PalmOS Version-o-Rama
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PALM OS 3.3
While improvements to the operating system were being
steadily released on new devices, it wasn't until OS 3.3
that Palm delivered on the promise of upgradeability by
widely releasing an OS upgrade kit. Appearing on the
Palm Vx and available as a free downloadable upgrade, OS
3.3 included all the improvements in previous versions,
as well as full OS support for the 16-shade grayscale
capabilities of all modern handhelds (the original Palm
III and original Pilot and PalmPilot models only support
4-shade grayscale). While some programs had managed to
add limited 16-shade grayscale support by directly
manipulating the Palm hardware, OS 3.3 added support for
the extra shades in all the system drawing, text, and
interface routines, allowing more complex apps to easily
support them as well.
Oddly enough, development on OS 3.3 reportedly ended
with its release. Possibly due to scheduling challenges
in releasing the Palm IIIc on time, OS 3.5 was instead
developed based on the code of earlier versions, and was
probably developed in parallel with OS 3.3. While 3.5
duplicates all the additions found in 3.3, this has the
odd side-effect of leaving OS 3.3 an "orphan" OS of
sorts. While not generally an issue, there have been
rare reported conflicts, crashes, or other unintended
"features" with some apps running under OS 3.3 that does
not occur on earlier or later OS versions due to the
differences.
PALM OS 3.5
A gargantuan improvement to Palm OS came with the
premiere of OS 3.5 on the Palm IIIc. Swelling in size
from roughly 1.2 Megabytes to about 1.7 Megs, 3.5 was
chock full of internal additions and modifications to
the drawing routines to support color. For the first
time, it also had real interface improvements, including
a new pop-up icon bar for menu items, larger alarm
dialogs, and masked record support.
Under the hood, other changes included a new
Notification Manager to allow future programs to react
to system-wide events, such as a wireless antenna being
raised or the display mode changing.
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