@Spud
Hi Matt,
Just to add a *lot* to Mikey_c's reply.
1. Yes Amiga inc, who sort of fell out of the ashes of Commadore, though they say they did not (it's very complicated!), are in court in the USA with Hyperion, who wrote OS4, and no-one really knows how it will pan out. Amiga Inc are not the flavour of the month due to a lot of history which you can read about on the net if you like.
2. OS 4 does require a powerPC processor (often abbreviated to PPC) and either an amigaOne (rare) or PPC board that plugs into a 'Classic Amiga (very rare). Oh classic amiga's are those made by Commadore and a few others, they are A500's (like yours) A1200's A1500's A4000's etc. It will not work on a PC or Mac. OS4 will not work on your A500 either.
However it is not all bad news, especially of you want to bin windows. Two projects spring to mind. The first is UAE. This is a piece of software that emulates the classic Amiga on a PC, Mac and a few others (?). It forms the basis of Amiga Forever and you can buy a copy of this from cloanto at
http://www.amigaforever.com/ . It comes with everything you need to run a vast array of classic programmes on a pc, I am not sure of a Mac version. You do need Windows - but see below - or their mini install of Linux to use it and it is not perfect... Then again its not at all bad. If you want to support development buy a copy.
Once you have you can tweak it like mad by downloading (and donating to) amikit -
http://amikit.amiga.sk/ (10,000 downloads and counting) or amigasys -
http://amigasys.extra.hu/winuaefeature.html. Both of which accept the amiga forever cd and add patches to the software to make it a very usable environment on a windows pc (and now Linux)
The second project is Aros. This is an attempt to produce a pc (and other) native version of OS3.1. Its now got an installer and will also run as a hosted OS on Linux. Work is under way to produce a version of UAE for it. Check out the latest here.
http://aros.sourceforge.net/ Once this is complete you will be able to run classic programmes in uae on Aros without a sign of windows. You can do this now on linux using uae, or E-uae (which is a port of the windows version - info here -
http://www.rcdrummond.net/uae/ )
Aros is under test on A cube's Sam 440Ep (news here -
http://www.acube-systems.biz/eng/index.php ) as is Ubuntu - a version of Linux. So if all goes well you will not need a pc at all.
There are 2 hardware projects out there that you might like to look at as well. The minimig is an attempt to get all the special hardware of an A500 into a single chip. A cube were selling these, and the last time I looked they had sold out. The other is a slightly mad(?) project to produce a new A1200 look/work-alike called the Natami - check it out here -
http://www.natami.de/ . Opinions vary as to how successful it will be.
Finally there are still companies who cater for people with amigas - not sure what is available for the A500 but one such is Amigakit, their website pops up in place of Eyetec's - who were the people who developed the AmigaOne...
http://amigakit.leamancomputing.com/catalog/amiga-shop.phpCheers
J.