See how a simple multiplication error sparks the design of a mechanical DIY calculator, beautifully handcrafted from wood and expertly engineered in metal by JLC3DP. Discover the process from CAD ...

As Andy Hertzfeld describes on folklore.org, early Apple employee Chris Espinoza drew a calculator for the Macintosh. He showed it to Steve Jobs. Jobs’s response? “Well,” he said, “it’s a start, but ...

After this ten-minute session, Espinosa completed the calculator’s interface using the settings Jobs had chosen. This design, decided upon in those ten minutes, was included with the first Macintosh, ...

Apple co-founder Steve Jobs was infamous for his harsh critiques of the work of his team. Hardware or software, if Steve wasn’t 100% happy, you would certainly know about it. Chris Espinosa, who wrote ...

In 1982, a young Mac developer turned Jobs into a UI designer—and accidentally invented a new technique.

In February 1982, Apple employee #8 Chris Espinosa faced a problem that would feel familiar to anyone who has ever had a micromanaging boss: Steve Jobs wouldn’t stop critiquing his calculator design ...