Prompt Logic technology guides the user through various functions in a snap. Loan Wizard quickly and easily calculates installment loan payments. Enter any two variables of cost-sell-margin and the third automatically appears. Two independent tax keys allows you to program two different tax rates. HELP key explains features on the display an in print. Text keys store and print up to six custom messages on your tape printout. Power Source(s): AC; Display Notation: Numeric; Number of Display Digits: 14; Display Characters x Display Lines: N/A.