DeskCalc is the perfect replacement for your Desktop Adding Machine
It is a paper tape adding machine that comes packed with a modern interface and many useful features for business managers, accountants and number crunchers.
What makes DeskCalc more useful than the average Windows calculator is the combo of paper tape, digital, of course, with an option for notes for each line item in the calculation tape, and calculations can be saved, exported to Excel, or annotated to PDF etc.
DeskCalc works much like the old adding machine calculators with paper tape except that you can enter comments anywhere on each line of numbers. It even allows you add or delete lines within the calculation and have results updated automatically, much like a spreadsheet.