This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Color Digit Multiplier (when 3rd band) Example Black 0 x1 -- Red Red Black = 22 Ohms Brown 1 x10 -- Blue Grey Brown = 680 Ohms Red 2 x100 -- Orange White Red = 3900 Ohms Orange 3 x1000 -- Yellow Violet Orange = 47k Ohms Yellow 4 x10000 -- Red Green Yellow = 250k Ohms Green 5 x100000 -- Orange Orange Green = 3.3M Ohms Blue 6 x1000000 -- Red Yellow Blue = 24M Ohms Violet 7 x10000000 -- ... Grey 8 x100000000 White 9 x1000000000 Gold - x 0.1 -- Brown Brown Gold = 1.1 Ohms Silver - x 0.01 -- Orange White Silver = 0.39 Ohms Tolerance (4th band) Red is <5% (courtesy of Edhel Iaur) Gold is 5% Silver is 10% no color is 20% Example: Grey Red Orange Gold is 82k Ohms +/- 5% Example: Brown Black Green Silver is 1M Ohms +/- 10% Note: carbon resistors almost always err on the high side. By: Rubywand
 
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