PS-2 video programming Wilton, Richard

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Wilton, Richard
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Microcomputers -- Design and construction; Business; Specifications
The IBM PS-2 line of PCs offers two new system board-based video systems, the multicolor graphics array (MCGA) and the video graphics array (VGA), which are respectively similar in visual appearance to previous CGA and EGA standards. The two new video adapters, though, require an analog monitor. MCGA works with the PS-2 Model 30, while VGA is provided with Models 50, 60, and 80. Programs that ran on CGA will run, unchanged, on MCGA, while EGA programs will run on VGA systems. MCGA and EGA have different I-O port assignments and layout of video RAM. Other details of the video systems, their subsystems, and their functioning are extensively described. Several programming techniques for the MCGA and VGA environments are also described.
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