I stumbled across this video presentation about reverse engineering the MOS 6502, and of course I had to watch it. Quite an interesting watch!
I always wondered about the LAX/SAX instructions, and why there aren't similar illegal opcodes for other register combinations. Turns out that the opcode's lower bits define which register is to be worked with, %00 for Y, %10 for A, and %01 for X. %11 is not intended to be used, but when it is used, it causes both A and X to be affected, expla
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