Macintosh IIvx: Displays Larger than 14 Inches

Why doesn't the Macintosh IIvx support monitors larger than 14 inches?
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The Macintosh IIvx (Performa 600) has internal video support for the 12-inch, 13-inch, 14-inch, and VGA (Video Graphics Array) displays. However, the internal video doesn't support monitors greater than 14 inches.

Macintosh IIvx video logic is based on the Macintosh LC II. Time to market urgency made major alterations of the Macintosh LC ASIC impossible.

Customers must purchase an appropriate NuBus Card such as the Macintosh Display Card 8*24 to drive their larger monitors.
Published Date: Feb 19, 2012