The Museum of HP Calculators

This Hewlett-Packard advertisement, originally published in Scientific American, is used by permission. If errors crept in during the scanning process, please contact Dave Hicks

The HP-81 helps you make business a little more of a science.

The plethora of calculators now on the market can baffle potential buyers with a confusing array of choices. Fortunately, HP continues to provide clear choices when it comes to calculators for science and engineering, and for the world of business and finance.

For the latter, the HP-80 is still the only pocket-sized computer calculator with 40 preprogrammed business functions. And now there's the new HP-81, which applies even more computation power to the business of evaluating the complex relationships between time and money.

The HP-81 is considerably more than a desk-top HP-80 with a printer. Its added capabilities include 63 preprogrammed functions for performing -- in a few seconds, and in a few keystrokes -- complex business problems that used to take up to 20 minutes to calculate manually. For example, with the HP-81 you can compute and print a 30-year mortgage table in 83 seconds, get a coupon equivalent yield in 21 seconds, or figure a discounted cash flow in 14 seconds. All without tables, calendars or formulas. They're all built in.

The HP-81 contains two 200-year internal calendars (360 and 365 days), 20 storage registers for saving dates or numbers for repetitive calculations (and for automatic multiplication or division by any constant you choose), and 10 special modes for bond and note calculations. Best of all, the HP-81's flexibility helps you explore alternate approaches to a problem. You can check variables using a different date or number, without re-entering the entire problem, and get fast assurance that you have come up with the best decision.

The time and money saved by one or two profitable decisions could easily repay the $925* purchase price. An LED display and high-speed buffered keyboard are optional. For more details on HP's newest time and money machine, send in the coupon.

*Domestic USA prices only.

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