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The '''BIFROST* Engine''' is a multicolour 8×1 graphics engine written by [[User:Einar|Einar Saukas]], released with demo graphics by Dave Hughes, supporting a multicolour square area with
22 character rows by 18 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/infoseekid.cgi?id=0027405 here].
It natively supports all standard Spectrum models (48K, 128K, +2, +2A, +2B, +3). Moreover, engine logos can be obtained [http://www.worldofspectrum.org/forums/showthread.php?t=44660 here].