You may attempt to load the latest Dev Alpha B update onto your Dev Alpha A, however the Dev Alpha A is no longer officially supported as of 10.1.0.1485.
If you encounter any issues, downgrade to 10.0.10.263 using the Autoloader method. The 10.3 SDK OS (10.3.0.442) is also being made available to those developers who would like to test on their Black Berry 10 device.
This is the oldest version of OS X that still has a few relatively up-to-date browsers to choose from, although recent browsers such as Camino 2 and Firefox 3 are not compatible with it.
Opera 9.6 and i Cab 4.6 are the last versions compatible with Panther.
Minimum hardware requirements are a 233 MHz G3, a built-in USB port (requires “New World” ROMs), 1.5 GB of available hard drive space, and 128 MB of RAM, although more is recommended. Panther was the first version of OS X to drop support for some of the oldest Macs that had been supported through 10.2.x.