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< p class = "rvps2" > < span class = "rvts6" > nes scrolling< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > < br / > < / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > Date: Tue, 13 Apr 1999 17:48:54 -0600< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > From: loopy < zxcvzxcv@netzero.net> < / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > Reply-To: nesdev@onelist.com< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > To: nesdev@onelist.com< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > < br / > < / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > From: loopy < zxcvzxcv@netzero.net> < / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > < br / > < / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > (more notes on ppu logic)< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > < br / > < / span > < / p >
< 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 >
< 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 >
< p class = "rvps2" > < span class = "rvts6" > switched. you should see how this causes horizontal wrapping between name< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > tables (0,1) and (2,3).< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > < br / > < / span > < / p >
< 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 >
< p class = "rvps2" > < span class = "rvts6" > slightly different from the X. it wraps to 0 and bit 11 is switched when< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > it's incremented from _29_ instead of 31. there are some odd side effects< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > from this.. if you manually set the value above 29 (from either 2005 or< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > 2006), the wrapping from 29 obviously won't happen, and attrib data will be< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > used as name table data. the "y scroll" still wraps to 0 from 31, but< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > without switching bit 11. this explains why writing 240+ to 'Y' in 2005< / span > < / p >
< p class = "rvps2" > < span class = "rvts6" > appeared as a negative scroll value.< / span > < / p >
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