From: Brian Candler <b.candler@...>
Date: 2012-03-04T05:48:32+09:00
Subject: Re: 8bits signed integer

You only need to do the modulo-256 once at the end.

test = 
"\x75\x63\x32\x21\x01\xA9\x94\x94\x94\x94\x94\x94\x94\x94\x94\x0a\x85"

puts (test.bytes.inject(:+) % 256).to_s(16)
#=> 98

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