289 lines
12 KiB
HTML
289 lines
12 KiB
HTML
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<!DOCTYPE html>
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<article>
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<div id="topic-content" class="container-fluid"
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data-hnd-id="NESScrolling2"
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data-hnd-context="35"
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data-hnd-title="NES Scrolling 2"
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>
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<li><a href="Technicalinformation.html">Technical Information</a></li><li><a href="NESProcessor.html">NES Processing</a></li>
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<a id="main-content"></a>
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<h2>NES Scrolling 2</h2>
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<div class="main-content">
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<p class="rvps2"><span class="rvts6">nes scrolling</span></p>
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<p class="rvps2"><span class="rvts6"><br/></span></p>
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<p class="rvps2"><span class="rvts6">Date: Tue, 13 Apr 1999 17:48:54 -0600</span></p>
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<p class="rvps2"><span class="rvts6">From: loopy <zxcvzxcv@netzero.net></span></p>
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<p class="rvps2"><span class="rvts6">Reply-To: nesdev@onelist.com</span></p>
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<p class="rvps2"><span class="rvts6">To: nesdev@onelist.com</span></p>
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<p class="rvps2"><span class="rvts6"><br/></span></p>
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<p class="rvps2"><span class="rvts6">From: loopy <zxcvzxcv@netzero.net></span></p>
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<p class="rvps2"><span class="rvts6"><br/></span></p>
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<p class="rvps2"><span class="rvts6">(more notes on ppu logic)</span></p>
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<p class="rvps2"><span class="rvts6"><br/></span></p>
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<p class="rvps2"><span class="rvts6">you can think of bits 0,1,2,3,4 of the vram address as the "x scroll"(*8)</span></p>
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<p class="rvps2"><span class="rvts6">that the ppu increments as it draws. as it wraps from 31 to 0, bit 10 is</span></p>
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<p class="rvps2"><span class="rvts6">switched. you should see how this causes horizontal wrapping between name</span></p>
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<p class="rvps2"><span class="rvts6">tables (0,1) and (2,3).</span></p>
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<p class="rvps2"><span class="rvts6"><br/></span></p>
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<p class="rvps2"><span class="rvts6">you can think of bits 5,6,7,8,9 as the "y scroll"(*8). this functions</span></p>
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<p class="rvps2"><span class="rvts6">slightly different from the X. it wraps to 0 and bit 11 is switched when</span></p>
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<p class="rvps2"><span class="rvts6">it's incremented from _29_ instead of 31. there are some odd side effects</span></p>
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<p class="rvps2"><span class="rvts6">from this.. if you manually set the value above 29 (from either 2005 or</span></p>
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<p class="rvps2"><span class="rvts6">2006), the wrapping from 29 obviously won't happen, and attrib data will be</span></p>
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<p class="rvps2"><span class="rvts6">used as name table data. the "y scroll" still wraps to 0 from 31, but</span></p>
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<p class="rvps2"><span class="rvts6">without switching bit 11. this explains why writing 240+ to 'Y' in 2005</span></p>
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<p class="rvps2"><span class="rvts6">appeared as a negative scroll value.</span></p>
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<p class="rvps2"><span class="rvts6"></span><span class="rvts6"></span></p>
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<p class="rvps4" style="clear: both;"><span class="rvts18">Created with the Personal Edition of HelpNDoc: </span><a class="rvts19" href="https://www.helpndoc.com/feature-tour/create-ebooks-for-amazon-kindle">Free Kindle producer</a></p>
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</div>
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<div id="topic_footer"><div id="topic_footer_content">2020</div></div>
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</div> <!-- /#topic-content -->
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</article>
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<footer></footer>
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