Abstract: A character-based display controller, which is capable of providing variable width text characters, includes a ROM embedded with pattern and attribute codes, and a logic control circuit enabling multiple modes of interpreting the data in the character memory. The logic control circuit also enables bypassing the character memory thereby permitting a bit-mapped display mode.

Abstract: An interface circuit for translating digital signals signifying colors in any of various color formats into analog signals for controlling respective primary colors of a display monitor operating in a standard R, G, B primary color format. The circuit adds a control bit to each digital signal identifying the color format of the signal, and each of the colors signified by respective digital signals are identified by digital words corresponding thereto stored in a digital memory. The bits of each stored word control respective levels of analog signal attenuation in analog summing networks for converting each of such words into respective R, G, B analog signals for the video monitor. Changing the value of the control bit changes the word read-out from the memory in accordance with the particular color format of the received digital signals.