Because the converter ain't all that hard, once you get enough people like Stig to 'splain this stuff to ya.
Try this:
(ascii "a")
(chr 97)
The following is an eight bitcode representation of binary numbers.
I think the Chinese wrote this stuff, since you read it from right to left.
128_64_32_16_8_4_2_1 = bit code flags
__0__0__0__0_0_0_0_0 = binary representation of flags. 0 = off 1 = on
64+32+1= 97
01100001 = 97
(chr 97) = a
The negative thing should be self explanatory.