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https://github.com/ekeeke/Genesis-Plus-GX.git
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BIOS support (continued)
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892abc8589
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b051d03f86
@ -303,6 +303,8 @@ static void getrominfo(char *romheader)
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}
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else
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{
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int i,j;
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/* Some SMS games don't have any header */
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if (system_hw != SYSTEM_MD) return;
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@ -312,7 +314,7 @@ static void getrominfo(char *romheader)
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/* Domestic (japanese) name */
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rominfo.domestic[0] = romheader[ROMDOMESTIC];
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int i, j = 1;
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j = 1;
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for (i=1; i<48; i++)
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{
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if ((rominfo.domestic[j-1] != 32) || (romheader[ROMDOMESTIC + i] != 32))
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@ -371,8 +373,8 @@ static void deinterleave_block(uint8 * src)
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memcpy (block, src, 0x4000);
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for (i = 0; i < 0x2000; i += 1)
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{
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src[i * 2 + 0] = block[0x2000 + (i)];
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src[i * 2 + 1] = block[0x0000 + (i)];
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src[i * 2 + 0] = block[0x2000 + (i)];
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src[i * 2 + 1] = block[0x0000 + (i)];
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}
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}
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@ -393,17 +395,17 @@ int load_rom(char *filename)
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if (!size) return(0);
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/* Auto-detect system mode from ROM file extension */
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if (!strnicmp(".sms", &filename[strlen(filename) - 4], 4))
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if (!strncmp(".sms", &filename[strlen(filename) - 4], 4))
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{
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/* Master System II hardware */
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system_hw = SYSTEM_SMS2;
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}
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else if (!strnicmp(".gg", &filename[strlen(filename) - 3], 3))
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else if (!strncmp(".gg", &filename[strlen(filename) - 3], 3))
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{
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/* Game Gear hardware (GG mode) */
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system_hw = SYSTEM_GG;
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}
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else if (!strnicmp(".sg", &filename[strlen(filename) - 3], 3))
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else if (!strncmp(".sg", &filename[strlen(filename) - 3], 3))
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{
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/* SG-1000 hardware */
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system_hw = SYSTEM_SG;
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@ -414,7 +416,7 @@ int load_rom(char *filename)
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system_hw = SYSTEM_MD;
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/* Decode .MDX format */
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if (!strnicmp(".mdx", &filename[strlen(filename) - 4], 4))
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if (!strncmp(".mdx", &filename[strlen(filename) - 4], 4))
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{
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for (i = 4; i < size - 1; i++)
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{
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@ -444,9 +446,6 @@ int load_rom(char *filename)
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if (size > MAXROMSIZE) size = MAXROMSIZE;
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cart.romsize = size;
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/* clear unused ROM space */
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memset(cart.rom + size, 0xff, MAXROMSIZE - size);
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/* get infos from ROM header */
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getrominfo((char *)cart.rom);
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@ -456,9 +455,6 @@ int load_rom(char *filename)
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system_hw = SYSTEM_PICO;
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}
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/* detect console region */
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region_autodetect();
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/* Save ROM type for later use */
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romtype = system_hw;
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@ -484,13 +480,16 @@ int load_rom(char *filename)
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system_hw = config.system;
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}
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/* set console region */
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region_autodetect();
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/* Genesis mode specific */
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if (system_hw == SYSTEM_MD)
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{
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#ifdef LSB_FIRST
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/* Byteswap ROM to optimize 16-bit access */
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uint8 temp;
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for(i = 0; i < size; i += 2)
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for (i = 0; i < size; i += 2)
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{
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temp = cart.rom[i];
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cart.rom[i] = cart.rom[i+1];
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@ -512,6 +511,13 @@ int load_rom(char *filename)
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}
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}
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/* Master System or Game Gear BIOS ROM are loaded within $400000-$4FFFFF area */
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if (size > 0x400000)
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{
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/* Mark both BIOS as unloaded if loaded ROM is overwriting them */
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config.bios &= ~(SYSTEM_SMS | SYSTEM_GG);
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}
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return(1);
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}
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@ -531,19 +537,23 @@ void region_autodetect(void)
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{
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/* country codes used to differentiate region */
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/* 0001 = japan ntsc (1) */
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/* 0010 = japan pal (2) */
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/* 0010 = japan pal (2) -> does not exist ? */
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/* 0100 = usa (4) */
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/* 1000 = europe (8) */
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int country = 0;
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int i = 0;
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char c;
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/* from Gens */
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if (!strnicmp(rominfo.country, "eur", 3)) country |= 8;
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else if (!strnicmp(rominfo.country, "usa", 3)) country |= 4;
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else if (!strnicmp(rominfo.country, "jap", 3)) country |= 1;
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if (!strncmp(rominfo.country, "eur", 3)) country |= 8;
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else if (!strncmp(rominfo.country, "EUR", 3)) country |= 8;
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else if (!strncmp(rominfo.country, "jap", 3)) country |= 1;
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else if (!strncmp(rominfo.country, "JAP", 3)) country |= 1;
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else if (!strncmp(rominfo.country, "usa", 3)) country |= 4;
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else if (!strncmp(rominfo.country, "USA", 3)) country |= 4;
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else
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{
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int i;
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char c;
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/* look for each characters */
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for(i = 0; i < 4; i++)
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{
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@ -590,7 +600,7 @@ void region_autodetect(void)
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else if (config.region_detect == 4) region_code = REGION_JAPAN_PAL;
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/* PAL/NTSC timings */
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vdp_pal = (region_code & REGION_JAPAN_PAL) >> 6;
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vdp_pal = (region_code >> 6) & 0x01;
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}
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