Apple Macintosh Centris 650

[Vin66]

The Apple Macintosh Centris 650 was notable for introducing the powerful Motorola 68040 CPU to a midrange price point, offering much higher performance than the Macintosh LC series while being more affordable than the high-end Quadra line. It featured a higher-speed SCSI bus, accelerated internal video, interleaved memory for improved performance, and supported up to 136 MB of RAM, making it a strong multimedia and business machine of its era. Its claim to fame was helping to obsolete the older Macintosh IIci and Quadra 700, and it was among the first Macs to ship with a bootable CD-ROM drive, marking Apple’s transition toward multimedia computing.

Manufacturer: Apple Computer Inc.
Released: 1993
Type: Personal Desktop Computer
Cost at release: USD $2,499 (CAD ~$6,000 adjusted for inflation)
MIPS: 12.5

Hardware Specifications

CPU: Motorola 68040 or 68LC040, 25 MHz (full 68040 includes FPU; 68LC040 lacks FPU)
RAM: 4 MB or 8 MB onboard, expandable up to 132 or 136 MB using four 72-pin SIMM slots (80 ns)
ROM: 1 MB
Hard Drive: 80 MB, 230 MB, or 500 MB internal SCSI hard drive
Floppy Drive: 1.4 MB Apple SuperDrive
CD-ROM: Optional internal 5.25-inch CD-ROM drive
Video: 512 KB VRAM (expandable to 1 MB); supports resolutions up to 1152 x 870
Expansion Slots: 3 NuBus slots, 1 Processor Direct Slot (PDS)
Ports: 2 ADB, 2 serial (DIN-8), DB-25 SCSI, optional Ethernet (AAUI-15), printer, modem, audio in/out
Sound: Custom chip for stereo output, monaural input
Power Supply: 100–240 VAC, 50–60 Hz, 112 W max (excluding display)
Weight: 25 lbs (11.3 kg)

Operating System & Programming Languages

O/S: System 7.1 and officially supports System 7.1 through Mac OS 8.1. With a PowerPC upgrade, it can also run up to Mac OS 9.1 and Apple’s Unix variant A/UX
Programming Languages:
- Pascal: The standard language for classic Mac OS development, with Apple’s APIs and much of the OS itself written in Pascal.
- Object Pascal: Used for MacApp, Apple’s main application framework at the time.
- C and C++: Widely supported via development environments like Apple’s Macintosh Programmer’s Workshop (MPW) and Think C; C++ became more common as Apple transitioned to PowerPC.
- Assembly: For performance-critical and low-level programming.
- Other languages: Development tools for FORTRAN, BASIC, and HyperTalk (for HyperCard) were also available.

Notables

Short-lived naming experiment: The “Centris” name was chosen to indicate it was in the “center” of Apple’s product line, but Apple discontinued the entire Centris brand after only 9 months, earning it a “Road Apple” designation for poor marketing decisions.
The Macintosh Portrait Display was a unique and innovative monitor option compatible with the Centris 650, notable for its vertical (portrait) orientation and ability to display a full printed page at once, making it ideal for desktop publishing and professional layout work. Introduced in 1989, it featured a 15-inch grayscale CRT with a fixed resolution of 640 x 870 pixels, allowing users to view and edit full-page documents more naturally than on standard landscape monitors. While it was a niche product and not widely adopted by the general public, its design was influential in publishing and design circles
Identity crisis: Originally launched as the Centris 650 in February 1993, it was rebranded as the Quadra 650 in October 1993 with a speed bump from 25MHz to 33MHz, as Apple shifted to target-market naming (Quadra for business, LC for education, Performa for home).
CD-ROM pioneer: It was among the first Macs to ship with a bootable CD-ROM drive, alongside the Quadra 800, marking Apple’s transition toward multimedia computing.
Performance killer: The Centris 650 was so capable that it made the Quadra 700 obsolete—Apple dropped the 700 from their lineup when the Centris rolled out.
Clever hardware hack: The floppy drive mounting sled could be repurposed as a hard drive bay if users no longer needed the floppy drive.
Bargain basement legend: By the late 1990s, these once-$2,700 machines were selling for $150 or less on the used market, with one enthusiast famously scoring one for just $35 from an old professor.
Technical innovations: It introduced higher-speed SCSI bus, accelerated internal video, and interleaved memory for about 10% better performance to the Macintosh line.

Donated by: Dr. Arlen Michaels

Vintage Computing Collection