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Update README.md

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004.copper_bars/README.md
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@ -7,6 +7,6 @@ Some notes:
1. The first line is copper address $2c
2. The last last is copper address $2c + 256 (screen height) = $12c
At copper line 255 ($FF), we run out of bits in the copper wait instruction, so if we want to wait for lines after this, we need to wait for a wrapped value. [See here](http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node004D.html)
At copper line 255 ($FF), we run out of bits in the copper wait instruction, so if we want to wait for lines after this, we need to wait for a wrapped value. [See hardware reference manual details here](http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node004D.html)
[copper_gen.c](copper_gen.c) will generate a copper list with horizontal bars. See http://krazydad.com/tutorials/makecolors.php for details on the algorithm used to generate the bars. You can generate all sorts of different kinds of patterns by changing the algorithm parameters.