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-0 and +0  is same in signed bit  ?   and why we can not store -129 in 8 bit storage

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Only 2's complement representation in the signed magnitude notation of number has unique representation of 0.

Neither signed bit nor 1's complement has unique representation of 0.

e.g. we have 5 bit number and we are following signed bit notation so +0 will be represented as 00000 in binary whereas -0 will be represented as 10000, thus making notation of 0 different in signed bit representation.
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