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Not a year should pass without someone doing something with the MOS 6502. And even though 2023 brought a whole armada of 6502-based projects, the following find particularly captivated us.

Nearly everyone who has tinkered with a variant of the MOS6502 is familiar with Skilldrick's easy6502. Nick Morgan's introduction to assembly programming is not only legendary, but it is also simply excellent. Therefore, it's not surprising that there are offshoots of the project attempting to improve on the shortcomings of the original.

Torkild Ulvøy Resheim, known as @torkildr, has done exactly this, releasing the remarkable 6502js.

Unlike Nick's version, this simulator comes with complete documentation of all the official mnemonics of the 6502 assembly dialect, including the various addressing modes.

Since there is no direct introduction to assembly programming, this small but fine tool is more suited for those who already know what they are doing or for those who want to take the next steps.

And if you have the time and interest, just load one of the 18 examples and dig through the sources instruction by instruction.

A great project.