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Attribute Memory for Display Adapter Disclosure Number: IPCOM000043593D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05

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Landers, JD [+details]


This article describes a display adapter which use a minimum number of eight-bit words to represent displayable characters and character attributes, such as reverse video, blinking or intensify. A separate, small attribute RAM (random-access memory) is provided. This RAM has one bit for each display screen location . If the bit is on, data stored in a character RAM represents an attribute. Referring to the drawing, the display adapter has two separate random-access memories. Memory 10 stores data representing both displayable characters and attributes for those characters. Attribute memory 12 stores data indicating an attribute is to exist at a particular screen location. Memories 10 and 12 use eight-bit words.