The Taurus Java Virtual Machine has been produced, as a "clean room" implementation, in accordance with Sun Microsystems, Inc.'s (SUN) licence agreement for "The Java Virtual Machine" specification. In accordance with this agreement the virtual machine distribution does NOT, to the author's knowledge, contain ANY material which is copyrighted by SUN. As such the class files relied upon by the virtual machine must be obtained separately, directly from SUN. The use of this specifcation does not in any way imply that the software conforms to it, nor does it imply that it will ever wholey do so. The Taurus Java Virtual Machine does not, and will not, ever pretend to be "Java compliant", it will always remain as closer approximation as time and money will allow. Users of this software do so at their own risk. Developers of any Java software should NEVER use this as a reference platform.
Taurus Java Virtual Machine is a trademark of Taurus Software. Sun, Sun Microsystems, the Sun logo, Java, JavaSoft are all trademarks or registered trademarks of Sun Microsystems, Inc. All other product names mentioned herein are the trademarks of their respective owners.
THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRIGEMENT. TAURUS SOFTWARE ACCEPTS NO RESPONSIBILTY FOR ANY DAMANGE, OF ANY KIND, CAUSED BY THE USE, OR MIS-USE OF THIS SOFTWARE. BY USING THIS SOFTWARE YOU AGREE TO THE LICENCING TERMS HEREIN.
TAURUS SOFTWARE RESERVES THE RIGHT TO REVOKE THIS LICENCE AT ANY TIME, FOR ANY REASON. THE "FREE" STATUS OF THIS SOFTWARE IS TEMPORARY, DUE TO THE TIME AND EFFORT DEVOTED TO THIS PROJECT IT IS LIKELY TO BECOME "SHAREWARE", BUT IS UNLIKELY TO BE MADE INTO A COMMERCIAL PRODUCT.
All references to Taurus Software directly refer to the non-profit freeware/shareware software development unit run from the UK by myself. Any conflict with names of companies inside or outside of the UK is unintentional and should be disregarded.
Platform SupportThe Taurus Java Virtual Machine version 0.10 alpha demo is provided in binary form only for the following platforms:
Java SupportThe demo release provides a very limited subset implementation of the SUN Java Virtual Machine Specification. The key features of this release are as follows:
Windows InstallationUnpack the downloaded ZIP file containing the VM into a suitable directory (e.g.
C:\JavaVM). The VM executable is called
the classes it loads are in the subdirectory
classes. Run the VM from
this directory (it looks for the classes directory relative to where you start it!).
SIBO InstallationUnpack the downloaded ZIP file containing the VM into a temporary directory (e.g.
C:\Temp). The VM executable is called
the subdirectory img, and the Java classes it loads are in the subdirectory
Copy the executable into the
To start the VM you need to use
Minimum requirementsThe VM can function in a much smaller environment than provided by the JDK classes. The VM really only needs the following class and methods to function:
The classes provided with the VM implement some very basic functionality:
To make your own environment, you need to implement a set of Java classes similar to those
provided by Sun. The main reason for doing this on a small platform is the amount of crap
that gets loaded before any of your classes. I am currently looking at the Personal Java
and Embedded Java specifications for some ideas on how to shrink the VM -
Memory and diskspace requirements are as follows:
SupportThe VM is offered with no warranty and no support. I cannot guarentee it will run on your machine, and any programs written specifically to run on the Taurus VM are not guarenteed to run on future versions.
Missing features, bugs etc. will be fixed as part of the porting procedure, so keep checking the website for updates.
FeedbackThe primary reason for releasing such an early access demo is to get feedback aimed at getting the features you want working on the platforms you want. The demo is VERY RESTRICTIVE I know, but most of the core functionality is in place, it really only remains to finish porting the VM instruction set (mainly conversion from ANSI to K&R C) and native methods (which mostly require a re-write).
Please feel free to send any CONSTRUCTIVE comments to support.
Appendix IThe following instructions are implemented by the demo VM:
All other instructions will cause the VM to exit and report the error
Last updated 9th May 1999