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The '''NIRVANA Engine''' is a 'bicolour' (multicolour 8×2) graphics engine written by [[User:Einar|Einar Saukas]], supporting a multicolour square area
of 22 character rows by 30 character columns. It's open source and royalty-free (even for commercial programs). Further details can be found in [http://www.worldofspectrum.org/forums/showthread.php?t=45538 this thread]. The latest version is available for download [https://www.dropbox.com/sh/bgtoq6tdwropzzr/AAAknv_0PeJGhn36dLJZfGASa here].
It natively supports all standard Spectrum models (48K, 128K, +2, +2A, +2B, +3). It was also ported to Pentagon machines by Denis Grachev and Einar Saukas, available [http://www.worldofspectrum.org/forums/showpost.php?p=768848&postcount=215 here]. Moreover, engine logos can be obtained [http://www.worldofspectrum.org/forums/showthread.php?t=47436 here].