chip8.h

#define dopcode memory[pc] << 8 | memory[pc + 1]
#define X       (opcode & 0x0F00) >> 8
#define Y       (opcode & 0x00F0) >> 4
#define DX      (px * SCALE)
#define DY      (py * SCALE)
#define R       (rand() % 256)
#define N       (opcode & 0x000F)
#define KK      (opcode & 0x00FF)
#define NNN     (opcode & 0x0FFF)
#define SCALE   5
#define WIDTH   64
#define HEIGHT  32
/* Don't forget commas! */
#define COLOR_ON 0, 255, 0
#define COLOR_OFF 0, 0, 0

#define INST_PER_CYCLE 5

/* Key binding; don't forget ''! */
#define KEY_1 '1'
#define KEY_2 '2'
#define KEY_3 '3'
#define KEY_C '4'

#define KEY_4 'q'
#define KEY_5 'w'
#define KEY_6 'e'
#define KEY_D 'r'

#define KEY_7 'a'
#define KEY_8 's'
#define KEY_9 'd'
#define KEY_E 'f'

#define KEY_A 'z'
#define KEY_0 'x'
#define KEY_B 'c'
#define KEY_F 'v'

#define KEY_PAUSE 'p'
#define KEY_DEBUG 'b'
#define KEY_INFO 'i'
#define KEY_HALT 'h'
#define KEY_NEXT_OPCODE 'n'


unsigned char memory[4096];
unsigned char chip8_font[80] = {
  0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
  0x20, 0x60, 0x20, 0x20, 0x70, // 1
  0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
  0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
  0x90, 0x90, 0xF0, 0x10, 0x10, // 4
  0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
  0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
  0xF0, 0x10, 0x20, 0x40, 0x40, // 7
  0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
  0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
  0xF0, 0x90, 0xF0, 0x90, 0x90, // A
  0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
  0xF0, 0x80, 0x80, 0x80, 0xF0, // C
  0xE0, 0x90, 0x90, 0x90, 0xE0, // D
  0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
  0xF0, 0x80, 0xF0, 0x80, 0x80  // F
};
char gfx[32][64];
int pc = 0x200;
unsigned int I = 0;
unsigned char V[16];
int opcode, inst, kk, x, y, px, py, i, ii, temp, cinst;
char sound, color, ccolor, running, paused, debug, next_opcode;
unsigned char sp;
int DT, ST;
int stack[16];
int keys[16];

void load_rom(FILE* fp, int start);
void beep();
int main(int argc, char* argv[]);