![]() On display devices that accept an analog RGB input directly (TVs with a SCARTEuro-AV connector), the upscaler can be omitted, but only if the input video signal is conformant with the PAL (15.625kHz HSYNC, -50Hz VSYNC) or CGANTSC standard (15.75kHz HSYNC, 60Hz VSYNC), and the TV supports it. The fourth shade, which was not always supported, was setting the video line low with high intensity line high, yielding dark greenambergray, depending on the phosphor.Ĭonnecting this to a suitable HDMI or VGA upscaler, to scale up the resolution, yields a video signal that is compatible with more modern displays and does not require a vintage monitor, which relies on the slower horizontal sync frequencies (newer monitors dont go that low on HSYNC). On a monochrome display, like the IBM MDA or Hercules, three and sometimes four shades, could be used to display text or graphics.ĭepending on the monochrome monitor used, this was either green, amber or gray: video line low (black), video line high (greenambergray) and video line high with high-intensity line high (light greenambergray). Later, this limit was surpassed by switching the palettes andor varying the Intensity for four levels, instead of two (low and high intensity), to a maximum of 64 colors.
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