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Type: Journal Article
Author(s): Robert E. Burgan; Ronald A. Susott
Publication Date: 1986

If your Texas Instruments TI-59 is nearing its last gasp, you can replace it with a newer calculator and enjoy the use of improved fire danger and fire behavior programs. The Hewlett-Packard HP-71B handheld calculator has been selected to replace the TI-59 and is now available on a USDA Forest Service contract. The HP-71 B has several features that make it attractive as a field calculator: 1) An alphanumeric display that eliminates the need for keyboard overlays. 2) A liquid crystal display (LCD) that becomes easier to read in daylight, rather than more difficult. 3) Use of complementary metal oxide semiconductor (CMOS) technology, which has a very low power requirement, thus permitting 2 to 3 months of normal use between battery changes. 4) Field-replaceable AAA batteries, rather than rechargeable nickelcadmium batteries. 5) A continuous memory that retains the information stored in the calculator even when it is turned off. 6) A computational speed about six times faster than the TI-59. 7) A capability to be used with optional battery-operated printers, data cassettes, and disk drives. 8) A powerful BASIC programming language that is available for many other applications. 9) Output that can be routed to a battery-operated, field-portable Hewlett-Packard inkjet printer.

Citation: Burgan, Robert E.; Susott, Ronald A. 1986. HP-71 replaces TI-59 for fire calculations in the field. Fire Management Notes 47(2):11-13.

Cataloging Information

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Partner Sites:
  • fire behavior computations
  • NFDRS - National Fire Danger Rating System
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Record Maintained By: FRAMES Staff (
FRAMES Record Number: 8180