GOBOY2

Introduction

As the name implies, this is my second try to develop a gameboy emulator in go. The first one was capable of playing Tetris and even some other games, but I wanted to improve the accuracy of emulation. To do so I've decided to rewrite the CPU to use some kind of micro-opcodes which really helped a lot.

Boot-Roms

Due to the fact, that the data of the rom chips of the original gameboy is IP of Nintendo. This data is stripped from the code. It could be added by adding the binary data to mmu/bootom.go. The other option is to start the emulator using the -noboot option.

Deployment

You might need to install the SDL2 libs for your system.

Input

The default key-map is as follows:

	Up, Down, 
	Left, Right --> Arrow Keys

	Start       --> Return 
	Select      --> Backspace
	
	A           --> X-Key
	B           --> Y-Key

Tests

Blargg

Test	Result
cgb_sound	❌
cpu_instrs	✅
dmg_sound	❌
instr_timing	✅
interrupt_time	✅
mem_timing	✅
mem_timing-2	✅
oam_bug	❌
halt_bug	✅

Mooneye

With the tests from the 18. Apr. 2020 the emulator currently gets the following results:

General

Test	Result
acceptance -> add_sp_e_timing	✅
acceptance -> bits -> mem_oam	✅
acceptance -> bits -> reg_f	✅
acceptance -> call_cc_timing	✅
acceptance -> call_cc_timing2	✅
acceptance -> call_timing	✅
acceptance -> call_timing2	✅
acceptance -> div_timing	✅
acceptance -> ei_sequence	✅
acceptance -> ei_timing	✅
acceptance -> halt_ime0_ei	✅
acceptance -> halt_ime0_nointr_timing	❌
acceptance -> halt_ime1_timing	✅
acceptance -> if_ie_registers	✅
acceptance -> instr -> daa	✅
acceptance -> interrupts -> ie_push	✅
acceptance -> intr_timing	✅
acceptance -> jp_cc_timing	✅
acceptance -> jp_timing	✅
acceptance -> ld_hl_sp_e_timing	✅
acceptance -> oam_dma -> basic	✅
acceptance -> oam_dma -> reg_read	✅
acceptance -> oam_dma_restart	✅
acceptance -> oam_dma_start	✅
acceptance -> oam_dma_timing	✅
acceptance -> pop_timing	✅
acceptance -> ppu -> intr_2_0_timing	❌
acceptance -> ppu -> intr_2_mode0_timing	❌
acceptance -> ppu -> intr_2_mode0_timing_sprites	❌
acceptance -> ppu -> intr_2_mode3_timing	❌
acceptance -> ppu -> intr_2_oam_ok_timing	❌
acceptance -> ppu -> stat_irq_blocking	❌
acceptance -> ppu -> stat_lyc_onoff	❌
acceptance -> push_timing	✅
acceptance -> rapid_di_ei	✅
acceptance -> ret_cc_timing	✅
acceptance -> ret_timing	✅
acceptance -> reti_intr_timing	✅
acceptance -> reti_timing	✅
acceptance -> rst_timing	✅
acceptance -> timer -> div_write	✅
acceptance -> timer -> rapid_toggle	✅
acceptance -> timer -> tim00	✅
acceptance -> timer -> tim00_div_trigger	✅
acceptance -> timer -> tim01	✅
acceptance -> timer -> tim01_div_trigger	✅
acceptance -> timer -> tim10	✅
acceptance -> timer -> tim10_div_trigger	✅
acceptance -> timer -> tim11	✅
acceptance -> timer -> tim11_div_trigger	✅
acceptance -> timer -> tima_reload	✅
acceptance -> timer -> tima_write_reloading	✅
acceptance -> timer -> tma_write_reloading	✅
emulator-only -> mbc1 -> bits_bank1	✅
emulator-only -> mbc1 -> bits_bank2	✅
emulator-only -> mbc1 -> bits_mode	✅
emulator-only -> mbc1 -> bits_ramg	✅
emulator-only -> mbc1 -> multicart_rom_8Mb	✅
emulator-only -> mbc1 -> ram_256kb	✅
emulator-only -> mbc1 -> ram_64kb	✅
emulator-only -> mbc1 -> rom_16Mb	✅
emulator-only -> mbc1 -> rom_1Mb	✅
emulator-only -> mbc1 -> rom_2Mb	✅
emulator-only -> mbc1 -> rom_4Mb	✅
emulator-only -> mbc1 -> rom_512kb	✅
emulator-only -> mbc1 -> rom_8Mb	✅
emulator-only -> mbc2 -> bits_ramg	✅
emulator-only -> mbc2 -> bits_romb	✅
emulator-only -> mbc2 -> bits_unused	✅
emulator-only -> mbc2 -> ram	✅
emulator-only -> mbc2 -> rom_1Mb	✅
emulator-only -> mbc2 -> rom_2Mb	✅
emulator-only -> mbc2 -> rom_512kb	✅
emulator-only -> mbc5 -> rom_16Mb	✅
emulator-only -> mbc5 -> rom_1Mb	✅
emulator-only -> mbc5 -> rom_2Mb	✅
emulator-only -> mbc5 -> rom_32Mb	✅
emulator-only -> mbc5 -> rom_4Mb	✅
emulator-only -> mbc5 -> rom_512kb	✅
emulator-only -> mbc5 -> rom_64Mb	✅
emulator-only -> mbc5 -> rom_8Mb	✅

DMG

Test	Result
acceptance -> bits -> unused_hwio-GS	✅
acceptance -> boot_div-dmgABCmgb	✅
acceptance -> boot_hwio-dmgABCmgb	✅
acceptance -> boot_regs-dmgABC	✅
acceptance -> di_timing-GS	❌
acceptance -> halt_ime1_timing2-GS	❌
acceptance -> oam_dma -> sources-GS	✅
acceptance -> ppu -> hblank_ly_scx_timing-GS	❌
acceptance -> ppu -> intr_1_2_timing-GS	❌
acceptance -> ppu -> lcdon_timing-GS	❌
acceptance -> ppu -> lcdon_write_timing-GS	❌
acceptance -> ppu -> vblank_stat_intr-GS	❌
acceptance -> serial -> boot_sclk_align-dmgABCmgb	❌

GBC

Test	Result
misc -> bits -> unused_hwio-C	✅
misc -> boot_div-cgbABCDE	✅
misc -> boot_hwio-C	✅
misc -> boot_regs-cgb	✅
misc -> ppu -> vblank_stat_intr-C	❌