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The Apple II's Hi-Res mode was peculiar even by the standards of the day. While the CGA card released four years after the Apple II on the IBM PC allowed the user to select one of two color sets for creating 320×200 graphics, only four colors (the background color and three drawing colors) were available at a time. By contrast, the Apple ...
Apple IIGS, along with full compatible graphic modes with the Apple II, features a custom Video Graphics Chip (VGC) [1] which supports a 12-bit RGB, 4,096-color palette. It has an extended set of 320×200 and 640×200 graphic modes, (called Super High-Res modes by Apple) with different (and a bit complex) color modes:
Fragment of an Apple II computer screen, showing the actual pixel data composed of vertical stripes (top) and the resulting colors when seen on an NTSC TV (bottom) Color graphics on the Apple II uses a quirk of the NTSC television signal standard, which made color display relatively easy and inexpensive to implement. [31]
Apple II (1977) "Low" (text block) 16-color, "high resolution" (140x192 bitmap) 6-color and "double high" 16-color (NTSC artifact based; actually 280×192 monochrome) graphic modes. VIC-20 (1980) 200 definable characters of 8×16 pixels each, 8 or 10 color palette modes with 2 colors per character cell. CGA for IBM-PC (1981)
This is a list of software palettes used by computers. Systems that use a 4-bit or 8-bit pixel depth can display up to 16 or 256 colors simultaneously. Many personal computers in the early 1990s displayed at most 256 different colors, freely selected by software (either by the user or by a program) from their wider hardware's RGB color palette.
In the 8-color high-res mode, every 8×8 pixels can have the background color (shared for the entire screen) or a free foreground color, both selectable among the first eight colors of the palette. In the 10-color multicolor mode, a single pixel of every 4×8 block (a character cell) may have any of four colors: the background color, the ...
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In addition to supporting all the text and bitmapped Apple II graphics modes of earlier models, the Apple IIGS's Video Graphics Chip (VGC) introduced a new "Super-High Resolution" mode with a vastly wider color palette and no color bleeding and fringing. Super-High-Resolution supports 200 lines, in either 320 or 640 pixels horizontally.