Quadra 840av

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Using the same case as the Quadra 800, the 840av incorporates the same AV circuitry as the Centris 660av. Running a 40 MHz CPU, this was Apple’s fastest 68040-based computer ever.

Quadra 840avThe 840av also runs a faster version of the AT&T DSP chip, one clocked at 66 MHz v. 55 MHz in the 660av. This and the 660av were the only Quadras to use the GeoPort high speed serial port.

One popular use for the AV Quadras was adding text and graphics to videos.

This model’s only real drawback is the terrible case.

Tidbit: Hold down Cmd-Opt-T-V during startup to force this Mac to use a TV as a monitor.

Details

  • introduced 1993.07.29 at $4,700; discontinued 1994.07.18
  • requires System 7.1 (with System Enabler 088 v1.0) or later; highest version supported is Mac OS 8.1.
  • CPU: 40 MHz 68040
  • DSP: 67 MHz AT&T 3210
  • Performance: 16.5, relative to SE; 12.13, MacBench 2.0 CPU; 1.58, Speedometer 4; 35 MIPS
  • ROM: 2 MB
  • RAM: 4 MB, expandable to 128 MB using 60ns 72-pin SIMMs; motherboard has 4 SIMM slots which can be filled individually but should ideally be filled in interleaved pairs; can use 4 MB, 8 MB, 16 MB, and 32 MB SIMMs
  • video: 1 MB VRAM, expandable to 2 MB using four 256 KB 80ns VRAM SIMMs
    • 512 x 384, 640 x 400 @ 24-bit
    • 640 x 480, 800 x 600, 832 x 624: 16-bit @ 1 MB, 24-bit @ 2 MB
    • 1024 x 768, 1152 x 870: 8-bit @ 1 MB, 16-bit @ 2 MB
  • L2 cache: optional
  • ADB: 2 ports for keyboard and mouse
  • serial: 2 DIN-8 RS-422 ports on back of computer
  • SCSI: DB-25 connector on back of computer
  • Hard drive: 230 MB, 500 MB, or 1 GB
  • Ethernet: built in AUI-15 (AAUI) port, requires adapter
  • video I/O: S-video in and out; composite video in and out; supports input and output in NTSC, PAL, and SECAM formats
  • audio: 16-bit stereo input and output ports use mini phone-jack connectors, sample rate to 48 KHz
  • Hard drive: 230, 500, or 1000 MB
  • CD-ROM: 2x
  • NuBus: 3 NuBus 90 slots
  • PDS slot: none
  • size (HxWxD): 14.25″ x 7.75″ x 16″ (360 x 196 x 396 mm)
  • Weight: 24 lbs. (11.3 kg)
  • power supply: 200 W maximum output, 100-240 VAC input @ 50-60 Hz
  • PRAM battery: 3.6V half-AA
  • Gestalt ID: 78
  • addressing: 32-bit
  • upgrade path: Power Mac 8100, 8500

Accelerators & Upgrades

Online Resources

Cautions

  • Apple Computer considers this computer obsolete as of 2001.07.16 in the United States and 2001.07.23 in Canada. Service parts and documentation are no longer available from Apple.
  • The Startup Disk control panel in System 7.5-7.5.3 is incompatible with Quadra AVs. System 7.5.5 fixes this.
  • Quadra AVs do not support 24-bit addressing.
  • You must have a “fat” system installed to use a PowerPC upgrade.
  • Note that the 660av and 840av don’t do video mirroring, so if you’re doing output to TV or VCR, your computer monitor will be blank.

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