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The Macintosh was the first successful mass-market all-in-one desktop personal computer with a graphical user interface, built-in screen, and mouse. [33] It was first demonstrated by Steve Jobs in the first of his famous Mac keynote speeches, and though the Mac garnered an immediate, enthusiastic following, some labelled it a mere "toy". [34]
The Macintosh Plus was the last classic Mac to have an RJ11 port on the front of the unit for the keyboard, as well as the DE-9 connector for the mouse; models released after the Macintosh Plus would use ADB ports. The Mac Plus was the first Apple computer to utilize user-upgradable SIMM memory modules instead of single DIP DRAM chips. Four ...
Fans installed in a PC case can produce noise levels of up to 70 dB. Since fan noise increases with the fifth power of the fan rotation speed, [2] reducing revolutions per minute (RPM) by a small amount potentially means a large reduction in fan noise. This must be done cautiously, as excessive reduction in speed may cause components to ...
In addition, the internal structure of the first batch of units, described as "a disaster" by The Daily Telegraph, [23] used an aluminum enclosure inside the plastic case as the heat sink instead of a cooling fan, reputedly to meet Steve Jobs' demands for a silent computer and reduce RFI emissions, a severe problem affecting the Apple II. The ...
The type of bearing used in a fan can affect its performance and noise. Most computer fans use one of the following bearing types: Sleeve bearings use two surfaces lubricated with oil or grease as a friction contact. They often use porous sintered sleeves to be self-lubricating, requiring only infrequent maintenance or replacement.
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