A similar calculator but more powerfull than the CASIO: 101 One of the features is it's simple method of setting a program for complex calculations whereby each operating function is given a code number and the calculating program is then entered, in numerical form, via the keyboard, which may be verified at any time. Info from CASIO Website: While expanding its sales routes, CASIO also promoted development of various new models. The AL1000, completed in 1967, was the world’s first programmable calculator with software. In early computers and high-performance calculators, programs were created by setting and recombining removable hardware parts. With the AL1000 however, calculation routine software could be easily programmed using a keyboard. This meant that troublesome rearrangement of parts was no longer necessary. By calling up the stored calculation routines, complex calculations such as scientific and technical computations could be easily performed. Not only that, the AL1000 was just as compact as a regular calculator of the time, even with its programming function, thanks to the compact storage component, called a magnetic core, used for the 14-digit operation register, storage register, and program storage device. At a price point of 328,000 yen, it was only about 30% more than a regular calculator, and it became a best seller in Japan, Europe and North America.