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Javelin 2? — Parallax Forums

Javelin 2?

jmspaggijmspaggi Posts: 629
edited 2008-08-16 12:38 in General Discussion
Hi,

When will the Javelin 2 been released?

In a perfect world, it would have twice the speed of the Javelin 1, twice the memory, twice the number of pins, and able to handle more VP.

Do you (Parallax) have a project to improve the Javelin and provide an upgraded version? Or is there nothing plan yet?

Thanks,

JM

Comments

  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2008-08-12 21:03
    Never.
    I have emulated the javelin using the propeller. Especially the spinstamp
    because of its identical footprint. See this thread:
    http://forums.parallax.com/showthread.php?p=703261
    The idea was to allow other types of VP's to be used, as well as the
    existing ones. Although the jvm implemented on the propeller does
    work, the results are not very satisfying. The javelin outperforms
    the propeller running the jvm written in spin. Even if the jvm is
    written in assembly I very much doubt if it ever can compete with
    the javelin performance.

    regards peter
  • jmspaggijmspaggi Posts: 629
    edited 2008-08-13 14:43
    Hi Peter,

    Thanks for you reply. I red and I admit I got some troubles to understand everything [noparse];)[/noparse]

    So does it mean there will be no more development of new microcontrollers?

    JM
  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2008-08-16 08:25
    I think we must await the propeller II. That should have 256kB ram, 16 cogs·and 64 I/O ports.
    The amount of memory available is then sufficient to implement the jvm using
    the Imagecraft C compiler. You will be able to use the Javelin IDE. The only
    drawback will be that it will not fit on a 24pin dip module.

    regards peter
  • jmspaggijmspaggi Posts: 629
    edited 2008-08-16 11:30
    Hi Peter,

    That sound very good. The drawback regarding the dip module is not a big issue since I'm using my Javelin directly from the Javelin Demo Board. I will have just to replace it also.

    Regarding the memory, why we need more memory to use the ImageCraft compiler? Is it going to take more? Because if it generate classes bigger which take 4 time the space, then it's pretty the same as what we have today with the Javelin.

    Also, is there a forum to see how Propeller II is going? I found that http://propeller.wikispaces.com/Propeller+II but it does'nt give more information regarding the potential release date.

    Thanks,

    Jean-Marc
  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2008-08-16 12:38
    The current prop jvm implementation sets aside 16kB for java bytecodes, 12kB spincode
    and 4kB assembly. From what I've read spin converted to C requires 1.5* spin code size.
    If we set aside 64kB for java bytecodes (maximum that can be addressed with 16bit pointers)
    that leaves 192kB for C code, assembly and some emulated memory devices.

    regards peter
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