The Power Macintosh Upgrade Card can't be used in Macintosh IIvx, IIvi, and Performa 600 computers, contrary to an article in the June 1994 edition of Macworld magazine. Apple released this statement relating to their PowerPC-based accelerator card (designed for use in the PDS slot in several '040 Macs), noting that these models can be upgraded to a Power Macintosh 7100/66 or 7100/66AV model through a logic board upgrade. [MHA]
Mac OS X Zip Expanding Utility
Firefox (and possibly other applications) may ask you what you want to do with .zip archives that you download from the Internet. If you want to expand them with Mac OS X (rather than StuffIt Expander), you may be unsure of which application actually does the job. You're looking for Archive Utility (in Leopard and later) or BOMArchiveHelper (in Tiger). In either case, the application is stored in Hard Drive/System/Library/Core Services/. Don't move it from there, though, or you'll confuse matters.