memory.h

/* mem_c64.h - memory interface for C64 emulator */
/* by Brian Huffman 11-30-00 */

/* memory management is described on page 260 of the C64 PRG */

#ifndef MEMORY_H
#define MEMORY_H

#include <Arduino.h>

#define RAM_SIZE 1024
extern byte ram[RAM_SIZE];

#define mkWord(hi,lo) (((word)(hi) << 8) | (word)(lo))

/***************************************/
/* static inline function declarations */
/***************************************/

inline static byte mem_read_zero_page(byte address) {
  return ram[address];
}

inline static word mem_read_zero_page_16(byte address) {
  return mkWord(ram[address + 1], ram[address]);
}

inline static void mem_write_zero_page(byte address, byte value) {
  ram[address] = value;
}

inline static byte stack_read(byte address) {
  return (ram + 256)[address];
}

inline static word stack_read_16(byte address) {
  return mkWord(stack_read(address + 1), stack_read(address));
}

inline static void stack_write(byte address, byte value) {
  (ram+256)[address] = value;
}

/*****************************/
/* other function prototypes */
/*****************************/


extern void mem_reset();

// RAM:  0000 0xxx xxxx xxxx
// VIA1: 0001 1000 0000 xxxx
// VIA2: 0001 1100 0000 xxxx
// ROM:  11xx xxxx xxxx xxxx

#endif