introduced, only a few 7-inch NuBus cards existed; most were 12 inches. The smaller size was part of an upcoming update to the NuBus standard. System 7.1 was included as standard, with Mac OS 8.1 being the highest supported version. Versions with a full 68040 processor can also run A/UX with the appropriate Enablers. Models Introduced February 10, 1993: Macintosh Centris 610: Sold in four configurations: 68LC040, 4 MB RAM (onboard), 512 KB VRAM (onboard), 80 MB HDD, no Ethernet 68LC040, 8 MB RAM (4 MB onboard + 4 MB SIMM), 512 KB VRAM (onboard), 80 MB HDD, Ethernet 68LC040, 8 MB RAM (4 MB onboard + 4 MB SIMM), 512 KB VRAM (onboard), 230 MB HDD, Ethernet 68LC040, 8 MB RAM (4 MB onboard + 4 MB SIMM), 1 MB VRAM (512 KB onboard + 512 KB SIMM), 230 MB HDD, Ethernet, AppleCD 300i and microphone Introduced July 26, 1993: Workgroup Server 60: 68040 at 20 MHz, 8 MB ram (onboard), 250 or 500 MB HDD. The 500 MB model was sold for US$2,699 as of early 1994. Introduced October 21, 1993: Macintosh Quadra 610: 68LC040 or 68040 at 25 MHz, 160 or 230 MB HDD. Introduced February 28, 1994: Macintosh Quadra 610 DOS Compatible: 68040 at 25 MHz, 160 or 230 MB HDD; the DOS card occupies the PDS slot and includes an Intel 486SX-25 and has a 72-pin SIMM slot which supports up to 32 MB RAM. Timelines References External links Centris 610, Quadra 610 and Quadra 610 DOS compatible at Low End Mac Centris 610, Quadra 610, and Workgroup Server 60 at EveryMac.com 610 610 Quadra 610 Quadra 610 Quadra 610 Quadra 610 Computer-related introductions in 1993