#include <string.h>

typedef unsigned char byte;
typedef unsigned short word;
typedef signed char sbyte;

byte __at (0x4800) vram[32][32];

struct {
  byte scroll;
  byte attrib;
} __at (0x5000) columns[32];

struct {
  byte xpos;
  byte code;
  byte color;
  byte ypos;
} __at (0x5040) sprites[8];

struct {
  signed char dx; // unused by h/w
  byte xpos;
  signed char dy; // unused by h/w
  byte ypos;
} __at (0x5060) missiles[8];

byte __at (0x5080) xram[128];

byte __at (0x6801) enable_irq;
byte __at (0x6804) enable_stars;
byte __at (0x6808) missile_width;
byte __at (0x6809) missile_offset;
byte __at (0x7000) watchdog;
byte __at (0x8100) input0;
byte __at (0x8101) input1;
byte __at (0x8102) input2;

#define LEFT1 !(input0 & 0x20)
#define RIGHT1 !(input0 & 0x10)
#define UP1 !(input0 & 0x1)
#define DOWN1 !(input2 & 0x40)
#define FIRE1 !(input0 & 0x8)
#define BOMB1 !(input0 & 0x2)
#define COIN1 !(input0 & 0x80)
#define COIN2 !(input0 & 0x40)
#define START1 !(input1 & 0x80)
#define START2 !(input1 & 0x40)

__sfr __at (0x1) ay8910_a_reg;
__sfr __at (0x2) ay8910_a_data;
__sfr __at (0x4) ay8910_b_reg;
__sfr __at (0x8) ay8910_b_data;

inline void set8910a(byte reg, byte data) {
  ay8910_a_reg = reg;
  ay8910_a_data = data;
}
inline void set8910b(byte reg, byte data) {
  ay8910_b_reg = reg;
  ay8910_b_data = data;
}

typedef enum {
  AY_PITCH_A_LO, AY_PITCH_A_HI,
  AY_PITCH_B_LO, AY_PITCH_B_HI,
  AY_PITCH_C_LO, AY_PITCH_C_HI,
  AY_NOISE_PERIOD,
  AY_ENABLE,
  AY_ENV_VOL_A,
  AY_ENV_VOL_B,
  AY_ENV_VOL_C,
  AY_ENV_PERI_LO, AY_ENV_PERI_HI,
  AY_ENV_SHAPE
} AY8910Register;

///

void main();

void start() {
__asm
	LD      SP,#0x4800
        EI
; copy initialized data to RAM
        LD    BC, #l__INITIALIZER+1
        LD    A, B
        LD    DE, #s__INITIALIZED
        LD    HL, #s__INITIALIZER
        LDIR
__endasm;
	main();
}

const char __at (0x4000) tilerom[0x1000] = {
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};
const char __at (0x5000) palette[32] = {
  0x00,0x00,0x00,0xf6,0x00,0x16,0xc0,0x3f,
  0x00,0xd8,0x07,0x3f,0x00,0xc0,0xc4,0x07,
  0x00,0xc0,0xa0,0x07,0x00,0x00,0x00,0x07,
  0x00,0xf6,0x07,0xf0,0x00,0x76,0x07,0xc6,
};

#define LOCHAR 0x30
#define HICHAR 0xff

#define CHAR(ch) (ch-LOCHAR)

#define BLANK 0x10

void clrscr() {
  memset(vram, BLANK, sizeof(vram));
}

byte getchar(byte x, byte y) {
  return vram[29-x][y];
}

volatile byte video_framecount; // actual framecount

void _buffer() {
__asm
; padding to get to offset 0x66
  ld ix,#0
  ld ix,#0
  ld ix,#0
  nop
  nop
  nop
  nop
__endasm;
}

void rst_66() __interrupt {
  video_framecount++;
}

void reset_video_framecount() __critical {
  video_framecount = 0;
}


void putchar(byte x, byte y, byte ch) {
  vram[29-x][y] = ch;
}

void clrobjs() {
  byte i;
  memset(columns, 0, 0x100);
  for (i=0; i<8; i++)
    sprites[i].ypos = 64;
}

void putstring(byte x, byte y, const char* string) {
  while (*string) {
    putchar(x++, y, CHAR(*string++));
  }
}

void wait_for_frame() {
  byte initial_framecount = video_framecount;
  watchdog++;
  while (video_framecount == initial_framecount);
}

///

void main() {
  clrscr();
  clrobjs();
  enable_stars = 0xff;
  enable_irq = 1;
  while (1) {
    wait_for_frame();
  }
}