Please define which assembly you are talking about. Older CPUs didn't trap on undefined opcodes (I'm talking things like the 8080, Z80, 6502, 6809, etc). And

Please define which assembly you are talking about. Older CPUs didn't trap on undefined opcodes (I'm talking things like the 8080, Z80, 6502, 6809, etc). And even on a more modern CPU (say, the x86 line) I see that the condition flags after a DIV are all undefined (Z, C, S, O, all undefined; also, MUL also leaves the flags undefined). But yes, assembly languages tend to be more defined than C.