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Macintosh Centris 660av

Information about my old Macintosh 68040 Computer


In the early 1990s, I purchased a refurbished Centris 660av computer from a store in New Hampshire. I originally intended to buy a refurbished Quadra 610, but they were out of stock. The salesperson recommended the Centris 660av instead, as it was similarly priced and slightly better due to its AV capabilities.

Centris 660av Computer

When I moved to California in 1996, I brought the computer with me. I used it frequently until I bought the 8600/200 a few years later. I used the Centris 660av to encode many of the Real Audio files found on this site. Additionally, I used it as my answering machine and to digitize my voicemail.

Today, the computer sits unused in my home office. I need to find a monitor that works with it, as I currently don't have a VGA monitor. Perhaps I'll find one on Craigslist or somewhere similar.

This is the last pre-PowerPC computer that I would ever buy. This is also the only computer that I currently have that still runs System 7 - so I do want to boot it up some day to take a look back at the classic Macintosh.

I don't know if the hard drive works, but I did back everything to a CD.

Computer Specifications

  • CPU: 25MHz 68040 CPU
  • DSP: 55MHz 3210
  • ROM: 2MB
  • RAM: 8MB, expandable to 68MB using 70ns 72-pin SIMMs; motherboard has 2 SIMM slots which can be filled independently
  • VRAM: 1MB
  • L2 cache: optional
  • ADB ports for keyboard and mouse
  • DIN-8 serial ports on back of computer
  • DB-25 SCSI connector on back of computer


  • Motorola 68040, running at 25 MHz
  • Integrated floating-point unit, Page Memory Management Unit (PMMU), and 8KB cache

Digital signal processor

  • AT&T 3210, running at 55 MHz


  • Comes with 8MB of RAM
  • Can be expanded to up to 68MB of RAM with 32MB SIMMs (dealer installation required)

Disk drives

  • One built-in Apple SuperDrive 1.4MB floppy disk drive that uses high-density floppy disks and reads, writes, and formats Macintosh, MS-DOS, OS/2, and ProDOS disks
  • One internal hard disk (80MB, 230MB, and 500MB options available)
  • Optional internal Apple CD-ROM drive
  • Optional external SCSI hard disk drive (many capacities available)

Displays supported

  • All Apple displays up to 21 in.
  • A wide range of third-party displays, including NTSC, PAL, VGA, and SVGA monitors Video RAM (VRAM)
  • 1MB standard

Color depth support

  • 16-bit; permits display of thousands of colors on monitors up to 16 in., and up to 256 colors on 21 in.


  • One internal NuBus expansion slot via NuBus adapter, which includes support for digital audio video (DAV) connector
  • One Apple Desktop Bus (ADB) port, supporting a keyboard, mouse, and other devices
  • AAUI-15 Ethernet connector
  • Two serial (RS-232/RS-422) ports
  • Two S-Video and two composite video ports, one each for input and output
  • SCSI interface for connecting up to a total of seven SCSI devices
  • Sound-out port for stereo playback from CDs or Macintosh audio applications
  • Stereo sound-input port (supports 16-bit stereo audio)


  • Built-in Ethernet
  • Serial port for AppleTalk
  • Integrated GeoPort telecommunications architecture for data, fax, and voice connectivity

Sound generator

  • DSP-based 16-bit stereo audio
  • Sample rates: 8 kHz to 48 kHz

Keyboard and mouse

  • Several Apple Desktop Bus keyboards with numeric keypads available
  • Apple Desktop Bus Mouse II


  • Custom integrated circuit with long-life lithium battery

Electrical requirements

  • Line voltage: 100 to 240 VAC, RMS single phase, automatically configured
  • Frequency: 47 to 63Hz, single phase
  • Power: 86 W maximum, not including monitor power

ADB power requirements

  • Maximum current draw for all Apple Desktop Bus devices: 500mA (a maximum of three Apple Desktop Bus devices is recommended)
  • Mouse draws 10mA
  • Keyboard draws 25-80mA (varies with keyboard model used)

Size and weight

  • Height: 3.4 in. (8.5 cm)
  • Width: 16.3 in. (41.5 cm)
  • Depth: 15.6 in. (39.7 cm)
  • Weight: 14.0 lbs (6.4 kg) (Weight varies based on internal devices installed)

Operating environment

  • Operating temperature: 50? to 104? F (10? to 40? C)
  • Storage temperature: -40? to 116.6? F (-40? to 47? C)
  • Relative humidity: 5% to 95%, noncondensing
  • Maximum altitude: 10,000 ft. (3,048 m)



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