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24 lines
1.1 KiB
Markdown
24 lines
1.1 KiB
Markdown
copper bars
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===========
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Now I discover how vertical copper waiting works.
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Some notes:
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1. The first line is copper address $2c
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2. The last last is copper address $2c + 256 (screen height) = $12c
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At copper line 255 ($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)
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[copper_gen.c](copper_gen.c) will generate a full screen 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 different patterns by changing the algorithm parameters.
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Also in this example I have remove interrupt processing and disabled most of the interrupts.
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screenshot
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----------
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try it
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------
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* [Download disk image](bin/copper_bars.adf?raw=true)
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* <a href="http://alpine9000.github.io/ScriptedAmigaEmulator/#amiga_examples/copper_bars.adf" target="_blank">Run in SAE</a>
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