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    <p>I would recommend developing an operating system for the classic Amiga computers, which had different versions of the 68000 processor. Since the Amiga computer is a complete computer and is extremely well documented, I thought this would be a good exercise.</p> <p>There is an emulator for it called UAE (and Win-UAE) which is very exact and can be configured with different kinds of processors (68000 - 68060) and other capabilities. Normally, you would also need to acquire ROMs for it, but since you are developing an operating system yourself, this is not necessary.</p> <p>Tools you will need is either Cygwin (for developing under Windows) or a Linux computer. Then you will need cross compilers. This includes both a C compiler and an assembler. <a href="http://vmlinux.org/jakov/jumpstart/" rel="noreferrer">Here is a template</a> for creating a simple ROM which changes screen color and flicks the power LED. It will create a file 'kick.rom' which UAE then searches for in the current directory.</p> <p>Reference on the 68000 instruction set can be found at the links below. Be aware that different assembler programs may use slightly different syntax and instruction set.</p> <p>If you need to demo the operating system on real hardware, there are modern Amiga clones sold on Ebay and other places. Search for "Minimig".</p> <p>Update: Nowadays <a href="http://aros.sourceforge.net/download.php" rel="noreferrer">AROS</a> also runs on UAE as well as physical Amigas.</p> <p>Refs:</p> <p><a href="http://www.amigaemulator.org" rel="noreferrer">[UAE]</a><br/> <a href="http://www.winuae.net" rel="noreferrer">[WinUAE]</a><br/> <a href="http://cygwin.com" rel="noreferrer">[Cygwin]</a><br/> <a href="http://www.zerohero.se/cross/os3.html" rel="noreferrer">[Cross Compilers]</a><br/> <a href="http://www.tigernt.com/onlineDoc/68000.pdf" rel="noreferrer">[68000 reference]</a><br/></p>
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    1. POWriting an OS for Motorola 68K processor. Can I emulate it? And can I test-drive OS development?
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    1. COWhich hyperlink contains the ROM templates for changing screen color of flashing the power LED?
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      1. USmwcz
    2. COAdded link "Here is a template" to http://vmlinux.org/jakov/jumpstart/ @mwcz
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