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Why does the Blitter use this odd symmetry for the octants in line-drawing mode? And why doesn't the HWRM explain clearly that it's a hardware implementation of the Bresenham line-drawing algorithm?
I'm guessing that HW implementations of Bresenham were patented back in those days, they (or Jay Miner) weren't interested in licensing or paying royalties, and this way they could avoid getting sued. But with Jay Miner gone we may never know.
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