Atari Calculator - official programmable RPN calculator for Atari 800

[appsoft]

Full story of the Atari Calculator (1977-1982), the official Atari 800 calculator, programmed by Carol Shaw, now available on Wikipedia:

• Read the full story - https://en.wikipedia.org/wiki/Atari_Calculator
  

The first screenshot, published by Atari in 1979:
   
This version probably never released to the public, and there was no sales until November 1981.

The last screenshot, published by Atari in 1982:
   
This version was on sale since November 1981 (priced $29.95).

The source of the Collen Calculator (unreleased Atari Calculator successor ROM cartridge version), released by Carol Shaw in 2016:

• Source repo - https://github.com/savetz/ColleenCalculator
  

Note, that in the article on Wikipedia also highlighted ports and alternatives (unofficial Atari software), with links to related topics on this forum:

• ATARI 400/800 RPN Calculator Simulator (1981) by John Crane - https://www.hpmuseum.org/forum/thread-17144.html
• HP Calculator Emulators for the Commodore 64 and ATARI 800XL (2014) by Norbert Kehrer - https://www.hpmuseum.org/forum/thread-14301.html
  (Norbert Kehrer also ported the official Atari Calculator to Commodore 64)