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Correct read emulation of the BANK register while still in the boot ROM

This commit is contained in:
Lior Halphon 2023-07-29 16:08:26 +03:00
parent 10d996330c
commit 4ab256d896
2 changed files with 4 additions and 3 deletions
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2
Core/gb.h
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@ -192,7 +192,7 @@ enum {
/* Missing */
GB_IO_VBK = 0x4F, // CGB Mode Only - VRAM Bank
GB_IO_BANK = 0x50, // Write to disable the BIOS mapping
GB_IO_BANK = 0x50, // Write to disable the boot ROM mapping
/* CGB DMA */
GB_IO_HDMA1 = 0x51, // CGB Mode Only - New DMA Source, High

5
Core/memory.c
View File

@ -702,7 +702,8 @@ static uint8_t read_high_memory(GB_gameboy_t *gb, uint16_t addr)
return 0xFF;
}
return (gb->io_registers[GB_IO_KEY1] & 0x7F) | (gb->cgb_double_speed? 0xFE : 0x7E);
case GB_IO_BANK:
return 0xFE | gb->boot_rom_finished;
case GB_IO_RP: {
if (!gb->cgb_mode) return 0xFF;
/* You will read your own IR LED if it's on. */
@ -1572,7 +1573,7 @@ static void write_high_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
return;
case GB_IO_BANK:
gb->boot_rom_finished = true;
gb->boot_rom_finished |= value & 1;
return;
case GB_IO_KEY0: