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A DMG Game Boy emulator for Windows written in C++, using SDL2 for the graphics, input and audio.

(Despite its name, it in no way attempts to be better than other emulators out there, it's just a name I came up with.)

Source code and building

Impossible Game Boy DMG LCD Screen Swap - Desoldering the LCD from the PCB. This could make backlight mods easier to do and would allow salvaging the DMG screen for spare parts if doing a Game. Additionally, DMG Deals Damage will work on any Game Boy model, be it original, Color, Advance, or clone. In this case, “DMG” is short for “Dot Matrix Game,” which was the code name for. View and Download Nintendo DMG-01 - Game Boy Console manual online. DMG-01 - Game Boy Console Game Console pdf manual download. Also for: Game boy.

gbpp.cpp contains the main application logic and loop, components/gbcpu.cpp the CPU (Central Processing Unit) and timer emulation, components/gbapu.cpp the APU (Audio Processing Unit) and sound emulation, components/gbppu.cpp the PPU (Picture Processing Unit) emulation and components/gbmem.cpp the RAM (Random-Access Memory), ROM (Read-Only Memory) and MBC1 (Memory Bank Controller 1) emulation.

Requires SDL2 to be installed and SDL2.dll to be in the same directory as gbpp.cpp. It can then be compiled for Windows using MinGW with

gbpp can (and actually should) be run from the command line, and it accepts flags. Running it with no flags, -h or --help will print the list of accepted arguments. The message is the following:

Note that starting without a path to the game ROM will exit immediately with the message

Accuracy

Emulation speed is more or less accurate but some instructions are still incorrectly/not implemented and audio is a bit here-and-there.

It passes some of blargg's instruction test ROMs but the cpu_instrs test hangs on test 03. It can run Tetris, Super Mario Land, Is that a demo in your pocket? and some other games or demos (mostly) fine, apart from a few visual artifacts and inaccuraties.

The emulated CPU runs most of the time at around 4MiHz on an Intel Core i7-8550U at 1.80GHz.

User interface

gbpp's UI consists of two windows, one for the emulated Game Boy's screen and one for debug (which starts hidden but can be shown with D). The main window's size is 480x432 pixels, which is three times the resolution of the Game Boy's screen.

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In the debug window, gbpp renders the whole background (32x32 8x8 tiles, palette mapped) and the tilemap from addresses 8000h to 9800h. It also shows the current value for each register, the last interrupt that was serviced, the current selected ROM bank, the scanline location and a disassembly from addresses PC - 30 to PC + 30.

When exiting the emulator (either by pressing escape or by closing the window) the emulator will dump the five last instructions, the state of the registers as well as the top 10 bytes on the stack.

Screenshots

Images from Tetris and Super Mario Land.

This is the debugger view:

Whether you are an avid Mac programmer using a Windows PC, or you just found a DMG file on your Windows machine, it can be useful to know what it is and how to open it. Luckily it’s easy to open on Windows if you know how. How to run dmg file in windows 7.

Controls

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The controls are mapped to the following keys:

In addition to those, there are some other keys that do useful things:

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Right now these keys are hardcoded and cannot be configured (except by manually editing the source code).

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Audio

While the emulator does output sound, it could be more accurate. There are occasional pops and clicks and it does not support noise frequency control or pulse 1's frequency sweep. However, Super Mario Land's and Tetris' soundtracks play mostly fine apart from shorter note durations and ugly noise emulation.

Things to add in the future

• Fix the CPU, which has some opcodes slightly broken at the moment
• Fix & finish the APU, as the sound sometimes pops and clicks and not everything is supported
• Emulated window support (essentially a second movable background layer)
• Proper background/window/sprite rendering priority support
• More debug options, such as an on-the-fly RAM reader/writer

Assembler and disassembler

Additionally there are two Python scripts in the repository, one for assembling (assembler.py) and one for disassembling (disassembler.py). Documentation on those is still TODO.

Core Emulation Features

• Supports Game Boy (DMG), Game Boy Color (CGB) and GBC-Mode Game Boy Advance (AGB) emulation
• Supports accurate high level emulation of Super Game Boy (SGB; NTSC and PAL) and Super Game Boy 2 (SGB2)
• Lets you choose the model you want to emulate regardless of ROM
• High quality 96KHz audio¹
• Battery save support
• Save states
• Includes open source boot ROMs for all emulated models:
  • Complete support for (and documentation of) all game-specific palettes in the CGB/AGB boot ROM, for accurate emulation of Game Boy games on a Game Boy Color
  • Supports manual palette selection with key combinations, with 4 additional new palettes (A + B + direction)
  • Supports palette selection in a CGB game, forcing it to run in ‘paletted’ DMG mode, if ROM allows doing so
  • Support for games with a non-Nintendo logo in the header
  • No long animation in the DMG boot ROM
• Four settings of color correction
• Three settings of high-pass audio filters
• Real time clock emulation
• Game Boy Camera emulation²
• Game Boy Printer emulation³
• Turbo, rewind and slow-motion modes

Accuracy

• Extremely high accuracy
• Passes all of mooneye-gb’s acceptance tests, including Wilbert Pol’s tests
• Passes all of blargg’s test ROMs
• Emulates PCM_12 and PCM_34 registers
• T-cycle accurate emulation of LCD timing effects, supporting the Demotronic trick, Prehistorik Man, GBVideoPlayer and other tech demos
• Regularly tested against a suite of over 2900 games via automatic testing, with a success rate of over 99% on both DMG and CGB games
• Optional frame blending⁴
• Sample-accurate sound emulation, downsampled from 2MHz

User Interface

• Retina and High DPI display support, allowing a wider range of scaling factors without artifacts
• Several scaling algorithms⁴ (Including exclusive algorithms such as OmniScale) and filters
  • The OmniScale algorithms let you play games in 1080p, 4K and 5K resolutions!
• Customizable controls
• Joypad support
• Fullscreen support, optionally keeping aspect ratio

These features are currently exclusive to the macOS Cocoa port

• Native Cocoa interface, with support for all system-wide features, such as drag-and-drop and smart titlebars
• Quick Look integration; in-game screenshots appear in the Finder icons of Game Boy ROMs
• Use the Zoom button to resize to the next integer ratio

Debugging

• Advanced text-based debugger: (Learn more)
  • Traditional step/next/continue/finish flow control
  • Expression evaluator with assignment support, register and memory access, and symbol support
  • Disassembler with symbol support
  • Multiple conditional breakpoints, including jump-to breakpoints
  • Multiple conditional watchpoints
  • Call stack tracing
  • Tick counting
  • Cartridge and MBC information
  • Accurate APU and PPU information
• Memory viewer and editor³
• Video RAM viewer³

1. 44.1KHz in older versions of Windows ↩

2. Mac cleaner for lion. Only in the Cocoa macOS port; graphical noise is used instead of camera input in the SDL version ↩

3. Only in the Cocoa macOS port ↩↩²↩³

4. Requires OpenGL 3.2 or Metal support ↩↩²