05-15-2013, 06:50 AM
Yes, rotations are important. I'm using rotation to calculate screen address from line. You just need to change bits 0-2 with 3-5 to get the address that can be multipied with 32 (bitshift 5 times to left) and added 16384 or 49152 to get the address in screen memory. This all can be done much easier in binary.
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