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+This file is a textual log of changes by date prior to tracking the
+files in a public version control repository. This is for historical
+purposes only, and will no longer be updated.
+
+--------------------------------------------------------------------
+
+2011-12-06
+Added PEEK and POKE shim for 230 (Hi-Res plotting page), to enable
+drawing on the back buffer for animations.
+
+2011-04-20
+Re-added support for running under Windows Scripting Host and added
+Mozilla Rhino support too.
+
+2011-04-16
+Total internal revamp: Now a compiler rather than interpreter. Source
+errors are reported by BASIC line number as well as source
+line/column.
+
+Display defaults to 40 columns, emulates 80-column firmware more
+accurately. Character output (CHR$(), INVERSE, etc) tweaked to match
+Apple behavior.
+
+Files written via DOS now persist in your browser via Web Storage.
+
+Floating point and integer overflows are caught rather than
+propagating infinities and NaNs.
+
+DATA statements and INPUT entries parse more accurately as comma
+delimited, optionally-quoted strings. RE-ENTER? is shown on invalid
+INPUT (and can be trapped via ONERR)
+
+Added HGR2 and page-flipping POKE shims, plus a few CALL shims for
+graphics. Hires graphics are now to a 280x192 bitmap, rather than
+trying to be sneaky with a 140x192 bitmap.
+
+Error codes can be distinguished in ONERR via PEEK(222). Out-of-memory
+and stack-overflow conditions reported where possible (this is
+non-standard across browsers).
+
+Tweaked samples that were dependent on language/environment quirks.
+
+Updated code editor to (the much improved) CodeMirror 2.0. On parse
+errors, the cursor is moved to the offending line/character.
+
+2011-01-29
+Fixed error handling issues, e.g. DOS errors w/ ONERR and syntax
+errors e.g. 10 INPUT PRINT
+
+Added HSCRN(x,y) extension function.
+
+Fix mouse-as-joystick to hit full range of 0...255.
+
+2011-01-26
+No longer show paddles/joysticks automatically; rely on
+mouse-as-joystick primarily.
+
+Use FlashCanvas for older IE versions, instead of excanvas, and switch
+to plotting hires pixels/lines directly rather than relying on canvas
+scaling and line drawing.
+
+Added Gaussian Distribution 2D plot sample, by John Russ
+
+2011-01-25
+Added compatibility shims for PEEK(78) and PEEK(79) for seeding the
+random number generator. On a real Apple these are incremented during
+the input polling loop and are a good source of entropy for seeding a
+random number generator. In this interpreter, they are simply
+generated by the JavaScript Math.random() function.
+
+2010-11-21
+Added lexical highlighting in code editor via CodeMirror. Note that
+this only highlights tokens, it does not check statement or expression
+syntax. It will highlight invalid tokens and unsupported statements.
+
+Mousing over the screen now updates paddle position - try the lo-res
+painting demo for an example.
+
+Lots of internal code cleanup with hopefully no behavior changes.
+
+2010-11-18
+Fix RETURN and POP from inside a FOR ... NEXT loop.
+
+Fix TRACE and NOTRACE
+
+2010-11-13
+Added SPEED= shim (does nothing)
+
+Fixed SPC() and TAB()
+
+Work around Chrome bug to show full error alert text.
+
+2010-08-29
+Added "Echo to Printer" option to allow copy/paste of output
+
+Big refactor of internals. Statement parsing and execution now
+separated. A library of statement functions are used for
+execution. Hopefully nothing broke - all unit tests still pass.
+
+2010-05-04
+When run under cscript.exe, the program still blocks until the user
+presses Enter when a GET statement executes, but the entered
+characters are returned by subsequent GET statements.
+
+Added Hello World Sine Wave sample by Jamie Beu.
+
+2009-11-01
+Changes are now recorded in an Atom Feed.
+
+2009-10-24
+Now licensed under the Apache 2.0 license
+
+2009-10-15
+Fixed bug with POKE and negative addresses (introduced 2009-05-15, bleah)
+
+2009-06-10
+Added Boy's Surface sample by Lukas Innig
+
+2009-05-08
+Fixed running with cscript
+
+Slight performance tweaks for IE c/o explicit sizing
+
+2009-05-08
+Tracked down source of IE perf issues when drawing with paddles; when
+the thumb/stick moves, IE does a relayout/repaint of any content above
+the paddle in the HTML flow. If I delete the page header it's
+silky-smooth. Unfortunately, any text above the screen seems to make
+it fall off the deep end - so no fix yet without gutting the page.
