[PDF] 6502 stack address

One of the 6502 registers is called the Stack Pointer (SP). This register is only 8 bits. The reason it's only 8 bits is because the stack always resides at $0100 to $01FF. Therefore, we only need to store the least significant byte of the address that our stack points to.
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  • Where is the stack in 6502?

    The 6502 has hardware support for a stack implemented using a 256-byte array whose location is hardcoded at page $01 ($0100-$01FF), using the S register for a stack pointer.4 août 2020

  • What is the address space of 6502?

    The 6502 has a 16-bit address space ( 0000 to ffff in hex), allowing it to natively address 64KB of memory. Ben's design has 16KB of RAM, 32KB of programmable ROM, and uses the remaining address space for the 65C22 Versatile Interface Adapter (VIA), which is used for input and output devices.

  • What is the stack in 6502?

    Unlike its main rival the Z80, the 6502 had a size limit of 256 bytes for the hardware stack. The 6502 stack is mainly meant as a return return stack and for register preservation - which usually isn't a lot on a CPU with just 3 registers.2 jan. 2023
  • A stack frame is identified by a memory address in a register called the base-pointer, EBP (this is specific to IA-32 architecture, but other CPU's might have a similar register). The EBP contains the base of the current stack frame, that is, the highest numbered address in the stack frame.
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