****************************************************************************
******************************************************************************
**                                                                          **
**  Copyright (c) 2012 by Andrea Griffini                                   **
**                                                                          **
**  Permission is hereby granted, free of charge, to any person obtaining   **
**  a copy of this software and associated documentation files (the         **
**  "Software"), to deal in the Software without restriction, including     **
**  without limitation the rights to use, copy, modify, merge, publish,     **
**  distribute, sublicense, and/or sell copies of the Software, and to      **
**  permit persons to whom the Software is furnished to do so, subject to   **
**  the following conditions:                                               **
**                                                                          **
**  The above copyright notice and this permission notice shall be          **
**  included in all copies or substantial portions of the Software.         **
**                                                                          **
**  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,         **
**  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF      **
**  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND                   **
**  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE  **
**  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION  **
**  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION   **
**  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.         **
**                                                                          **
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6502 Javascript emulator.

Not an interpreter, but a JIT compiler to Javascript.

Includes a 6502 disassembler and a small assembler.

Now with partial support of self-modifying code. Memory can be modified
in MANY ways (including PHA or JSR) and code can be anywhere. Now it works
only if the memory change is done using STA, STX, STY, INC or DEC.