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// DGen v1.10+
// Megadrive C++ module saving and loading
#include <stdio.h>
#include <string.h>
#include "md.h"
/*
gs0 genecyst save file INfo
GST\0 to start with
80-9f = d0-d7 almost certain
a0-bf = a0-a7 almost certain
c8 = pc fairly certain
d0 = sr fairly certain
112 Start of cram len 0x80
192 Start of vsram len 0x50
1e2-474 UNKNOWN sound info?
Start of z80 ram at 474 (they store 2000)
Start of RAM at 2478 almost certain (BYTE SWAPPED)
Start of VRAM at 12478
end of VRAM
*/
// NB - for load and save you don't need to use star_mz80_on/off
// Because stars/mz80 isn't actually used
#define fput(x,y) { if (fwrite(x,1,y,hand)!=y) goto save_error; }
#define fget(x,y) if (fread(x,1,y,hand)!=y) goto load_error;
extern int byteswap_memory(unsigned char *start,int len);
int md::import_gst(FILE *hand)
{
#ifdef COMPILE_WITH_STAR
if (cpu_emu==0)
{
fseek(hand,0x80,SEEK_SET);
fget(cpu.dreg,8*4);
fget(cpu.areg,8*4);
fseek(hand,0xc8,SEEK_SET);
fget(&cpu.pc,4);
fseek(hand,0xd0,SEEK_SET);
fget(&cpu.sr,4);
}
#endif
#ifdef COMPILE_WITH_MUSA
if (cpu_emu==1)
{
int i,t;
fseek(hand,0x80,SEEK_SET);
for (i=0;i<8;i++)
{ fget(&t,4); m68k_poke_dr(i,t); }
for (i=0;i<8;i++)
{ fget(&t,4); m68k_poke_ar(i,t); }
fseek(hand,0xc8,SEEK_SET);
fget(&t,4); m68k_poke_pc(t);
fseek(hand,0xd0,SEEK_SET);
fget(&t,4); m68k_poke_sr(t);
}
#endif
fseek(hand,0xfa,SEEK_SET);
fget(vdp.reg,0x18);
fseek(hand,0x112,SEEK_SET);
fget(vdp.cram ,0x00080);
byteswap_memory(vdp.cram,0x80);
fget(vdp.vsram,0x00050);
byteswap_memory(vdp.vsram,0x50);
fseek(hand,0x474,SEEK_SET);
fget(z80ram, 0x02000);
fseek(hand,0x2478,SEEK_SET);
fget(ram, 0x10000);
byteswap_memory(ram,0x10000);
fget(vdp.vram ,0x10000);
memset(vdp.dirt,0xff,0x35); // mark everything as changed
return 0;
load_error:
return 1;
}
int md::export_gst(FILE *hand)
{
int i;
static unsigned char gst_head[0x80]=
{
0x47,0x53,0x54,0,0,0,0xe0,0x40
// 00 00 00 00 00 00 00 00 00 00 00 00 00 21 80 fa <.............!..>
};
unsigned char *zeros=gst_head+0x40; // 0x40 zeros
fseek(hand,0x00,SEEK_SET);
// Make file size 0x22478 with zeros
for (i=0;i<0x22440;i+=0x40) fput(zeros,0x40);
fput(zeros,0x38);
fseek(hand,0x00,SEEK_SET);
fput(gst_head,0x80);
#ifdef COMPILE_WITH_STAR
if (cpu_emu==0)
{
fseek(hand,0x80,SEEK_SET);
fput(cpu.dreg,8*4);
fput(cpu.areg,8*4);
fseek(hand,0xc8,SEEK_SET);
fput(&cpu.pc,4);
fseek(hand,0xd0,SEEK_SET);
fput(&cpu.sr,4);
}
#endif
#ifdef COMPILE_WITH_MUSA
if (cpu_emu==1)
{
int i,t;
fseek(hand,0x80,SEEK_SET);
for (i=0;i<8;i++)
{ t=m68k_peek_dr(i); fput(&t,4);}
for (i=0;i<8;i++)
{ t=m68k_peek_ar(i); fput(&t,4);}
fseek(hand,0xc8,SEEK_SET);
t=m68k_peek_pc(); fput(&t,4);
fseek(hand,0xd0,SEEK_SET);
t=m68k_peek_sr(); fput(&t,4);
}
#endif
fseek(hand,0xfa,SEEK_SET);
fput(vdp.reg,0x18);
fseek(hand,0x112,SEEK_SET);
byteswap_memory(vdp.cram,0x80);
fput(vdp.cram ,0x00080);
byteswap_memory(vdp.cram,0x80);
byteswap_memory(vdp.vsram,0x50);
fput(vdp.vsram,0x00050);
byteswap_memory(vdp.vsram,0x50);
fseek(hand,0x474,SEEK_SET);
fput(z80ram, 0x02000);
fseek(hand,0x2478,SEEK_SET);
byteswap_memory(ram,0x10000);
fput(ram, 0x10000);
byteswap_memory(ram,0x10000);
fput(vdp.vram ,0x10000);
return 0;
save_error:
return 1;
}
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