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11111111 = 255 in standard binary. think of it like so: 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 1 1 1 1 1 1 1 1

in other words, (1x128) + (1x64) etc. etc. In Signed Binary however, this would equal -127 since in signed binary, the first bit represents the sign for plus or minus. e.g 0 = +, 1 = -. as such: Plus or minus | 64 | 32 | 16 | 8 | 4 | 2 | 1 1 (-) 1 1 1 1 1 1 1

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