GigaScreen / DithVIDE / BZither edit GigaScreen ZX Spectrum screen The attributes (colours) of an image are alternated at 50 Hz on the screen.[48] This way, the palette is increased to approximately 36 colours.[49] It's possible to switch screen per scanline and thus mix the screens, but this is very CPU intensive and needs exact and steady timings. With real tstate precise software its possible to simulate a GigaScreen on an 128k "toastrack" original 128k ZX Spectrum.[50]By alternating between two screens on every frame interrupt (50 Hz), it is theoretically possible to simulate a doubling of the vertical display resolution from 192 to 384 lines.
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