Full Screen Calculator is a huge calculator that occupies the entire full screen of your computer, and why do you need a calculator to occupy the entire screen? because it shows you all the history of operations that you have been doing, so if you want to correct a specific operation you only have to access the moment you made it and correct that error, without having to start again from the beginning to do all the operations mathematics.
Full Screen Calculator allows backups (backups) of the different histories of the operations carried out up to that moment.
Curiously it works under MSDOS environment.
You can free download Full Screen Calculator 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.