Apple Macintosh Quadra 950

The Macintosh Quadra 950 was the third desktop computer in Apple Computer's Quadra line. It was based on Motorola's 68040 microprocessor rather than the 68LC040 (which lacked an on-board FPU). It replaced the Quadra 900, increasing the CPU clock rate from 25 MHz to 33 MHz, and improving the graphics support. The two computers were otherwise identical.

Processor: Motorola 68040
Processor Speed: 33 MHz
Processor Cache: 8 KiB L1
Processor Bus Speed: 33 MHz
Hard Drive: 230 MB - 1 GB
Media drives: 2x CD-ROM drive, 1.44 MB floppy drive, optional DDSDC drive
Software: Mac OS 7.1 - 8.1
Logicboard RAM: None
Maximum RAM: 256 MB
Type of RAM Slots 16 - 32 pin SIMM
Minimum RAM Speed: 80 ns
Interleaving Support: No
Display Connection: DB-15
Graphics Card: None
Graphics memory: 1 - 2 MB (four sockets)
Expansion Slots: 5 - NuBus, 1 - PDS
Hard Drive Bus: SCSI
Backup Battery: 3.6 V Lithium
Max Watts: 303 W
Ports: AAUI-15 Ethernet, DB-25, 2 Serial, 3.5-mm mono input jack, 3.5-mm stereo output jack
Introduction Date:  May 18, 1992 
Discontinued Date:  October 14, 1995 

According to Apple, the monstrous power supply can support two 25-watt NuBus cards and three of the more typical 15-watt cards.

The internal SCSI bus is terminated on the motherboard, so internal SCSI devices should not be terminated. This is the opposite of all other Macs except the Quadra 900. However, the external SCSI bus works the same as on other Macs.

Although there are two separate SCSI buses, System 7.0-7.1 "folds" them together so the operating system sees a single virtual SCSI bus. Thus, under System 7.0-7.11 (and only under those systems) you must make sure that all devices on both chains have unique IDs.
Our unit - Model No: M4300 with a SerialNumber of CK40206Z1AK was very kindly donated by  Andy Taylor of

Manufacturer: Apple
Date: 18th May 1992

Apple Macintosh Quadra 950 Manuals:

Item Manufacturer Date
IBM - Personal Computer Hardware Reference Library - Guide to Operations IBM March 0984

Apple Macintosh Quadra 950 Articles:

Item Manufacturer Date
Memories - Notes by a physicist who dabbled with computers - John Yates

Magazines RELATED to Apple Macintosh Quadra 950 in our Library

Item Manufacturer Date
Personal Computer World - September 1985 01-09-1985
Personal Computer World Special: Business Computing The 1986 Survival Guide April 1986
Byte November 1992 November 1992
Personal Computer World - November 1993 01-11-1993
Byte October 1992 23-09-2009

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Apple III Apple June 1980
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Apple IIe Apple January 1983
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Apple Macintosh Quadra 650 Apple 21st October 1993
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Apple iMac G4 Apple 2002
Apple iMac G4 Apple 2002
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Apple eMac G4/1.0 (ATI) Apple 2003
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This exhibit has a reference ID of CH6619. Please quote this reference ID in any communication with the Centre for Computing History.


Apple Macintosh Quadra 950

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