Ehh... what do You mean? Schach-computer.info/wiki says all 3 models have the same hardware (SH7034 at 20Mhz) except hash tables bonus for Atlanta. Is it incorrect information?

And about Fritz-3 inside: an owner of MilanoPro told me that on the box there's a writting kind of "contains WCCC-1995 champion programm"

I see (haven't had a look to this base for a while) and still disagree. If we look at the SH7034 entry of our wiki, it shows several models - not only those w-w/o "hash". A lot depends on the "suffix", means the small term behind "SH7034". I really have to admit, that i dindn't had a look into my Atlanta or Milano Pro for a very long time and can't remember what type of CPU's are built in there. I will try my best to open both computers cases during next Saturday to find out the "true" CPU types, but i can't promise anything. Meanwhile i'd like you to answer a few small questions for yourselfes:

If it is possible to speed up an Atlanta from 20 to 40 MHz, why it is impossible to do the same with a Milano Pro or Master Chess? Both will end at approximately 27 MHz.
If you speed up an Atlanta and a Milano Pro (Master Chess), why is the Atlanta's clock running faster while the Milano Pro's clock still runs at real time?
If one or even both of the questions above get answered with "I dunno!", why should we assume these CPU's to be equal?

Please let us delay this discussion for a couple of days. On weekend i will try to find an answer to the CPU issue - during the week i'm unfortunately much to tired...Well, the box and the stickers can tell a lot...
Guido (ed_209) and i tried almost everything to find a prove for the engine versions of Atlanta and Milano Pro by comparison to any available Fritz version from 1.0 to 3.3 (or was it just 3.08?) and we found no final solution, even if we tried computers from 386SX-16 up to modern PC's - the ladder with several slow motions of course. Fritz 3 is noticeable stronger than Atlanta and by far stronger than Milano Pro - these engines are different for sure! A very close comparison but still no real "hit" is:

Milano Pro = a very early Fritz 2
Atlanta = something between Fritz 2.51 and Fritz 3 (but closer to the earlier version)

Maybe our problem to find a "match" is because the PC's have different access times to their memory and different times to work instructions. Furthermore we don't know how the engines were ported from system A to system B. If Frans used different compilers and languages (both most probably), we will never find any comparison. That's why we finally gave up on searching.

Kind regards, Wilfried