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Games have "sets" (AKA versions). The software changes but not the hardware. For instance Pengo set 2 is harder than set 1 and has a different music (to avoid lawsuits?)
If you can "mod" an existing game, then ignore the checksums, you could run your own game. You would have messages like:
g8x_p6.bin WRONG CHECKSUMS:
EXPECTED: CRC(7e3471d3) SHA1(...
6
There are several revisions of the C-64 board (see, e.g., here , or here), with two major form factors: the old "long board" and the new "short board". The long board (which I happen to have on my bench right now) is approximately 39cm wide and 18cm long, the short board is just as wide, but a little, well, shorter.
If you need exact dimensions and drill ...
6
The IPL binary they're referring to is what's more commonly called the ROM "boot code", and it exists in every Nintendo 64 cartridge. Despite containing ordinary mask ROMs, in practice N64 cartridges work more like disk drives. The CPU doesn't execute code in the cartridge ROMs directly, instead the N64 firmware loads the first 4096 bytes of the ROM into ...
1
There are a lot of easy and simple constructions, based on the Z80 CPU. I prefer the simple Grant Searle's Computer. If you prefer the more simple way, you could try the ready-made solution, like the RC2014 Homebrew Computer.
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