Easy 6502
I came across this when I was searching for resources to help better understand ALUs and assembler.I love it because:1. My first computer (an Acorn Electron) had a 6502 processor, and gave me my first exposure to assembler.2. It's been built so you can do all the exercises in the browser. I really like stuff like this (e.g. Scrimba), as it makes it so much more likely that you'll get started.A related point: as I go through it, I'm thinking about which instructions are really necessary (maybe all of them?) and why it would be inconvenient if you didn't have a particular instruction.