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mirror of https://github.com/sehugg/8bitworkshop.git synced 2024-12-22 12:30:01 +00:00
8bitworkshop/presets/galaxian-scramble/skeleton.sdcc

185 lines
23 KiB
Plaintext

#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
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 reset_video_framecount() __critical {
video_framecount = 0;
}
void _buffer() {
__asm
; padding to get to offset 0x66
ld ix,#0
ld ix,#0
ld ix,#0
nop
nop
nop
__endasm;
}
void rst_66() __interrupt {
video_framecount++;
}
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 main() {
clrscr();
clrobjs();
enable_stars = 0xff;
enable_irq = 1;
main();
}