![]() įully-merged keystroke entry (210 program steps) The Spice series also featured the first business-oriented programmable machines, as well as HP's most sophisticated scientific calculator to date, the HP-34C. ![]() This led to numerous reliability complaints, so eventually HP returned to a more traditional design. Initially, the calculators' components were held together by pressure electronic components were not soldered onto the machines' flexible circuit boards. The third, and last, LED series of calculators from HP were plagued by a different problem. Trigonometrics, Exponentials, Continuous memory Trigonometrics, Exponentials, Continuous memory, Printerįully-merged keystroke entry (49 program steps) įully-merged keystroke entry (98 program steps) The design of the charging circuit also made it possible for the calculator to receive excessive voltage when a battery pack was not properly inserted, causing the calculator's sensitive MOS circuits to fail. Unfortunately, the construction of the calculators provided for the uneven heating of the batteries during charging, leading to premature battery wear. HP's second pocket product line featured several machines in a very small, pleasant form factor. Trigonometrics, Exponentials, Printer, Magnetic cards Trigonometrics, Exponentials, Linear regression, Continuous memory, Printer Trigonometrics, Exponentials, Magnetic cardsįully-merged keystroke entry (224 program steps)Ĭonditionals, Branching, Subroutines, Labels, Indirect addressingįully-merged keystroke entry (200 program steps) Partially merged keystroke (100 program steps)Ĭonditionals, Branching, Subroutines, Labels ![]() Trigonometrics, Exponentials, Real-time clock The appearance of the HP-67 places it in the Classic series, however. Strictly speaking, the HP-67/97/97S actually belong to the second generation: electronically, these machines use the technology of the "Woodstock" series. ![]() HP's first product line of pocket/portable calculators. Perhaps it's no wonder that the programming model changed little over the years its mature version, first introduced with the HP-67, remained largely the same over the years and was still used in HP's last series of RPN keystroke programmables, the Voyager series. In addition to all the programming advantages offered by the RPN system, it also offered conditional and unconditional branching, labels, subroutines, and a partially merged instruction set. The first pocket programmable calculator ever made, Hewlett-Packard's HP-65, already had a very sophisticated programming model. My first HP-65, for instance, has not yet had a single faulty read or write operation ever since I fixed its reader in the summer of 1999! The Keystroke Product Line ![]() HP magnetic card readers are a constant source of amazement for me: after their disintegrating transport wheels are repaired, they work like new even after 25 years. HP calculators are characterized by a very solid physical feel, robust design, great calculation accuracy, and reliable engineering solutions. HP is also one of the few survivors of the "calculator wars" of the 1970s, remaining one of the preeminent calculator manufacturers in 1999. HP can claim many of the firsts in this industry, including the first "shirt-pocket" scientific calculator (HP-35), the first pocket programmable calculator (the HP-65), the first pocket calculator with alphanumeric capability (the HP-41) and more. To most calculator owners, the name Hewlett-Packard is synonymous with the highest quality in handheld calculating devices. ![]()
0 Comments
Leave a Reply. |