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Originally Posted by squareD
?? -> NEG -> ROR 6 = 45
?? -> NEG -> ROR 7 = 37
?? -> NEG -> ROR 3 = 30
In my opinion it's impossible to get out these values by using only one byte.
But may be that I'm wrong.
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Why do you think it's impossible? You are probably mixing up bit shifting and bit rolling. ROL/ROR move the bit that drops out of the byte into the other end of the byte. Maybe an example helps:
0x30 -> b00110000, ROL (inversion of ROR) that three times, you get:
0x60 -> b01100000
0xC0 -> b11000000
0x81 -> b10000001
You must not try to just multiply by 2 here
This is the essential difference between ROR/ROL and SHR/SHL