If this sort of thing tickles your fancy, then have a look at <a href="http://www.fpgaarcade.com" rel="nofollow">http://www.fpgaarcade.com</a><p>Several implementations of classic arcade games and home micros are available, and Mike is just finishing up a board for these sort of projects.
On the World of Spectrum forums there's been some interesting posts on Spectrums that are slowly dying. For those that don't know, the ULA was a custom chip and can't be replaced. FPGA technology allows the spectrum to live on in an (albeit emulated) hardware form.
Dang! I should have archived the source to the Sega FPGA system I made as a senior design project. At the time, it required a relatively expensive FPGA, but that was a decade ago; it would probably fit on an el-cheapo FPGA nowadays.
Nice to see, other people have done similar things for the Amiga [1] and Atari ST [2][3]<p>[1] <a href="http://en.wikipedia.org/wiki/Minimig" rel="nofollow">http://en.wikipedia.org/wiki/Minimig</a>
[2] <a href="http://hackaday.com/2010/01/07/suska-open-source-atari-st/" rel="nofollow">http://hackaday.com/2010/01/07/suska-open-source-atari-st/</a>
[3] <a href="http://hardware.atari.org/vhdl/vhdl.htm" rel="nofollow">http://hardware.atari.org/vhdl/vhdl.htm</a>
There's also this "Pimp my spectrum":
<a href="http://www.youtube.com/watch?v=7KegY8YIzQ4" rel="nofollow">http://www.youtube.com/watch?v=7KegY8YIzQ4</a>