ULAplus is a specification for a proposed hardware replacement for the Spectrum ULA. The current specification includes four colour modes: 0 - original spectrum behaviour 1 - RGB (see ZX Spectrum 64 Colour Mode) 2 - HSL (not yet finalized) 3 - CMYK Any hardware implementing ULAplus must implement at least mode 0 and one other mode to be considered a ULAplus device. File:ULAplus rgb.pngFile:ULAplus hsl.pngFile:ULAplus cmyk.png