Macintosh Quadra 840AV

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A Macintosh Quadra 840AV
Macintosh Quadra 840AV
Manufacturer Apple Computer
Introduced July 29, 1993
Discontinued July 18, 1994
Price US$3500
CPU Motorola 68040, 40 MHz
RAM 4 MB, expandable to 128 MB, 60 ns 72-pin SIMM
OS System 7.1

The Macintosh Quadra 840AV (Codenames: "Quadra 1000", "Cyclone") is a personal computer that is a part of Apple Computer's Quadra series of Macintosh computers. It was introduced in July 1993 alongside the Centris 660AV, the "AV" after both model numbers signifying video input and output capabilities. It was discontinued in July 1994, with no immediate replacement - however, the later AV versions of the Power Macintosh 8100 took a very similar position in Apple's product lineup.

At the time of introduction, its 40 MHz Motorola 68040 CPU and interleaved RAM made it the fastest Macintosh available, topping both the nominally higher-end Quadra 950 and the Quadra 800 by 7 MHz. That makes it both the fastest Quadra and the fastest 68k Macintosh of all time, since all later high-end Macintoshes were PowerPC-based Power Macintoshes. The 840AV is also the only Mac to use the 40 MHz clocked 68040. It also sports a 66 MHz AT&T DSP (Digital Signal Processor) chip which was primarily intended to speed up audio/video-processing, although few Mac programs made use of this due to the complexity of programming it.

The Quadra 840AV came in the same case as the earlier Macintosh Quadra 800, but was significantly different on the inside - apart from the faster processor, it lacked the 800's Processor Direct Slot, but added another Apple Desktop Bus port and the new GeoPort. Also, unlike the 800's 8 MB of fixed RAM on the logic board, all of the 840AV's memory was in SIMMs (this is the reason why the minimum amount of memory is lower).

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