Few people have heard of it, yet many consider John Blankenbaker's KENBAK-1 to be the first commercial personal computer.

Koss introduced these headphones over 40 years ago, and they remain affordable favorites to this day.

PowerLogix: New Life For Older PowerMacs

PowerlogixPowerLogix offers a series of drop-in processor replacements for Apple PowerMac G3 and G4 machines. Their PowerForce kits cost from $139 to $749.99, depending on your machine and the processor speed you're after. 

Their low-cost PowerMac 7300 - 9600 upgrades are the best bang for the buck. The $139 upgrade increases the processor speed by as much as 9X, to 900MHz. That should be sufficient to boost an aging machine to almost modern performance. Check them out; these are a great way to add a bit of rabbit to turtle-like systems.

PowerForce processor upgrades for Macintosh (PowerLogix)

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