+
+Undid "Line breaks from PRINT now clear to the right edge" - doesn't
+repro on Apple. What was I thinking?
+
+2009-05-06
+A bunch of performance tweaks based on IE8's JavaScript
+profiler. While they look good on paper, they mean diddly-squat to
+perceived performance. Don't precalc default variable values, avoid
+DOM changes that are no-ops, and (sigh) don't scan the whole screen
+looking for FLASH-styled cells - maintain a list instead so perf isn't
+impacted if there are none.
+
+2009-05-01
+Expressions are now just-in-time compiled to JavaScript. Screen
+updates are the real bottleneck, though, so this isn't a big
+performance boost. Performance comparison (on my 1.73GHz machine) of
+the lores Mandelbrot set demo:
+
+Google Chrome (V8 JavaScript compiler): 25% faster (21s vs. 27s)
+Firefox 3: 14% faster (64s vs. 73s) Internet Explorer 8: <1% faster
+(249s vs. 251s) So not a huge win except on faster execution
+engines. But this is just the first step...  Fixed POKE 216,x shim to
+disable ONERR handler
+
+2009-04-30
+Rejiggered internal value storage/passing system to use fundamental
+JavaScript types instead of {number: value} or {string: value}. I
+didn't trust JavaScript's type system when I first wrote this code.
+
+2009-04-26
+Performance - made GOTO/GOSUB not do a linear scan to find the line
+(d'oh). Significant perf boost for IE.
+
+Added Unit Tests sample. Coverage is not complete but it's getting
+there.
+
+RND() with negative now consistently reseeds (added custom pseudoranom
+number generator)
+
+FOR I = 10 TO 1 : PRINT I : NEXT now correctly prints 10 then finishes
+(was previously incorrectly inferring STEP -1)
+
+2009-04-25
+Line breaks from PRINT now clear to the right edge of the text window
+
+Automatically show input devices if PDL() called
+
+Added Zhodani Relay Station Placement example (run after generating a
+sector with Traveller Sector Generator)
+
+2009-04-24
+Fixed a bug where changing text mode (e.g. PR#3) after calling HGR
+would break split-screen mode.
+
+2009-04-14
+Updated to an IE8-compatible version of excanvas. Updated my excanvas
+patch to support scaling.
+
+2009-04-05
+Allow DEF FN to be invalid (errors occur in FN, per Applesoft)
+
+Fixed PR#0 in Safari
+
+Added RENAME old,new to DOS
+
+Fixed LIST for assignment statements with no LET
+
+Fixed operator spacing for LIST
+
+Fixed parsing of empty REM statements
+
+Program would execute after a tokenization error was encountered -
+fixed.
+
+Added Traveller Sector Generator sample
+
+2009-03-07
+Fixed cursor blinking
+
+Added Connections, Puzzler, and Squiggle by Gregg Buntin
+
+2009-03-06
+Addressed IE performance issues: sped up Text and LoRes screen
+initialization, don't use classes for characters (sigh).
+
+Fixed PRINT SPC()
+
+2009-03-05
+PRINT CHR$(7) now rings a BELL (if your browser has an audio/wav WAV
+handler configured)
+
+Reimplemented the text display (TTY) using bitmap font, to mimic the
+look of 40/80 column text (no more copy/paste, alas)
+
+Added MouseText support. INVERSE:PRINT CHR$(27);"XY";CHR$(24):NORMAL
+
+The ASCII Pac-Man sample was really Unicode Pac-Man, which the bitmap
+font doesn't support, so it broke. So I cheated.
+
+2009-03-01
+Added Scribble sample, by William Simms
+
+2009-02-12
+Added February Surprise sample by Antti Pirskanen
+
+2008-11-08
+Ignore whitespace-only lines, as a convenience
+
+Added ASCII PAC-MAN(ish) sample by Michael Kemp
+
+2008-10-19
+Added TEXT ADVENTURE sample by Floyd McWilliams.
+
+Allow string literals to be terminated by end-of-line (suggested by
+Mike Kienenberger for compatibility)
+
+2008-09-18
+Fixed a case where syntax errors were ignored
+
+2008-09-17
+Fixed input focus to work in Google Chrome
+
+Fixed READ to support multiple variables, e.g. READ I,J,S$
+
+2008-08-23
+Added Save/Load buttons that let you save your work to a cookie
+
+Added DRAWING PROGRAM sample by Brian Broker
+
+Fixed power operator (^) which wasn't being parsed correctly
+
+Fixed subtle bug with string comparisons (result was double-typed as
+number and string)
+
+2008-05-01
+Fixed NEXT I,J,... to terminate multiple loops - thanks to Scott
+Alfter for pointing this out
+
+Bowing to popular demand, it now supports ? as an alias for PRINT
+
+2008-03-15
+Implemented ONERR GOTO line and RESUME, including POKE 216,0
+
+Added demo for ONERR, added ONERR support to sequential file access
+demo
+
+Fix hires graphics on Safari - not sure when it broke
+
+2008-03-14
+Code cleanup c/o jslint.com
+
+Bug fix: INPUT A,B,C no longer worked. Probably mis-re-factored at
+some point.
