Special high-speed memory area used like extra registers. Stack ($0100–$01FF): Fixed location for the system stack.
To start, you must define the data structures representing the CPU's internal state. Description (Program Counter) Points to the next instruction in memory. A (Accumulator) Used for all arithmetic and logic. X & Y (Index) Used for addressing offsets and loops. S (Stack Pointer) 6502-emulator
The 6502 uses a 16-bit address bus, allowing it to address 64 KB of memory. Special high-speed memory area used like extra registers