ROMs

The Oric Atmos system requires one ROM:

ROM name	File	Mapping	Size	SHA-1
basic	basic11b.rom	$C000-$FFFF	16,384 bytes	9451a1a09d8f75944dbd6f91193fc360f1de80ac

This is the Atmos BASIC 1.1b firmware. The character patterns used by the ULA live in RAM and do not require a separate character-generator ROM.

Important

The Oric ROM is copyrighted firmware. The emulator does not grant a licence, and an online archive being publicly reachable does not prove that it is authorized to redistribute the ROM. Download or use it only if you own an Oric Atmos or otherwise have permission to possess and use the firmware.

Downloading or supplying the ROM

The Avalonia and Terminal configuration views can fetch basic11b.rom from the RetroBIOS Oricutron collection. It displays an explicit ownership/licence acknowledgement before downloading and validates the result against the SHA-1 above. The ROM is not bundled with the emulator.

You can instead select a local .rom or .bin file in the configuration view. Desktop hosts look in the following default directory:

• macOS/Linux: ~/Documents/Highbyte/DotNet6502/roms/Oric
• Windows: %USERPROFILE%\Documents\Highbyte\DotNet6502\roms\Oric

Avalonia Desktop, Terminal, and Headless store the same SystemConfig payload under a host-specific section key:

• Highbyte.DotNet6502.Oric.Avalonia
• Highbyte.DotNet6502.Oric.Terminal
• Highbyte.DotNet6502.Oric.Headless

For example, the Avalonia Desktop default is:

"Highbyte.DotNet6502.Oric.Avalonia": {
  "SystemConfig": {
    "VSyncHackEnabled": false,
    "ROMs": [
      { "Name": "basic", "File": "basic11b.rom" }
    ]
  }
}

The browser host keeps an uploaded or downloaded ROM in browser storage.