6502 processor Instructions

In the course SPO600,  6502 processor is introduced. I have learned about X register, Y register, Accumulator and some instructions. To my surprise, instructions supported by each register are difference. For example, Y register can work with STA ($00), Y. However, this instruction does not work with X register. The reason 6502 processor was designed with certain limitations could probably to balance cost and complexity. Another surprise to me is that we can directly do an incrementation to the data in the memory with instruction INC. I started working on the Lab 1 and will have the result posted soon.

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