This article has been moved or is in the process of being moved to the Sinclair FAQ Wiki, under the "ULAplus" article. You may find more complete information there.

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.

ULAplus rgb

G3R3B2 encoding

ULAplus hsl

Offset H(S)L encoding

ULAplus cmyk

CMYK (little-endian) encoding

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