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The Quadra 840av is powered by a 40MHz [[Motorola 68040]] making it the fastest Macintosh of the 68K era.
 
The Quadra 840av is powered by a 40MHz [[Motorola 68040]] making it the fastest Macintosh of the 68K era.
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The Macintosh Quadra 840AV combines the raw horsepower of a
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40-megahertz 68040 microprocessor with a 66-megahertz digital signal
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processor (DSP) to achieve outstanding performance. The DSP handles
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telecommunications, speech, and audio functions, allowing the 68040
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processor to perform other tasks, thereby increasing the total system
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performance.
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The exceptional power and built-in features of the Macintosh Quadra
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840AV let you take full advantage of exciting new audio-visual
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technologies. For example, with its built-in GeoPort
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telecommunications architecture, the Macintosh Quadra 840AV can be
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connected with telephone systems, so you can use your computer as a
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telephone, an answering machine, a fax machine, and an electronic mail
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station. Its video capabilities let you view or capture video from a
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VCR, laser disc, or camcorder in a window. You can also connect
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directly to a TV to show your presentations or to a VCR to make
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videotapes.
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=General Information=
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The Quadra 840av was the first 68040 Mac to break the 33 MHz barrier. Based on the 40MHz 68040 processor, and housed in a Quadra 800-style case, the 840av included AV features similar to its younger sibling, the [[Macintosh Quadra 660av]]. However, it's AT&T 3210 DSP ran at a faster 66 MHz. It also included one Geoport, and sold for $3,550, which was inexpensive for what was, at the time, the fastest Mac ever. Introduced in July 1993 and discontinued in July 1994.
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Codenames: Quadra 1000, Cyclone. Originally shipped with [[System 7.1]] and system enabler 088 v1.0.
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===CPU===
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Motorola 68040, 32-bit architecture, 40 Mhz clock speed. Integrated floating-point unit. Paged Memory Management Unit (PMMU). 8 KB Cache.
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===Memory===
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RAM consists of dynamic random-access memory (DRAM) on 72-pin Single Inline Memory Modules (SIMMs). Each SIMM contains one or two banks of DRAM with up to 16 MB of capacity per bank. The DRAM in the Macintosh Quadra 840AV must have an access time of not more than 60 ns.
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===Video===
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The Macintosh Quadra 840AV lets the user expand VRAM capacity by inserting 68-pin SIMM cards in its two VRAM expansion slots.
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===DSP===
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The Macintosh Quadra 840AV and Macintosh Centris 660AV computers include an AT&T DSP3210 32-bit floating-point digital signal processor (DSP). The DSP gives these computers the ability to perform fast, complex real-time data processing tasks, such as speech recognition, audio compression, analog modem signal processing, and so on. In the Macintosh Quadra 840AV, the DSP runs at 66.6667 MHz; in the Macintosh Centris 660AV, it runs at 55.5000 MHz. The DSP chip contains its own 8 KB of internal RAM, which minimizes its use of system memory.
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===Physical Dimensions===
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Height 14.25 inches (30.6 cm), Width 7.75 inches (19.7 cm), Depth  16.0 inches (39.6 cm), Weight 24 pounds (10.9 kg). Weight varies based on installed components.
    
=Notes=
 
=Notes=
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File:Quadra840CarteMere.jpg
 
File:Quadra840CarteMere.jpg
 
</gallery>
 
</gallery>
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=Documentation=
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* [[Macintosh Quadra 840AV Service Source]]
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* [[Macintosh Quadra 840AV and Centris 660AV Developer Note]]
    
=See Also=
 
=See Also=
 
* [[Apple Computer]]
 
* [[Apple Computer]]
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{| class="wikitable" style="background-color:#cbcefb;"
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|+The Macintosh Quadra Series from [[Apple Computer]]
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|-
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|[[Macintosh Quadra 605]] -- [[Macintosh Quadra 610]] -- [[Macintosh Quadra 630]] -- [[Macintosh Quadra 650]] -- [[Macintosh Quadra 660av]] -- [[Macintosh Quadra 700]] -- [[Macintosh Quadra 800]] -- [[Macintosh Quadra 840av]] -- [[Macintosh Quadra 900]] -- [[Macintosh Quadra 950]]
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|}
    
[[Category:Apple]]
 
[[Category:Apple]]
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[[Category:68040]]
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[[Category:1993]]

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