Well,
I was wondering if 10.4 or even 10.5 will work on my computer:

Amd athlon XP 2200+ 1,8Ghz only SSE
2 gb SD-RAM
HIS HD2600XT
ECS k7sem mainboard

No, need minimal SSE2 requirements, sorry.

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hack1 = Mac OS X Snow Leopard 10.6.2 Build 10C531
hack2 = Mac OS X Server Snow Leopard 10.6.1 Build 10C504
iBook G3 DualUSB = Mac OS X Jaguar 10.2.8 Build 6R73
MacBook 403LL/A = Mac OS X Snow Leopard 10.6.2 Build 10C531
iPhone 3G = iPhone OS 3.1.2 Build 7D11 Baseband 05.11.07 Bootloader 05.09 [G2M3S2] ClaroBR 5.0