Q: Best OS
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May 10, 2015 3:24 PMby dalstott,HelpfulYou can go as far as 10.4.11 which would give you the best chance to use somewhat modern software. Also you can use classic environment which will allow software compatible with OS 9.2.2 to be used.
http://en.wikipedia.org/wiki/Classic_Environment
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May 11, 2015 9:51 AMby dalstott,RE; the best for speed
While these old classic Macs are fun in a hobby sort of way as they aren't capable of running any modern programs. Speed is not much of an issue as even if you made it twice as fast it would still be woefully slow. Here are some links you may want to read.
http://lowendmac.com/ed/moore/08cwm/best-os-ibook-powerbook.html
http://lowendmac.com/2014/low-end-macs-compleat-guide-to-clamshell-ibooks/
http://lowendmac.com/2009/is-it-worth-maxing-the-ram-in-old-g3-and-g4-macs/
http://lowendmac.com/2009/optimized-software-builds-bring-out-the-best-from-your -mac/
