Features Arithmetic Hewlett-Packard retained the numerical analyst William Kahan of UC Berkeley, the architect of the IEEE 754 standard for floating-point arithmetic, to design the numerical algorithms implemented by the calculators. He also wrote parts of the manuals. Programming The HP Voyager series calculator are keystroke programmable, meaning that it can remember and later execute sequences of keystrokes to solve particular problems of interest to the user. These keystroke programs, in addition to performing any operation normally available on the keyboard, can also make use of conditional and unconditional branching and looping instructions, allowing programs to perform repetitive operations and make decisions. The available programming features differentiate between the various HP Voyager series calculator systems. Legacy The HP-12C and its derivatives remains in widespread use today and is still available from Hewlett-Packard. The long-discontinued HP-15C was re-released in a "Limited Edition" in 2011 that has again been discontinued. Emulators Official emulators for the 12C and 15C are commercially available from Hewlett-Packard for Android and iOS devices. Clones In 2011, the continued popularity of the Voyager series among users prompted SwissMicros to produce a series of credit-card-sized calculators looking like miniature versions of their HP equivalents and running the original HP firmware in an emulator on a modern calculator hardware. The series consisted of the DM10, DM11, DM12, DM15 and DM16. All calculators used the same hardware, but differ in keyboard and firmware (which can be changed with an upgrade port). After the introduction of the larger DM15L, DM41L and DM16L in 2015, the DM11L was added in January 2016 with the DM12L following in February. A limited production run for a DM10L was planned for 2019. See also bulk CMOS semiconductor manufacturing process utilized for HP Nut processors References Further reading External links MyCalcDB: SwissMicros Manufacturer of HP calculator clones. Voyager series