Apple ][js and //jse
What is this?
RAMFactor Emulation (//jse)
I now simulate having a 1 Megabyte RAMFactor card in slot 2.
Thunderclock Emulation (//jse)
There is cursory emulation of the Thunderclock card, enough
to keep ProDOS applications from asking you to enter the date
all the time. ProDOS attempts to guess the year from the month,
the day and the day of the week, something that needs to be
patched every 6 years. This means newer versions think it's 1996,
older versions are stuck in the 80s.
Firefox Nightly Joystick Support
Joystick support has yet to officially land, but the latest
nightlies support the gamepad API.
I've switched from using setInterval() to requestAnimationFrame() where
supported. This, in conjunction with the graphics re-write, seems
to smooth performance and provide a more stable CPU speed.
This (third) re-write of the graphics system should improve performance
with graphics intensive programs. Rather than rendering each graphics
update as it happens, updates are rendered each animation frame.
After much flailing, and much staring at MMU emulation code in
despair, I've finally published my Apple //e emulator. It's probably
a little more rough than I'd hoped, but it has a lot of features
that I really wanted to get into it, like basic double hires support,
and it uses the enhanced Apple //e ROMs.
Chrome only so far, the nascent gamepad API has finally allowed me
to add basic joystick support. I can now re-live my glory days
Re-written CPU emulator
I finally got around to applying some of the many lessons I learned
last re-working gave me about a 100% performance gain.
Finally Fixed Oregon Trail
This seems to have been a major disappointment for many people.
I was able to make it as a banker, but I'm embarassed to reveal my
Now in addition to
Apple2JS, there's a couple of new kids on the block, including
David Caldwell's Apple II+
emulator where he's put a lot more thought into the graphics rendering
than I have, and
which I just stumbled across while looking for David's emulator and
haven't had much time to look at.
A Browser with HTML5 Support
The most recent versions of
all seem to work reasonably well these days, although
variations in HTML5 support pop up, and occasionally a major release
will move things around out from under me.
IE prior to 9 lacks canvas tag support and is unsupported.
IE 9+ renders nicely on
a modern machine.
In updating this section I realized just how long
I've been doing this, since I used to have to specify Firefox 3+ and
Google Chrome 5+, and I'm now running Chrome 23 and Firefox 19.
Basic Knowledge of the Apple ][
If you don't know how to use an Apple ][, this won't be much fun for
any Flash audio plugins. Most reputable browsers
now provide some sort of audio API, but no standard really seems to have
emerged. I should probably add a volume control.
Poor Printer Support
I currently only support sending text characters to a separate window.
I'm using the following libraries:
I heavily referenced:
And special thanks to:
for allowing me to pull some of my circa
1980 programming efforts off some ancient floppies.
KEGS, because at some
point I got so tired of futzing with ADC/SBC code I just ported
worrying about it.
Apple II History,
for a lovely, informative site.
for the kick in the pants to finally post my version, once I
realized there was, in fact, another apple2js in the world.