Two screens, a stylus and a microphone in one small window. melonDS runs DS titles well once the layout, the firmware and the input profiles are set.
Point melonDS at the **DS firmware and BIOS files** from your own console, pick a **screen layout that keeps both screens readable**, and map **touch input plus the stylus** before the first game.
Several DS titles refuse to boot or save without the console firmware. Point the emulator at the dumped files once; the settings page reports which of them are found and which are missing.
Config > Emu settings > DS firmwareVertical stacking keeps both screens at native proportions; side by side suits a widescreen monitor. Integer scaling avoids the uneven pixels that make DS text look smeared.
View > Screen layoutSet the D-pad and buttons first, then the touch layer: the mouse acts as the stylus, the left click as a tap. Save the mapping as an input profile so a second game does not start from scratch.
Config > Input and hotkeysThe OpenGL renderer with a 2x internal resolution is the sweet spot on modern hardware. Leave the software renderer for the rare title with a graphics glitch, not as a default.
Config > Emu settings > Renderer: OpenGL, 2xMost games detect their save type automatically. Titles with a real-time clock, such as the life simulations, behave oddly if the emulated clock resets at every launch, so leave the RTC running.
Config > Emu settings > RTCBoot a game that needs the microphone and one that needs a closed lid. Both are single menu entries in melonDS, and finding them before a puzzle needs them saves an evening.
System > Microphone / Lid closeThe firmware or BIOS files are missing or from the wrong region. Check the emulator's settings page for the file list.
The save directory points into the emulator folder that gets replaced on update. Move it to a permanent folder.
The screen layout and the input mapping disagree. Set the touch area for the layout you actually use.
The audio buffer is too small for a power-saving CPU state. Raise the buffer and set the power plan to balanced or higher.
Local wireless works between instances over a network, but it is fussy. Test with two games you do not care about first.
For most titles yes, at least the BIOS files. A few homebrew ROMs boot without them.
Delete the melonDS configuration folder; the emulator creates it again on the next start. Game files and firmware dumps are not touched.
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