Macintosh Quadra 900

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Macintosh Quadra 900
Apple Macintosh Quadra 900.jpg
A Macintosh Quadra 900
Also known as "Darwin", "IIex"[1]
Developer Apple Computer, Inc.
Product family Macintosh Quadra
Release date October 21, 1991 (1991-10-21)
Introductory price US$7,200 (equivalent to $12,660 in 2016)
Discontinued May 18, 1992 (1992-05-18)
Operating system System 7.0.1Mac OS 8.1
CPU Motorola 68040 @ 25 MHz
Memory 4 MB, expandable to 256 MB (80 ns 30-pin SIMM)
Dimensions Height: 18.6 inches (47 cm)
Width: 8.9 inches (23 cm)Depth: 20.6 inches (52 cm)
Weight 36.8 pounds (16.7 kg)
Predecessor Macintosh IIfx
Successor Macintosh Quadra 950
Related articles Macintosh Quadra 700

The Macintosh Quadra 900 is a personal computer designed, manufactured, and sold by Apple Computer, Inc. from October 1991 to May 1992. It was introduced alongside the Quadra 700 as the first computers in the Quadra family of Macintosh computers using the Motorola 68040 processor.[2] It is also the first computer from Apple to be housed in an 18.6 inch (47 cm) tall mid-tower form factor, which by 1991 had gained momentum with PC manufacturers as a suitable design for departmental servers.

The Quadra 900 had a short lifespan; it was discontinued about six months after first shipments in favor of the more powerful Quadra 950.


The Quadra 900 was more expandable than the Quadra 700 but cost US$7,200.[2] The Quadra 900 could be upgraded to 256 megabytes of RAM,[3] an astronomical amount for the time, when a typical midrange system would come equipped with 2–4 MB. The standard, as-shipped configuration for the 900 was 4 MB. The high RAM and storage capacity, along with the expandability of five NuBus 90 slots and fast 25 MHz processor, made it a very useful computer for scientific or design work. The mid-tower case design features a single 5.25-inch drive bay initially intended to hold a tape backup drive, but was often repurposed to hold a CD-ROM or SyQuest drive during the machines' operational lifespan. Quadra 900s with full complements of RAM were exceedingly rare with 16–30-pin SIMM RAM slots, due to the high cost (many thousands of dollars) of the SIMMs at the time.

A new three-mode key-lock system on the front panel can be set to Off, On, and Secure. When set to Off, the machine can't be powered up. In Secure mode, the floppy drive and ADB port are disabled, offering a degree of local protection.[1]

System 7.0.1 was included and supports up to Mac OS 8.1. It is the earliest Macintosh model able to run Mac OS 8.

With the Power Macintosh Upgrade Card installed, the Quadra 900 runs at 50 MHz and its name is reported in the System Profiler as the Power Macintosh 900.[4]

Timeline of Macintosh Quadra and Centris models

Power Macintosh Macintosh LC III Macintosh II series Macintosh Quadra 630 Macintosh Quadra 950 Macintosh Quadra 650 Macintosh Quadra 610 Macintosh Quadra 900 Macintosh Quadra 840AV Macintosh Quadra 800 Macintosh Quadra 700 Macintosh Quadra 660AV Macintosh Quadra 650 Macintosh Quadra 610 Macintosh Quadra 605 Macintosh IIvx


  1. ^ a b Pogue, David; Schorr, Joseph (1999). "Chapter 12: From 128K to Quadra: Mac to Mac". MacWorld Mac Secrets, 5th Edition. IDG Books. pp. 483–484. ISBN 0-7645-4040-8. 
  2. ^ a b Webster, Bruce (December 1991). "Macintosh Quadras - Power But No Pizzas". MacWorld. pp. 140–147. 
  3. ^ "Macintosh Quadra 900: Technical Specifications". Apple. 
  4. ^ "Quadra 900: Technical Specifications". Apple. 

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