|HP codename, series||Superstar, Classic|
|Type, Precision, Input Mode||Scientific, 10 BCD digits, exponent ±99, Reverse Polish Notation|
|Programmable||100 commands, partially merged. One level of subroutines. Two user-flags. Labelled programs (A..E) accessible thru top function keys. Labels 0..9. Instruction inserting and deletion supported. No backstepping thru programs! Branching only to labels.|
|Memory||No permanent memory but magnetic cards. 10 registers (0..9)|
|Display||13 digit 7 segment red LED plus sign|
|Special features||Magnetic card reader. A very early programmable
Warning: Card reader only works with battery pack even when using the power supply (which cannot supply enough current).
|Original Pricing, Production||19.1.1974 ($795) - 3.1.1977 ($795)
DM 2600 in 1976 (according to Kurt Pribil).
|Batteries||3x AA pack or AC power supply|
|Dimensions||Length 15.1cm, Width 8cm, Height 3.6cm|
Owner's Handbook, July 1974 (PDF)
HP-65 Bedienungs-Handbuch, September 1974 (PDF, German)
HP-65 Kurzanleitung (PDF, German)
HP Journal, Programming the Personal Computer, May 1974 (PDF)
Quick Reference (PDF)
|Comment||HP's fourth calculator and first programmable
what a device! The built-in magnetic card reader allowed countless
software packages to be developed. Also, the card reader makes the
quite heavy and thus even more impressive.
Three prefix keys allow for an surprising number of directly accessible functions - while thanks to the clever usage of the f and f-1 key the keyboard doesn't look cluttered!
The programming model is good but has some serious shortcomings like missing backstepping and only one level of subroutine calls. These issues were overcome in the HP-67 which I suppose was much more popular.
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