Quadra 610 DOS Compatible

Take the fairly popular 25 MHz Quadra 610, add a 25 MHz 80486SX-based IBM-compatibility card, and you have the Quadra 610 DOS Compatible.

Quadra 610Apple introduced this model to see if there was sufficient demand for a Mac with a DOS card. Production of 25,000 units was quickly snapped up by the enthusiastic marketplace, and several other DOS compatible Macs followed over the years, starting with the 630 DOS Compatible in May 1995.


  • introduced 1994.02; 1995.05.14
  • requires System 7.1 or later; highest version supported without a PPC upgrade is Mac OS 8.1.
  • CPU: 25 MHz 68040 CPU; 25 MHz 80486SX
  • performance: 12.1 (relative to SE)
  • ROM: 1 MB
  • RAM: 4 MB on motherboard, expandable to 68 MB using 80ns 72-pin SIMMs; motherboard has 2 SIMM slots, which can be filled independently; can use 4 MB, 8 MB, 16 MB, and 32 MB SIMMs. If SIMMs are not the same speed, faster SIMM should be in bank 0 (frontmost slot).
  • DOS card has 72-pin SIMM slot for dedicated RAM
  • video: 512 KB VRAM, expandable to 1 MB
    • 512 x 384 @ 16-bit
    • 640 x 480, 800 x 600, 832 x 624: 8-bit @ 512 KB, 16-bit @ 1 MB
    • 832 x 624, 1024 x 768, 1152 x 870: 4-bit @ 512 KB, 8-bit @ 1 MB
  • L2 cache: none
  • 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
  • one PDS slot (occupied by DOS card)
  • size (HxWxD): 3.4″ x 16.3″ x 15.6″
  • weight: 14 lb.
  • PRAM battery: 3.6V half-AA
  • Gestalt ID: 53
  • addressing: 24-bit or 32-bit
  • upgrade path: Power Mac PDS card, Power Mac 6100 logic board (requires some case modification)

Accelerators & Upgrades

Online Resources


  • You must have a “fat” system installed to use a PowerPC upgrade.
  • If you have a non-Apple hard drive formatted with Silverlining, read this warning.
  • This case has poor air circulation, which can cause replacement hard drives or accelerators to overheat. If this happens, the first thing to try is removing the small horizontal insert on the back. If this fails, look into replacing the fan in the power supply (contact Newark Electronics at 1-800-463-9275 for information on their 25cfm fan) or moving the hard drive to the CD-ROM bay (assuming you don’t have a CD-ROM player).
  • Serial port normally restricted to 57.6 kbps; throughput with a 56k modem may be limited. See 56k modem page. For more information on Mac serial ports, read Macintosh Serial Throughput on the Online Tech Journal.

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