//	6502.h
//	Main elements of the 6502 CPU

#ifndef CPU_H
#define CPU_H

#include"stdio.h"
#include"core.h"

byte acc, X, Y, P, S = 0x00;
address PC = 0x0000;
byte* Memory;
byte* ROM;

//	FLAGS
#define flag_N 0x80 // Negative
#define flag_V 0x40	// Overflow
#define flag_B 0x10	// BRK command
#define flag_D 0x08	// Decimal mode
#define flag_I 0x04	// IRQ disable
#define flag_Z 0x02	// Zero
#define flag_C 0x01	// Carry

byte getFlag(byte flag);
// Get the value of a flag.

void setFlag(byte flag, int x);
// Set a flag with some value.

void flagSet(byte flag);
// Sets some flag.

void flagClear(byte flag);
// Clears some flag.

//	Functions which perform reusable routines for finding if a specific flag should be set.

void setFlagN(byte x);

//Perform prior to any changes
void setFlagV(byte x, byte y);

//void setFlagB();
//May not need since its dependent on the BRK insturction

//void setFlagD();
//Might not be necessary.

//void setFlagI();
//Need to work on.

void setFlagZ(int x);

//void setFlagC();
//Only 6 instructions, 2 not including stack instructions, use the carry flag.

// The following two may be better defined within apple.c

//byte getMemory(address x);
// Retrieve value from the computers address space.
// It is important not to directly access the memory array because some value hold special meaning.

//void setMemory(address x, byte y);
// Set a piece of memory to some value.

byte getStack();
// Get top value of the stack.

void setStack(byte z);
// Set top value of the stack.

#endif