The instruction set
Similar instructions to those discussed earlier are implemented within most general-purpose processor architectures, though more sophisticated processors augment their capabilities with additional categories of instructions. The more advanced instructions available in modern processor architectures will be introduced in later chapters.
CISC processors generally support multiple addressing modes. Addressing modes are designed to enable efficient access to sequential memory locations for use by software algorithms running on the processor. The next section describes the instruction addressing modes implemented by the 6502 processor. The section following that will introduce the categories of instructions implemented by the 6502, most of which are represented in modern processor architectures. Specialized instructions for processing interrupts and for input/output operations will then be covered, including an explanation of processor features that enable high...
