16 Facts About Apple II


Apple II is an 8-bit home computer and one of the world's first highly successful mass-produced microcomputer products.

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The earliest Apple II computers were assembled in Silicon Valley and later in Texas; printed circuit boards were manufactured in Ireland and Singapore.

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Apple II used peculiar engineering shortcuts to save hardware and reduce costs, such as:.

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Apple II added vent holes to the case within three months of production; customers with the original case could have them replaced at no charge.

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Apple II's printed circuit board underwent several revisions, as Steve Wozniak made modifications to it.

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The early Apple II+ models retained this feature, but after a drop in DRAM prices, Apple redesigned the circuit boards without the jumpers, so that only 16kx1 chips were supported.

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Unlike most machines, all integrated circuits on the Apple II PCB were socketed; although this cost more to manufacture and created the possibility of loose chips causing a system malfunction, it was considered preferable to make servicing and replacement of bad chips easier.

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Color on the Apple II series uses a quirk of the NTSC television signal standard, which made color display relatively easy and inexpensive to implement.

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Rather than a dedicated sound-synthesis chip, the Apple II has a toggle circuit that can only emit a click through a built-in speaker or a line-out jack; all other sounds are generated entirely by software that clicked the speaker at just the right times.

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An Apple II manual signed by Steve Jobs in 1980 with the inscription "Julian, your generation is the first to grow up with computers.

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Original Apple II provided an operating system in ROM along with a BASIC variant called Integer BASIC.

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Apple II DOS was superseded by ProDOS, which supported a hierarchical filesystem and larger storage devices.

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Some commercial Apple II software booted directly and did not use standard DOS disk formats.

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Jesse Adams Stein wrote, "As the first company to release a 'consumer appliance' micro-computer, Apple II Computer offers us a clear view of this shift from a machine to an appliance.

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The magazine published a favorable review of the computer in March 1978, concluding: "For the user that wants color graphics, the Apple II is the only practical choice available in the 'appliance' computer class.

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The author concluded that "the Apple II is a very promising machine" which "would be even more of a temptation were its price slightly lower.

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