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Color Display Monitor of a Personal Computer (Pc) Having a Different Color Palette When the PC Is Connected to a Host Processor

IP.com Disclosure Number: IPCOM000040699D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bertram, RL: AUTHOR [+3]

Abstract

When a personal computer (PC) is connected to a host processor, its color palette is altered to provide intensified colors to support display of information coming from the host processor, which may be a mainframe computer or another PC, for example. When the PC functions with no host processor, a different color palette is provided. When a PC is connected to a host processor through a "hot key," which alternately switches between two programs with one being in the host processor and the other in the PC, a different color palette is employed because the host processor requires intensified colors. During the PC's initialization sequence, the lower eight color registers are initialized with eight colors and the upper eight color registers are initialized with the same eight colors intensified.

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Color Display Monitor of a Personal Computer (Pc) Having a Different Color Palette When the PC Is Connected to a Host Processor

When a personal computer (PC) is connected to a host processor, its color palette is altered to provide intensified colors to support display of information coming from the host processor, which may be a mainframe computer or another PC, for example. When the PC functions with no host processor, a different color palette is provided. When a PC is connected to a host processor through a "hot key," which alternately switches between two programs with one being in the host processor and the other in the PC, a different color palette is employed because the host processor requires intensified colors. During the PC's initialization sequence, the lower eight color registers are initialized with eight colors and the upper eight color registers are initialized with the same eight colors intensified. Then, a program initializes the lower eight color registers to the specific colors that it uses. These specific colors are six unintensified colors and two intensified colors. The upper eight color registers are not altered. Thus, one of the bits in the attribute byte, which has all the information on how a character is to be displayed, associated with each character has its state determine whether the colors in the lower or upper color registers are used. When the program in the PC is employed, the colors in the lower eight color registers are used....