JSSpeccy: A ZX Spectrum emulator in pure Javascript
===================================================
by Matt Westcott <matt@west.co.tt>

- A Spectrum emulator? In Javascript?
Yes.

- Why?
As a birthday gift to Princess Ragnhild of Norway.

- Really?
No.

Features
--------
* 48K Spectrum emulation
* Most documented and undocumented Z80 behaviour
* A screen with a border
* Keyboard scanning
* SNA snapshot loading
* TAP tape image loading
* Erm...

Notable non-features (don't hold your breath):
----------------------------------------------
* 128K (and later models)
* Sound
* Z80 / TZX / any other exotic file formats
* ULA effects (multicolour / contention)
* TV dot crawl
* Your mum shouting that your tea's ready

Requirements
------------
Any browser supporting the <canvas> element (which include Firefox, Opera,
Chrome and Safari) should work. Browsers supporting the putImageData method
(which include Firefox and Opera) will be somewhat faster.

Instructions
------------
Open jsspeccy.html. Click on 'run'. Double click on a snapshot filename.

Build instructions (aka 'how to add more games')
------------------------------------------------
If you're on a browser that supports getAsBinary on file inputs, you can
use the file upload box, and you're laughing. Unfortunately, at the time
of writing this is Firefox 3.5 and nothing else.

For other browsers, snapshots have to be compiled in - put your .SNA
files in the 'snapshots' directory, then run 'make'. This will compile
them into the file snapshots.js (as well as doing some other stuff:
compiling roms into roms.js, and rebuilding the Z80 core from bits of
perl and C preprocessor and bits of string). You need Make and Perl for
this.

Acknowledgements
----------------
The Z80 core and unit tests were ported from Fuse:
	http://fuse-emulator.sourceforge.net/
ExplorerCanvas is packaged in the hopes that this might some day run in
Internet Explorer, but don't count on it:
	http://excanvas.sourceforge.net/

                                  Matt Westcott 2009-11-21
                                  http://matt.west.co.tt/