Apple Macintosh Quadra 950
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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 RetroComputers.Online
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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.