Java Card OS operating system

Hi all.
I'm researching "How to build an Java Card OS". Any one can suggest me how to do it, which document i should read and follow. I read 3 specifications of JavaCard JCRE, JCVM and JCAPI but i still in fog.
Thanks all

hoaibaotre wrote:
Hi all, i have a BIG question. How can i implement JCVM by C with only JCVM Specification from SUN. I think that's not enough information to do. I read it but i didn't imagine the whole picture to do a JCVM.The JVM is just an interpreter that is able to execute byte code. It does not contain any libraries or other functionality. This is where the RE and API come in. These provide additional functionality so you do not need to implement it all in your applet.
One thing more, when we build a JCVM, that will go along with JCRE because it is really difficult to separate two issues.The JCRE contains the Java Card VM. From the introduction of the JCRE spec:
The Java Card™ platform, version 2.2.1 Runtime Environment contains the Java Card virtual machine (VM), the Java Card Application Programming Interface (API) classes (and industry-specific extensions), and support services.To have a complete JCRE, you need a JCVM and JC API. You can also add additional extensions to you JC RE/API by providing additional Java Card packages, which may use native code (similar to JNI) for interfacing with the card hardware directly.
Cheers,
Shane

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