Most of the classic NES games you can get for download on the Internet in a format called iNES. So for now single stepping as end goal for this post will need to do.
However, being new to the whole NES arhitecture I wouldn't be able to interpret at this point the contents of screen memory to tell whether the correct startup message was written.
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I would have preferred that by the end of this post be able to boot a NES cartridge at full speed and then just look at some memory locations if the appropriate welcome was written. I will end this post by single stepping through a couple of instructions of the NES cartridge.
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The cartridge image will be targeting in this series will be PaperBoy.
I think this will be a good starting point. This strip down version will be our starting point for our JavaScript NES emulator series.īut, before we start with our stripping down exercise in this post, we be looking at the NES cartridge image format. So, in this post I will take my source from my my C64 JavaScript emulator on Github and strip it down to a minimum. Since the NES game console also had had a 6502 compatable CPU under cover, we can utilise a lot from my C64 JavaScript emulator on GitHub. This is the first part in my series on writing a NES emulator in JavaScript.
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