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Randomize initial RAM values. Closes #82

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This commit is contained in:
Lior Halphon 2018-06-30 16:53:28 +03:00
parent d9dfbcd199
commit 47a74cb6c3
1 changed files with 38 additions and 6 deletions
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44
Core/gb.c
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@ -443,11 +443,45 @@ void GB_set_user_data(GB_gameboy_t *gb, void *data)
gb->user_data = data;
}
static void reset_ram(GB_gameboy_t *gb)
{
switch (gb->model) {
case GB_MODEL_CGB_E:
default:
for (unsigned i = 0; i < gb->ram_size; i++) {
gb->ram[i] = (random() & 0xFF);
}
break;
case GB_MODEL_DMG_B:
for (unsigned i = 0; i < gb->ram_size; i++) {
gb->ram[i] = (random() & 0xFF);
if (i & 0x100) {
gb->ram[i] &= random();
}
else {
gb->ram[i] |= random();
}
}
break;
#if 0
/* Not emulated yet, for documentation only*/
case GB_MODEL_SGB2:
for (unsigned i = 0; i < gb->ram_size; i++) {
gb->ram[i] = 0x55;
gb->ram[i] ^= random() & random() & random();
}
break;
#endif
}
}
void GB_reset(GB_gameboy_t *gb)
{
uint32_t mbc_ram_size = gb->mbc_ram_size;
bool cgb = GB_is_cgb(gb);
GB_model_t model = gb->model;
memset(gb, 0, (size_t)GB_GET_SECTION((GB_gameboy_t *) 0, unsaved));
gb->model = model;
gb->version = GB_STRUCT_VERSION;
gb->mbc_rom_bank = 1;
@ -455,18 +489,14 @@ void GB_reset(GB_gameboy_t *gb)
gb->cgb_ram_bank = 1;
gb->io_registers[GB_IO_JOYP] = 0xF;
gb->mbc_ram_size = mbc_ram_size;
if (cgb) {
if (GB_is_cgb(gb)) {
gb->ram_size = 0x2000 * 8;
memset(gb->ram, 0, gb->ram_size);
gb->vram_size = 0x2000 * 2;
memset(gb->vram, 0, gb->vram_size);
gb->model = GB_MODEL_CGB_E;
gb->cgb_mode = true;
}
else {
gb->ram_size = 0x2000;
memset(gb->ram, 0, gb->ram_size);
gb->vram_size = 0x2000;
memset(gb->vram, 0, gb->vram_size);
@ -481,6 +511,8 @@ void GB_reset(GB_gameboy_t *gb)
gb->rgb_encode_callback(gb, 0, 0, 0);
}
}
reset_ram(gb);
/* The serial interrupt always occur on the 0xF7th cycle of every 0x100 cycle since boot. */
gb->serial_cycles = 0x100-0xF7;
gb->io_registers[GB_IO_SC] = 0x7E;