As was mentioned above, The mapping of value 65 to the character "A", is just because you're using a computer that's configured for a character encoding that makes this true.

If your machine was using EBCDIC, the value 65 would map to a Non-breaking Space.

Your mapping of 65 to "A" is not much of a surprise because many modern character encodings are build as a superset of the 7 bit ASCII encoding. It's not uncommon to see folks using the "Latin" code pages that have this property, as does UTF-8. Any of these choices are common.