Thanks @x16wda @flamerz
OpalCalc looks nice, requires .net 3.5, the most smaller and featured .net notepad calculator at moment.
OpalCalc although is "small, 1mb~ requires .net 3.5 and uses 18mb~ ram
However CalcTape have a "modern" interface which it doesn't look bad at all, and I don't see any .net as requirement.
indeed CalcTape installed is 29mb~
but are: CalcTape.exe 9.8mb~ and 20mb~ in dll wich are just translations, you can eliminate those you don't want.
CalcTape uses 4.5mb~ ram
so CalcTape have nice features, translations, without .net requirements and uses less ram.
is winning CalcTape