> The ARM7 is said to be able to perform 64 bits = 32 bits * 32 bits
> multiplications, such as in the UMULL instruction, say: 
>         umull   r2,r4, r1, r3
> 

Wrong.  The ARM7M can do umull, chips befor that can't.  The only ARM in a 
RISC PC with support for that instruction is a StrongARM.

R.