CMU Common Lisp objects are 32 bits long. The high-order bit of each word is numbered 0; the low-order bit is numbered 31. If a word is broken into smaller units, these are packed into the word from left to right. For example, if we break a word into bytes, byte 0 would occupy bits 0-7, byte 1 would occupy 8-15, byte 2 would occupy 16-23, and byte 3 would occupy 24-31.
All CMU Common Lisp documentation uses decimal as the default radix; other radices will be indicated by a subscript (as in 778) or by a clear statement of what radix is in use.