A programmable desktop calculator designed for business, scientific, and engineering work. A key feature was its punched-card programming system. Users could enter a program through the keyboard or prepare cards and feed them into the built-in reader. Each card held up to 40 program steps, while the calculator’s internal storage held 240 steps, optionally divided into two sections of 120. Cards provided a practical way to keep a library of programs for later use. Programming went beyond simply replaying keystrokes. A program could test whether a result was negative, jump to another instruction, repeat a calculation, or call a reusable subroutine. The calculator could pause for new input and then continue processing—a useful arrangement for entering successive quantities and prices. CANON also offered prepared program cards for trigonometry, logarithms, coordinate conversions, and statistics, including regression and standard deviation. These functions were supplied through programs rather than dedicated function keys.