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Gordon Moore, cofounder of Intel, proposed Moore's Law which observes that the number of transistors in an integrated circuit doubles approximately every two years.

Windows 3.1 was released on April 6, 1992 as the successor to Windows 3.0. It provided a graphical user interface that ran on inexpensive ordinary PCs.

Hayes compatible modem refers to a de facto standard named after a defunct modem manufacturer. Many software programs advertise compatibility with Hayes modems or Hayes-compatible modems.

The Atari ST computer was introduced on April 8, 1985. It sold 50,000 units quickly after its release.

Osborne Computer Corporation, an early maker of CP/M computers and portable computing pioneer, liquidated on April 9, 1986 after three years of financial hardship. Its demise is generally attributed to its founder.

Intel announced the 486 CPU at Comdex on April 10, 1989. The chip was priced at $950 each when purchased in quantities of 1,000.

Cyrix introduced its 486SLC CPU on April 13, 1992. The company relied on other chipmakers like SGS Thomson and Texas Instruments to manufacture the processors since it lacked its own fabrication plants.

Google acquired DoubleClick for $3.1 billion in cash on April 13, 2007. This acquisition further expanded Google's advertising business, which had already included its AdWords product since 2000.

Intel introduced its first Celeron processor, the Celeron 266, on April 15, 1998. This marked the beginning of a product line that would last 25 years, though it was a cut-down version of the Pentium II processor.

The Apple II was announced on April 16, 1977 as one of the first pre-built desktop computers, though it didn't ship until June of that year. It went on to sell approximately 6 million units.

The final MP3 patent has expired, marking the end of the format's patent protection. This means MP3 technology is now freely available for use without licensing restrictions.