On 11/3/2014 10:32 AM, Valeri Galtsev wrote: > So, I would just echo what you said: we hardly will see the need in 128 > bit CPUs soon. (BTW, I'm glad to hear the choice which is power of 2. As, > in general, the length of CPU word can be anything: 17, 89, ... I'm not > mentioning 1 which is used in calculators, as 1_is_ power of 2;-) I don't think any computer architectures have used word sizes other than a power of 2 multiple of bits in quite a long time, like since the 1960s. the DECsystem 10 and 20 were 36 bit word machines. The PDP8 was a 12 bit architecture. there are some low end embedded processors that are 4 bit (but thats a power of 2, also) but virtually everything resembling general purpose computing equipment in use today is 8/16/32/64 bits. note I'm speaking of data size, I know there are numerous 'Harvard' architecture (separate code and data space) embedded machines with odd instruction word sizes. Even most of these use 4/8/16 word sizes. -- john r pierce 37N 122W somewhere on the middle of the left coast