Yes, it is true. This was announced at the introduction of Macintosh LC.
The product is called the Macintosh LC 512K VRAM SIMM (M0517LL/A) and was
made available in February 1991.
The standard Macintosh LC and the new Macintosh LC II support these video
configurations:
- Macintosh 12-Inch Monochrome Display: 2, 4, or 16 shades of gray
- Macintosh 12-Inch RGB Display: 2, 4, 16, or 256 colors
- AppleColor High-Resolution RGB Monitor (13-inch): 2, 4, or 16 colors
With the Macintosh LC 512K VRAM SIMM (M0517LL/A) installed, the Macintosh
LC and Macintosh LC II support these video configurations:
- Macintosh 12-Inch Monochrome Display: 2, 4, 16, or 256 shades of gray
- Macintosh 12-Inch RGB Display: 2, 4, 16, 256, or 32,000 colors
- AppleColor High-Resolution RGB Monitor (13-inch): 2, 4, 16, or 256
colors
Note
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The Macintosh LC and LC II do not support full 16-bit color, which allows
over 65,000 colors.