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The color palette data is not stored in memory per se, but rather modified, read and written to by low level I/O port calls, to the DAC registers. The palette data was often copied from the low level ports one at a time to a spot in memory after the screen data so the colors could be saved along with the pixels they belonged to.
Orange artifact color, generated from white and black pixels, on the TRS-80 Color Computer Example of artwork created with the intent of having individual pixel values horizontally averaged over composite video. Composite artifact colors is a technique commonly used to address several graphic modes of some 1970s and 1980s home computers.
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.
Prometheus' sound cards soon found use in prebuilt computer systems manufactured by IBM and DEC. [ 6 ] Sales of Prometheus' modems cooled considerably in the early 1990s, the company trailing behind the growing pace of advancements in modem bit rates and hampered by quality control issues stemming for slow communication with their Taiwanese ...
The exact amount of reduction differed between monitor models: the original IBM 5153 Personal Computer Color Display reduces the green signal's amplitude by about one third, [12] while the IBM 5154 Enhanced Color Display internally converts all 4-bit RGBI color numbers to 6-bit ECD color numbers, [8] which amounts to halving the green signal's ...
Mark Dean, an African-American computer scientist and engineer, spent over 30 years at IBM pursuing the Next Big Thing. ... laid the groundwork for color PC monitors and led the team that created ...
Each screen character is represented by two bytes aligned as a 16-bit word accessible by the CPU in a single operation. The lower (or character) byte is the actual code point for the current character set, and the higher (or attribute) byte is a bit field used to select various video attributes such as color, blinking, character set, and so forth. [6]
The Hercules Graphics Card (HGC) is a computer graphics controller formerly made by Hercules Computer Technology, Inc. that combines IBM's text-only MDA display standard with a bitmapped graphics mode, also offering a parallel printer port. [1] [2] This allows the HGC to offer both high-quality text and graphics from a single card.