VRAM Locations 2The 512KB display buffer on the main logic board consists of 2 VRAM chips. One of the

VRAM chips is located on the front of the main logic board and one is located on the back

of the board.

Note

The number of colors available in 16-bit mode is less than the theoretical

maximum due to the limitations in the color LCD technology. Many

color values exhibit noticeable flicker. The computer’s CLUT omits the

unsatisfactory colors, making about 4,000 available. See the Appendix,

“Color Lookup Table,” for more information.

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Flat Panel Display Circuitry 3The flat panel display circuitry in the Macintosh PowerBook 5300 computer emulates a

NuBus video card installed in slot $0. There is no declaration ROM as such; its

functions have been incorporated into the system ROM. The display circuitry includes

the new ECSC controller IC and a display buffer consisting of 1 MB of VRAM. The LCD

display is compatible with software that uses QuickDraw and the Palette Manager. The

display supports color table animation.

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Flat Panel Display Circuitry 3The flat panel display circuitry in the PowerBook 1400 computer emulates a NuBus™

video card installed in slot $0. There is no declaration ROM as such; its functions have

been incorporated into the system ROM. The display circuitry includes the new ECSC

controller IC and a display buffer consisting of 1 MB of VRAM. The LCD display is

compatible with software that uses QuickDraw and the Palette Manager. The display

supports color-table animation.

An ECSC (enhanced color support chip) IC provides the data and control interface to the

LCD panel. The ECSC IC contains a 256-entry CLUT, RAMDAC, display buffer

controller . . .

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