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Macintosh Quadra 840AV
Also known as"Quadra 1000", "Cyclone"
DeveloperApple Computer
Product familyMacintosh Quadra
Release dateJuly 29, 1993; 30 years ago (1993-07-29)
Introductory priceUS$3,500 (equivalent to $7,400 in 2023)
DiscontinuedJuly 18, 1994 (1994-07-18)
Operating systemSystem 7.1 - Mac OS 8.1
CPUMotorola 68040 @ 40 MHz
MemoryMB, expandable to 128 MB (60 ns 72-pin SIMM)
DimensionsHeight: 14 inches (36 cm)
Width: 7.7 inches (20 cm)
Depth: 15.75 inches (40.0 cm)
Mass25.3 pounds (11.5 kg)
PredecessorMacintosh Quadra 800
SuccessorPower Macintosh 7100/66AV
Power Macintosh 8100/80AV
RelatedMacintosh Quadra 660AV

The Macintosh Quadra 840AV is a personal computer designed, manufactured, and sold by Apple Computer from July 1993 to July 1994. It was introduced alongside the Centris 660AV, where "AV" signifies audiovisual capabilities, such as video input and output, telecommunications, speech recognition, and enhanced audio. The 840AV has the same mini-tower form factor as the Quadra 800, with a faster Motorola 68040 processor.

The Quadra 840AV was discontinued shortly after the introduction of the PowerPC-based Power Macintosh. The Power Macintosh 8100/80AV provides the same functionality in the same form factor, and had a significantly higher price point. The 7100/66AV was priced comparably to the 840AV but in a IIvx-style desktop case.


The Macintosh Quadra 840AV with a 16" Macintosh Color Display (M1298), AppleDesign Powered Speakers (M6082), an Apple Extended Keyboard II (M3501) and an Apple Desktop Bus Mouse II (M2706)
Macintosh Quadra 840AV logic board

At launch, Quadra 840AV's 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. It remains both the fastest Quadra and the fastest 68k Macintosh of all time, because all later high-end Macintoshes are PowerPC-based Power Macintoshes. The 840AV is the only Mac to use the 40 MHz-clocked 68040. It sports a faster 66.7 MHz AT&T DSP 3210 Digital Signal Processor chip, compared with the 55 MHz variant in the 660AV. The on-board DSP was primarily intended to speed up audio/video processing, although few Mac programs make use of this due to the complexity of programming it.

The 840AV and its relative, the Centris/Quadra 660AV, marked a number of firsts for the Macintosh family. They are the first Macintoshes to include on-board 16-bit 48 kHz stereo audio playback and recording capability, and S-Video and composite video input and output. To improve video playback, two separate frame buffers are used: one for standard graphics, and one specifically for video. This enables the live video input to be displayed as a scalable "window" within the Macintosh user interface. They are also the first personal computers that supported speech recognition (PlainTalk) out-of-the-box. The Apple GeoPort Telecom Adapter Kit introduced with the AV Macs add many DSP-based telecommunication functions, such as modem, fax, and telephony.

The Quadra 840AV has a similar case to the earlier Macintosh Quadra 800; the housing, chassis, power supply, and internal storage assemblies are the same, but the front and rear panels changed, with the power button being moved to the front.[1]

Internally, the 840AV is significantly different. Apart from the faster processor, the logic board lacks the 800's Processor Direct Slot and second ADB port, but has a DAV slot (in line with NuBus slot A) and the new GeoPort. Also, unlike the 800's 8 MB of fixed RAM, all of the 840AV's memory is in SIMMs (this is the reason why the maximum amount of memory is lower).

The way in which the 840AV deals with its memory (DRAM) differs from the other machines of its generation (Quadra 700, 800, 950) in that 4, 8, 16, or 32 MB 72-pin 60ns SIMMs may be installed up to 128 MB and sizes can be mixed. However, the Quadra 840AV does not support 1 MB, 2 MB, or 64 MB SIMMs. The 840AV and 660AV are the first Macintosh computers to operate in 32-bit mode at all times, and cannot be toggled back to 24-bit mode, which may be useful for using early Nubus cards that conform to the 24-bit addressing.[2]

Notable uses

The Quadra 840AV was part of a hardware package that was offered with the initial release of Media 100.


