<P> Steve Jobs banned Easter eggs from Apple products upon his return to the company . </P> <P> The first Easter egg to appear after his death was in a 2012 update to the Mac App Store for OS X Mountain Lion, in which downloaded apps were temporarily timestamped as "January 24, 1984", the date of the sales launch of the original Macintosh . </P> <P> While computer - related Easter eggs are often found in software, occasionally they exist in hardware or firmware of certain devices . On some home computers the BIOS ROM contains Easter eggs . Notable examples include some errant 1993 AMI BIOS that on November 13, 1993, proceeded to play "Happy Birthday" via the PC speaker repeatedly instead of booting, as well as several early Apple Macintosh models that had pictures of the development team in the ROM . These Mac Easter eggs were well - publicized in the Macintosh press at the time along with the means to access them, and were later recovered by an NYC Resistor team, a hacker collective, through elaborate reverse engineering . Similarly, the Radio Shack Color Computer 3's ROM contains code which displays what looks like three Microware developers on a Ctrl + Alt + Reset keypress sequence--a hard reset which discards any information currently in RAM . </P> <P> Several oscilloscopes contain Easter eggs . One example is the HP 54600B, known to have a Tetris (1984) clone, and the HP 54622D contains an imitation of the Asteroids (1979) game named Rocks . Another is the Tektronix 1755A Vector and Waveform Monitor which displays swimming fish when Remote> Software version is selected on the CONFIG menu . </P>

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