It would appear that 160 (0xA0) is the start marker for one of the ranges of double-byte symbols in (S?)JIS.
I would hazard a guess that if you then put an 'invalid' second byte after it, something in the code is throwing a wobbly. This, of course, is a _lot_ of assumption. I don't know what Khaled's code does with input multibyte chars; how it handles them. I also only have a passing awareness of how double-byte CJK (SJIS, BIG5, etc) actually encode the characters.
