1-12 Technical InformationWith the standard 1 MB of video DRAM, the video hardware supports the followingresolutions, colors, and refresh rates: 1280 by 1024 pixels, 16 colors, 60 Hz 1024 by 768 pixels, 16/256 colors, 60 Hz, 66 Hz, 70 Hz, 72 Hz, and 75 Hz 800 by 600 pixels, 16/256/64K colors, 56 Hz, 60 Hz, 72 Hz, and 75 Hz 640 by 480 pixels, 16/256/64K/16.8 million colors, 60 Hz, 72 Hz, and 75 Hz.With 2 MB of video DRAM, the system supports the following additional resolutions,colors, and refresh rates: 1600 by 1200 pixels, 16/256 colors, 60 Hz and 70 Hz 1280 by 1024 pixels, 256 colors, 60 Hz, 72 Hz, and 75 Hz 1024 by 768 pixels, 64K colors, 60 Hz, 66 Hz, 70 Hz, 72 Hz, and 75 Hz 800 by 600 pixels, 16.8 million colors, 56 Hz, 60 Hz, 72 Hz, and 75 Hz.Interrupt ControllerThe interrupt controller operates as an interrupt manager for the entire AT systemenvironment. The controller accepts requests from peripherals, issues interrupt requests tothe processor, resolves interrupt priorities, and provides vectors for the processor todetermine which interrupt routine to execute. The interrupt controller has priorityassignment modes that can be reconfigured at any time during system operations.
