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Apple Macintosh Quadra

The Macintosh Quadra series was Apple Computer's product family of professional high-end Apple Macintosh personal computers built using the Motorola 68040 CPU. The first two models in the Quadra line were introduced in 1991, and the name was used until the Power Mac was introduced in 1994. The product manager for the Quadra family was Frank Casanova who was also the Product Manager for the Macintosh IIfx. The first models were the Quadra 700 and Quadra 900, both introduced in 1991. The Quadra replaced the Macintosh II series as the high end computer in the Macintosh product line.

The first computers to be part of the Macintosh Quadra series were the Quadra 700 and Quadra 900, both introduced in 1991 with a Central processing unit (CPU) speed of 25 MHz. The 700 was a compact model using the same case dimensions as the Macintosh IIci, with a Processor Direct Slot (PDS) expansion slot, while the latter was a newly designed tower case with five NuBus expansion slots and one PDS slot. The 900 was replaced in 1992 with the Quadra 950, with a CPU speed of 33 MHz. The line was joined by a number of "800-series" machines in a new minitower case design, starting with the Quadra 800, and the "600-series" pizza box desktop cases with the Quadra 610.

In 1993 the Quadra AV series was released, consisting of the 800-series Quadra 840AV and the 600-series Quadra 660AV, at 40 MHz and 25 MHz respectively. Both included an AT&T Digital signal processor and S-Video and composite video input and output ports for video, as well as CD-quality microphone and audio output ports. The AV models also introduced PlainTalk, consisting of the text-to-speech software MacinTalk Pro and speech control (although not dictation). However all of these features were poorly supported in software, and DSP was not installed in later AV Macs.

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