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#pragma once
typedef
unsigned char
byte;
typedef
unsigned short
address;
extern byte acc;
extern byte X;
extern byte Y;
extern byte P;
extern byte S;
extern address PC;
extern byte* Memory;
extern const byte ROM[];
enum Addressing
{
eImmediate,
eAccumulator,
eZeroPage,
eZeroPageIndexedX,
eZeroPageIndexedY,
eAbsolute,
eAbsoluteIndexedX,
eAbsoluteIndexedY,
eIndexedIndirect,
eIndirectIndexed,
eImplied,
eIndirectAbsolute,
eRelative
};
typedef
int
Addressing;
typedef
struct AddData
{
int cycles;
int length;
address add;
byte value;
}
AddData;
// GetMemory and SetMemory are declared here, but defined in apple.c
// This is because memory access of particular memory locations is influenced by the Apple I's specific setup, not by the CPU alone.
byte GetMemory(address x);
void SetMemory(address x, byte y);
extern void *current_instruction;
extern AddData idata;
extern void (*func)(Addressing, address);
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