Jonathan Chevreau of the National Post said on August 7, 1993 that the Quadra 840AV and Centris 660AV were the next most interesting multimedia computers behind the new SGI Indy, putting Apple among the forefront of the birth of the major industry of desktop multimedia.[3]

Ben Thompson of Byte magazine said in September 1993 that Apple and Silicon Graphics were trailblazers by setting audio and video input as default features of those two Macintosh and of the Indy desktop PCs, which "could change the way businesspeople communicate".[4] He said the new AV Macs had a surprising leap in features, breaking Apple's trend of slow but stable incremental technology refreshes. He tested the 840AV as the overall fastest Macintosh, attributing this to its "radically" new AV series hardware features such as dedicated DMA channels for SCSI, serial, ethernet, and sound—but noted that the SCSI DMA performance is completely lost on the legacy architecture of System 7 pending a complete microkernel-based rewrite of the operating system such as with Pink or Copland. He tested the wealth of AV features such as telecommunications, print-to-fax, speech recognition, and video capture, and appreciated their productivity gains with surprisingly no compatibility problems.[5]


Timeline of Macintosh Centris, LC, Performa, and Quadra models, colored by CPU type
Macintosh Performa 6214Macintosh Performa 6210Macintosh Performa 6205Macintosh Performa 6230Macintosh Performa 6220Macintosh Quadra 840AVMacintosh Quadra 650Macintosh Quadra 610Macintosh Quadra 605Macintosh Quadra 660AVMacintosh Quadra 800Macintosh Centris 650Macintosh Centris 610Macintosh Quadra 950Macintosh Quadra 630Macintosh Quadra 900Macintosh Quadra 700Macintosh Performa 6420Macintosh Performa 6410Macintosh Performa 5440Macintosh Performa 5430Macintosh Performa 5280Macintosh Performa 6360Macintosh Performa 5260Macintosh Performa 6400Macintosh Performa 6400Macintosh Performa 5400Macintosh Performa 5400Macintosh Performa 6260Macintosh Performa 5400Macintosh Performa 5420Macintosh Performa 5410Macintosh Performa 5270Macintosh Performa 5260Macintosh Performa 6320Macintosh Performa 6310Macintosh Performa 6300Macintosh Performa 6290Macintosh Performa 5320Macintosh Performa 5300Macintosh Performa 6218Macintosh Performa 6216Macintosh Performa 6200Macintosh Performa 6116Macintosh Performa 5220Macintosh Performa 5215Macintosh Performa 5210Macintosh Performa 5200Macintosh Performa 640CDMacintosh Performa 580CDMacintosh Performa 588CDMacintosh Performa 638Macintosh Performa 637Macintosh Performa 636Macintosh Performa 635Macintosh Performa 631Macintosh Performa 630Macintosh Performa 578Macintosh Performa 577Macintosh Performa 575Macintosh Performa 476Macintosh Performa 475Macintosh Performa 560Macintosh Performa 550Macintosh Performa 275Macintosh Performa 6118Macintosh Performa 6117Macintosh Performa 6115Macintosh Performa 6112Macintosh Performa 6110Macintosh Performa 467Macintosh Performa 466Macintosh Performa 460Macintosh Performa 410Macintosh Performa 520Macintosh Performa 450Macintosh Performa 430Macintosh Performa 405Macintosh Performa 250Macintosh Performa 600Macintosh Performa 400Macintosh Performa 200Power Macintosh 5300 LCMacintosh LC 575Macintosh TVMacintosh LC IIIMacintosh LC 550Macintosh LC 580Macintosh LC 520Macintosh LC 630Macintosh LC 475Power Macintosh 5200 LCMacintosh LC IIIMacintosh LC IIMacintosh LC


  1. ^ "Apple Service Source - Macintosh Quadra 840AV" (PDF). Apple.
  2. ^ "Apple Memory Guide, November 2000, page 5" (PDF).
  3. ^ Chevreau, Jonathan (August 7, 1993). "The multimedia frontier". National Post. Toronto. Retrieved March 5, 2021 – via
  4. ^ Thompson, Tom; Smith, Ben (September 1993). "Apple, SGI blaze video trail". Byte. Vol. 18, no. 10. MultiMedia Healthcare Inc. pp. 81–82. ISSN 0360-5280. ProQuest 217797442. Retrieved March 5, 2021 – via ProQuest.
  5. ^ Thompson, Tom (January 1994). "The Mac Quadra 840AV packages more speed with new video and voice technologies". Byte. Archived from the original on June 19, 2008. Retrieved March 6, 2021.