+
+2007-12-08
+Implement file writing (to client-side VFS only), including APPEND
+operations
+
+Added DOS DELETE command
+
+GR does implicit HTAB 1 : VTAB 24
+
+PEEK(49168) has the same effect as POKE 49168,N
+
+As a convenience, PEEK and POKE at 49200/-16336 (speaker toggle) now accepted, but a no-op
+
+As a convenience, spaces now accepted before = forCOLOR= and HCOLOR=
+
+2007-11-22
+Added button to submit your sample (via email) for inclusion
+
+Added SIMPLE.PONG sample c/o USENET post by mad.scientist.jr
+
+Improved comment handling (doesn't tokenize)
+
+2007-10-22
+Make GET support keyboard flag, so IF PEEK(-16384) > 127 THEN GET A$
+works
+
+2007-10-20
+Bug fix: User could type after hitting Stop. Now TTY state is reset.
+
+Added missing statement: ON expr GOSUB ...
+
+RND(0) returns last, negative reseeds
+
+2007-10-14
+Fixed location of paddle button 3 (C060)
+
+2007-09-22
+Implemented scaling in ExplorerCanvas (source); hires now scaled
+somewhat correctly in IE
+
+Bug fixes: HOME would force full-screen text; HPLOT can now plot a
+single pixel
+
+2007-09-20
+Added hires support via canvas tag
+
+Display switches (POKE 49232...49239, not counting page 2) supported.
+
+Added text window support: POKE 32,left : POKE 33,width : POKE 34,top
+: POKE 35,bottom
+
+2007-09-16
+Added full screen lores support via POKE 29234,0
+
+Fixed keyboard input on Safari - hacky, but logical
+
+2007-09-15
+Added Mandelbrot set demo to DEMOS
+
+Added PEEK and POKE shims
+
+Added paddle buttons: Home = 0 = Open Apple, End = 1 = Solid Apple,
+Page Up = 2, Page Down = 3
+
+Added Caps Lock (defaults to on; real Caps Lock key toggles it; this
+means it usually ends up in an inverted state)
+
+Round numerical results to 8 decimal places (hacky)
+
+2007-09-10
+Added demo file links, cleaned up UI a bit.
+
+Added hacky PR#0/PR#3 support (to set 40 columns)
+
+2007-09-09
+Execute multiple steps before yielding. Increases perceived
+performance by about 10x.
+
+Adjust lores colors per Linards Ticmanis on comp.sys.apple2.
+
+Added Joystick, reorganized web pages
+
+2007-09-04
+Added MON/NOMON support.
+
+Fixed bugs with: READ into arrays, two argument MID$, e-format number
+parsing, DOS null command
+
+2007-09-03
+Bugfixes: SPC() and TAB() followed by ; in PRINT statements. DOS
+parameter lists can include spaces.
+
+2007-09-02
+Oops - FRE is a function not a statement. Fixed!
+
+2007-09-01
+Implemented DATA/READ/RESTORE
+
+2007-08-31
+Implemented DEF FN
+
+2007-08-30
+Implemented DIM. File reads complete.
+
+2007-08-27
+Added preliminary DOS implementation. Sequential access read only;
+there's a file called "JABBERWOCKY" to try.
+
+2007-08-24
+Fixed bugs with string variables, key presses in IE, and HTML tweaks
+for better layout and lo-res sizing
+
+2007-06-05
+Added paddle support (PDL)
+
+2007-06-03
+Added lores graphics support (GR, PLOT, HLIN, VLIN, COLOR=, SCRN)
+
+2007-05-01
+Extracted step mechanism from interpreter, so web page can introduce
+delays; no longer case-sensitive to keywords
+
+2007-04-29
+Fixed command-line mode again
+
+2007-04-27
+Added screen emulation (e.g. HOME, HTAB, VTAB) and input (e.g. GET)
+
+2007-04-24
+Integrated into browser (display and event model)
+
+2007-04-21
+Project started; interpreter functional via WSH on Windows