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