I think this is true for any bus/register size. Various high-level language "bignum" libraries generalize to any size. But it's true that with only 8 bits, the

I think this is true for any bus/register size. Various high-level language "bignum" libraries generalize to any size. But it's true that with only 8 bits, the problem happens very soon. However, if one doesn't want to solve basic problems "the hard way", one probably won't be interested in assembly programming anyway.