195 lines
23 KiB
Plaintext
195 lines
23 KiB
Plaintext
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#include <string.h>
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typedef unsigned char byte;
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typedef unsigned short word;
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typedef signed char sbyte;
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byte __at (0x4800) vram[32][32];
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struct {
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byte scroll;
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byte attrib;
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} __at (0x5000) columns[32];
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struct {
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byte xpos;
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byte code;
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byte color;
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byte ypos;
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} __at (0x5040) sprites[8];
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struct {
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signed char dx; // unused by h/w
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byte xpos;
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signed char dy; // unused by h/w
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byte ypos;
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} __at (0x5060) missiles[8];
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byte __at (0x5080) xram[128];
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byte __at (0x6801) enable_irq;
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byte __at (0x6804) enable_stars;
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byte __at (0x6808) missile_width;
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byte __at (0x6809) missile_offset;
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byte __at (0x7000) watchdog;
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byte __at (0x8100) input0;
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byte __at (0x8101) input1;
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byte __at (0x8102) input2;
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#define LEFT1 !(input0 & 0x20)
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#define RIGHT1 !(input0 & 0x10)
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#define UP1 !(input0 & 0x1)
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#define DOWN1 !(input2 & 0x40)
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#define FIRE1 !(input0 & 0x8)
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#define BOMB1 !(input0 & 0x2)
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#define COIN1 !(input0 & 0x80)
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#define COIN2 !(input0 & 0x40)
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#define START1 !(input1 & 0x80)
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#define START2 !(input1 & 0x40)
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__sfr __at (0x1) ay8910_a_reg;
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__sfr __at (0x2) ay8910_a_data;
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__sfr __at (0x4) ay8910_b_reg;
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__sfr __at (0x8) ay8910_b_data;
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inline void set8910a(byte reg, byte data) {
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ay8910_a_reg = reg;
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ay8910_a_data = data;
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}
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inline void set8910b(byte reg, byte data) {
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ay8910_b_reg = reg;
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ay8910_b_data = data;
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}
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typedef enum {
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AY_PITCH_A_LO, AY_PITCH_A_HI,
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AY_PITCH_B_LO, AY_PITCH_B_HI,
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AY_PITCH_C_LO, AY_PITCH_C_HI,
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AY_NOISE_PERIOD,
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AY_ENABLE,
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AY_ENV_VOL_A,
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AY_ENV_VOL_B,
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AY_ENV_VOL_C,
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AY_ENV_PERI_LO, AY_ENV_PERI_HI,
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AY_ENV_SHAPE
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} AY8910Register;
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///
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void main();
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void start() {
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__asm
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LD SP,#0x4800
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EI
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; copy initialized data to RAM
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LD BC, #l__INITIALIZER+1
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LD A, B
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LD DE, #s__INITIALIZED
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LD HL, #s__INITIALIZER
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LDIR
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__endasm;
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main();
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}
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const char __at (0x4000) tilerom[0x1000] = {
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x78,0x00,0x02,0x06,0x10,0x01,0x4a,0x00,0x10,0x00,0xa0,0x02,0x14,0x10,0x08,0x00,0x00,0x80,0x01,0x1c,0x40,0x86,0x01,0x81,0x60,0x00,0x04,0x90,0x70,0x08,0x02,0x00,0x40,0x00,0x00,0x40,0x00,0x20,0x00,0x10,0x7c,0x81,0x01,0x01,0x04,0x00,0x08,0x80,0x20,0x04,0x01,0x40,0x04,0x48,0x11,0xa0,0x00,0x02,0x00,0x08,0x84,0x02,0x01,0x00,0x18,0x86,0x80,0x0c,0x11,0x18,0xdb,0x05,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x0c,0x00,0x02,0x00,0x00,0x00,0x00,0x62,0x90,0x01,0x05,0x00,0x01,0x81,0x7c,0x01,0x40,0x00,0xc0,0x00,0x01,0x80,0x80,0x40,0x44,0x80,0x01,0x02,0x64,0x00,0x00,0x48,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x04,0x03,0x00,0x00,0x18,0x00,0x12,0x10,0x0a,0xc2,0x00,0x01,0x00,0x00,0x01,0x00,0x02,0x00,0x21,0x02,0x19,0x8e,0xa2,0x6c,0xe4,0x70,0x00,0x00,0x00,0x00,0x00,0x60,0xe3,0x02,0x60,0x00,0x14,0x20,0x08,0x80,0x00,0x00,0x0e,0x5a,0x5b,0x8a,0x45,0x35,0x04,0x02,0xe0,0x00,0x10,0x90,0x40,0x20,0x00,0x80,0x12,0x15,0x04,0x00,0x00,0x00,0x02,0x02,0xc0,0x60,0x20,0x60,0x20,0x18,0x3c,0x00,0x01,0x0e,0x0a,0x10,0x18,0x10,0x00,0x30,0x05,0x20,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x09,0x08,0x08,0x40,0x40,0x0c,0x10,0x20,0x20,0xd0,0x00,0x08,0x70,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x24,0x12,0x0a,0x00,0x10,
|
|
0x00,0x00,0x60,0x30,0x18,0x08,0x00,0x00,0x10,0x40,0x20,0x40,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x20,0x20,0x00,0x00,0x00,0x40,0x10,0x08,0x0d,0x10,0x00,0x00,0x00,0x00,0x06,0x10,0x00,0x00,0x00,0x05,0x08,0x02,0x44,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0xa0,0x10,0x88,0x04,0x00,0x00,0x00,0x00,0x00,0x06,0x04,0x00,0x00,0x00,0x08,0x08,0x04,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x00,0x00,0x00,0x08,0x12,0x24,0x08,0x50,0x00,0x40,0x00,0x00,0x70,0x04,0x00,0x01,0x0e,0x80,0xa8,0x00,0x80,0x20,0x40,0x60,0x00,0x80,0x08,0x00,0x08,0x00,0x00,0x00,0x00,0x08,0x00,0x00,0x02,0x00,0x00,0x88,0x00,0x40,0x00,0x39,0x04,0x02,0x00,0x00,0x00,0x00,0x00,0x40,0x60,0x38,0x01,0x08,0x04,0x02,0x00,0x30,0x30,0x18,0x04,0x00,0x01,0x00,0x0a,0x0c,0x04,0x02,0x02,0x04,0x70,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0xe0,0xe5,0x03,0x00,0x00,0x00,0x00,0x0c,0x18,0x40,0x80,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x3a,0x00,0x08,0x98,0x70,0x00,0x20,0x0e,0x0e,0x01,0x00,0x00,0x02,0x80,0x90,0x23,0x31,0xbd,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x02,0x80,0x87,0x08,0x10,0x20,0x00,0x00,0x00,0x04,0x01,0x00,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x02,0x80,0x00,0x00,0x00,0x40,0x00,0x40,0x10,0x64,0x84,0x00,0x00,0x00,0x00,0x00,0x10,0xc8,0xc1,0xc0,0x38,0x20,0x80,0x50,0x10,0x08,0x00,0x00,0x80,
|
|
};
|
|
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();
|
|
}
|
|
}
|