iPhone app RPN-35 SD

On January 4, 1972, Hewlett-Packard announced the HP-35, worlds first scientific calculator small enough to fit in a pocket - more precisely, Bill Hewletts shirt-pocket.
The HP-35 was an immediate hit with students, engineers, and scientists.
Despite its steep price of $395 (more than $2,200 today), it sold ten times better than anticipated in the first year.

Experience this unique calculator that won HP the prestigious IEEE Milestone in Electrical Engineering and Computing in 2009.

Features:

Photo-realistic look-and-feel

Three skins: version 1, versions 2 & 3 (1973) and final version 4 (1974)

Vintage mode

Enhanced memory mode

Key-click and key-glow, both optional

Swipe left across display to correct wrong number entries

Cut/copy/paste display value

Display stack registers and all memory registers

All decimal points but one light when iPhone battery charge drops below 5%

Vintage mode

In this mode, peculiarities of a real HP-35 are simulated:

- original speed of operation

- stack register Z copied to T on trig functions

- leading zeros may be entered

- a negative number may be entered by pressing CHS before or after the number

- a keyboard entry or RCL immediately following STO does not raise the stack

- for version 1 only: a number of known arithmetic bugs

Enhanced memory mode

- non-volatile stack and registers

- use registers 1 through 9 with HP-45-like register arithmetic

- register 0 works as LastX register,

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