![]() ![]() ![]() Then the first HP-35s for general sale were made, still nearly the same, but with the unit number stamped in 3mm high digits. Of nearly identical HP-35s was made for a customer company who placed an order for them. The serial number is printed on the back, between the two lower rubber feet, it is 1143A followed by the unit number stamped into the label in letters 1mm high. They have an (hp) logo printed inside the battery compartment. The first batches were made for use inside HP only. The "5" key had a raised dot on it so it could be found by touch. This was soon removed - you could see the HP-35 was on anyway, because theĭisplay lit up! Even if the batteries were low, you could see the switch was at the side marked ON. When the HP-35 was turned on, a red spot showed through this hole. ![]() The earliest production HP-35 units had a small hole to the right of the on/off switch. Early publicity photographs show an HP-35 prototype, like theįirst production model shown on this guide's cover, but with the lettering on all the keys in black instead of white on some black was used later on these keys on the HP-80 and the HP-45. The other is reputed to have had gold trimmings - only a prototype case was made. Two basic styles of prototype were designed - the simpler one was chosen for production. Several changes were made in the HP-35 design during the time it was made. Transcendental functions, so I give more details of it than of other models. The HP-35 is of special interest to collectors because it was the first HP handheld, and the world's first handheld calculator with Then they decided to try selling it - and sold hundreds of thousands. At first, HP thought they would only make a few HP-35s for their own engineers, as no-one else would be Hewlett was shown the HP9100 desktop calculator by his engineers, and asked for a version to fit in his shirt-pocket. The story goes that it was made after William It does not have a shift key like later models, but there is an ARC key for use with SIN, COS, and TAN to give their inverses. As opposed to later HP calculators, it has an x y function, not y x,Īnd the trigonometric functions work in degrees only. In effect it was the world's first electronic slide rule. Introduced on February 1 1972, the Hewlett-Packard HP-35 was the first handheld electronic calculator sold by HP, and the first handheld ever to perform logarithmic and trigonometric functions with one AlsoĪvailable through good book stores and Amazon. From the book "A Guide to HP Handheld Calculators and Computers," by Wlodek Mier-Jedrzejowicz, Ph.D., available from Wilson/Barnett Publishing, P.O. ![]()
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