How this conversion works
7F is 127 in decimal — the highest value of a signed byte and the last code point of 7-bit ASCII (the DEL character). One more and an 8-bit signed number goes negative.
Each base just uses a different set of digits for the same quantity. Reading
7f as a hexadecimal number gives the decimal value
127; expressing that same value in base two, eight or sixteen
produces the rows above. To convert any number between bases — including custom bases from 2
to 36 — use the number base converter.