Most books from the early days were essentially that, although they weren't called that because it was just assumed. The K&R is, in a way, even if it doesn't mention assembly. It's obvious to see how a for loop relates to the assembly instructions (of course it isn't today, with all the trickery compilers do underneath).
Yeah, K&R assumes at least some familiarity with assembly programming - it uses assembly-level terms like "address" and "register", without ever defining what they mean. The chapter on pointers starts out with:
"A pointer is a variable that contains the address of another variable." [1st edition, 1978]
