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Fragment of full-color image (left) vs Amiga HAM (right) Hold-And-Modify, [1] [2] [3] usually abbreviated as HAM, [4] is a display mode of the Amiga computer. [5] It uses a highly unusual technique to express the color of pixels, allowing many more colors to appear on screen than would otherwise be possible.
A usable file import-export capability was included. The system could do outlines, mail merge from its own addresses, and allowed the user to change colors of display elements. The basic system woke up with a calendar display. It could look like a day planner view or a month calendar.
The Atari ST series has a digital-to-analog converter of 3-bits, eight levels per RGB channel, featuring a 9-bit RGB palette (512 colors).Depending on the (proprietary) monitor type attached, it displays one of the 320×200, 16-colors and 640×200, 4-colors modes with the color monitor, or the high resolution 640×400 black and white mode with the monochrome monitor.
It is best to choose background colors that offer sufficient contrast in relation to text and blue links, which is also the color of references, both of which are very common in most articles. Use the WCAG link contrast checker to ensure that the chosen background color offers the recommended WCAG AA level of contrast against normal text ...
Since these new colors are the result of cross-color artifacting, they are often called "artifact colors". Both the standard 320×200 four-color and the 640×200 color-on-black graphics modes could be used with this technique. Early efforts resulted on a usable resolution of 160×200 with 16 colors. [24]
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]
A BIOS Color Attribute is an 8 bit value where the low 4 bits represent the character color and the high 4 bits represent the background color. The name comes from the fact that these colors are used in BIOS interrupts, specifically INT 10h, the video interrupt. When writing text to the screen, a BIOS color attribute is used to designate the ...
limit modifying the color palette to one color per line. In 4 color mode, per logical line one foreground and one background color could be selected, so each line element or logical pixel could be represented by one bit. In 16 color mode, the color palette was inherited from the previous line. Only one of the four usable colors could be changed.