Even as he grows older, Microsoft founder Bill Gates still fondly remembers the catalytic computer code he wrote 50 years ago that opened up a new frontier in technology.

However, the tech giant lacks its own proprietary silicon chips and relies on other companies to produce these essential AI model components. It remains to be seen whether Microsoft’s other AI investments will be enough to uphold its legacy for another 50 years — or if it will fall behind other AI companies.

On Wednesday, the Microsoft co-founder posted on his Gates Notes blog, reminiscing about the company's early days for its 50th anniversary this year. Gates has certainly written plenty of code over those five decades, but he called this "the coolest code I've ever written" and shared a photo of himself holding a huge pile of paper showing the code.