Image Credit:  Macworld, April 1993 Introduced: February 10, 1993 Terminated: October 21, 1993 Logic Board Processor:   68040 Processor Speed:   25 MHz The clock input runs at 50 MHz; however, the processor itself is clocked at 25 MHz, so technically it is only a 25 MHz processor. Processor Upgrade:   50 MHz with PPC 601 Upgrade Card PMMU:   Integrated FPU:   Integrated Bus Speed:   25 MHz Data Path:   32-bit ROM Size:   1 MB Level 1 Cache:   8K Level 2 Cache:   none Expansion Slots:   3 NuBus, 1 PDS Battery:   3.6V Lithium Note: Beginning March 14, 1994, Apple sold the Centris 650 with an optional PowerPC 601, 50 MHz Upgrade Card (Power Macintosh Upgrade Card). This configuration was discontinued on May 15, 1995. Memory RAM Type:   72-pin SIMM RAM Slots:   4 Min - Max RAM:   4 MB - 132 MB, 136 MB Minimum RAM Speed:   80 ns Install in groups of:   1 RAM Sizes:   4, 8, 16, 32 MB Onboard RAM:   4 MB or 8 MB Image Credit:  Macworld, April 1993 Ports ADB:   2 USB:   none FireWire:   none Video:   DB-15 Floppy:   none SCSI:   DB-25 Geoports:   none Ethernet:   opt. AAUI-15 Mic Type:   Omni Other ports:   Printer, modem, speaker (Macworld, June 1993) Centris 650 and Centris 610 Video Standard VRAM:   512K (Built-in) Maximum VRAM:   1 MB (2 x 256K) Display: 512 x 384, 16-bit (Built-in), 16-bit (2 x 256K) 640 x 480, 8-bit (Built-in), 16-bit (2 x 256K) 800 x 600, 8-bit (Built-in), 16-bit (2 x 256K) 832 x 624, 8-bit (Built-in), 16-bit (2 x 256K) 1024 x 768, 4-bit (Built-in), 8-bit (2 x 256K) 1152 x 870, 4-bit (Built-in), 8-bit (2 x 256K) Storage Standard CD-ROM:   2x Internal Hard Drive:   SCSI (80 - 500 MB) Floppy Disk Drive:   1.44 MB auto Operating System Addressing Modes:   24-bit or 32-bit Original OS:   7.1 Original Enabler:   PowerPC Upgrade Card Enabler (if used) AppleTalk Version:   58.0.2 Compatible MacOS: 7.5 7.1.2 7.5.1 7.5.3 7.5.5 7.6 7.6.1 8.0 8.1 8.5 (Requires PPC 601, 50 MHz Upgrade Card) For additional information on operating systems: See this article Miscellaneous Form Factor:   IIvx Dimensions (Inches):   6 H x 13 W x 16.5 D Average Weight (lbs):   25 Gestalt ID:   120 Original Price:   $2700, $3400, $3800 US Image Credit:   Macworld, February 1995 Image Credit:   Apple Inc. (Click) Apple Dealer Spec Sheets (Click) Additional Centris 650 Images: