The '''BIFROST*2 Engine''' is a multicolour 8×1 graphics engine written by [[User:Einar|Einar Saukas]], supporting a multicolour square area of (at most) 22 character rows by 20 character columns. It's open source and royalty-free (even for commercial programs). Further details can be found in [http://www.ime.usp.br/~einar/bifrost/ this link]. The latest version is available for download [
http:// www. worldofspectrum. org/forums/discussion/52389/ here].
It natively supports all standard Spectrum models (48K, 128K, +2, +2A, +2B, +3).