RetroArch WASM-4 Core: BIOS, Features, and Setup Reference

WASM-4 is a low-level fantasy game console for building small games with WebAssembly, and RetroArch ships a WASM-4 core for running that content. This article summarizes what the official libretro documentation states about the core: BIOS requirements, feature support, directory behavior, aspect ratio and options. It is a source summary rather than a hands-on tested setup guide.

Prerequisites and BIOS

The core does not require BIOS or bootrom files to work, so there is no firmware prerequisite to satisfy before loading content.

The WASM-4 core does not create any directory of its own.

Documented feature support

The official documentation lists the core as supporting Restart, Screenshots, Saves, Save States, Rewind, Netplay, Controls and Remapping. It lists Core Options, memory monitoring for achievements, RetroArch cheats, native cheats, Multi-Mouse, Rumble, sensors, camera, location, subsystem, softpatching, disk control, username display and crop overscan as unsupported.

• Supported: Restart; Screenshots; Saves; Save States; Rewind; Netplay; Controls; Remapping. Not supported: Core Options; memory monitoring (achievements); RetroArch Cheats; Native Cheats; Multi-Mouse; Rumble; Sensor/Sensors; Camera; Location; Subsystem; Softpatching; Disk Control; Username; Crop Overscan.

Aspect ratio and core options

The core-provided aspect ratio is 1/1, i.e. a square picture.

The core exposes no Core Options, which is consistent with the feature list marking Core Options as unsupported.

What the documentation does not cover

The official page does not document a step-by-step installation or content-loading procedure in a form summarized here, so no setup steps are invented. Where behavior is not listed above, it remains unknown from this source.