Tim Hotze wrote: Riccardo quoted Tony Duel as having written: I think some of you have misinterpreted Tony's question. He was asking about word lengths. I do not believe that the Texas 99 series had a word length of 9 bits (16 wasn't it?) The Intel 8088 was 8 bits, the 8086 16; the 80x87, as I recall, are 80 bits internally (another one for your list, Tony, if coprocessors count!) I believe that there are some CPU chips now with 64-bit internal buses. Any advance on 64? At the other end, do the processors in the AMT DAP count as 1-bit machines? Or are they bit-slices of a 32 bit machine? Or a 1024 bit machine? Philip.