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== Video system == The MC6847 Video Display Generator provided text (32ร16) and graphics up to 256ร192 monochrome, across nine modes from 64ร64 in four colours to 256ร192 monochrome. The MC6847 is a 60 Hz NTSC device, so on European 50 Hz sets the standard machine produced a monochrome picture; an Acorn 50 Hz PAL colour card (Acorn drawing 102,006-C) was available to add colour.<ref name="wp" /> Output was via a UHF modulator (channel 36); a composite-video output was available by modification.
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