REFRACT / a ZX Spectrum Next core for web browser

The Spectrum matrix is mapped directly. Shift is CAPS SHIFT, Ctrl or Alt is SYMBOL SHIFT, Backspace is CAPS+0. Arrow keys drive the Kempston joystick on port $DF and Ctrl fires; 5–8 still work as the Sinclair cursor keys.

Snapshots that call ROM routines need a real ROM — drop a .rom file on the screen and it fills all four slots. The built-in stub only covers the IM 1 interrupt handler and the esxDOS API.

If a game streams assets from the SD card, use Mount game folder first, then load the snapshot. The folder is read in your browser and served to the program's file calls — game/level1.bin opens exactly as it would on hardware. Nothing is uploaded.