Apple · Macintosh

Macintosh Quadra 900

Released October 1991

A 25 MHz 68040 Macintosh tower with built-in colour video and Ethernet, five NuBus slots and room for multiple drives.

Product links

Processor: 68040 25 MHz (Macintosh Quadra 900)
CPU cores: 1
Memory: 4 MB
Storage: 160 MB to 400 MB
CPU: 25 MHz Motorola 68040 with integrated memory-management and floating-point units and 8 KB on-chip cache; no standard L2 cache
GPU: Built-in video with 1 MB VRAM, expandable to 2 MB; Apple lists 8-bit colour at 640 × 480, 832 × 624 and 1152 × 870 with standard VRAM, and 24-bit at 640 × 480 and 832 × 624 with 2 MB
Memory type: Sixteen 30-pin 80 ns SIMM slots in banks of four, with 4 MB standard. Apple's October 1991 catalogue supported 64 MB using 4 MB SIMMs; its later support sheet lists a 256 MB technical maximum using larger modules but notes 8 MB and 16 MB SIMMs are not supported by Apple. Original UK maker brochure explicitly advertises 256 MB using 16 MB SIMMs; that original maker qualification differs from the later support sheet's unsupported-module note.
Storage type: Internal 1.44 MB SuperDrive and optional 160 MB SCSI hard drive at launch; Apple listed a 400 MB version for January 1992. The case supports three further internal SCSI devices, including a removable-media device.
Expansion slots: Five NuBus '90 slots and one processor-direct slot

Ports: Ethernet, headphone jack
Back ports: Apple Desktop Bus, DB-15 video, DB-25 SCSI, two serial ports, AAUI Ethernet, mono sound input and stereo sound output
External displays: Built-in video supports Apple's monitor range, with colour depth depending on VRAM and resolution; Apple's launch catalogue also names VGA, NTSC and PAL monitor support
Speakers: Internal speaker, mono audio input and stereo sound output; Apple supplied a microphone

Type: Tower
Weight: 16.7 kg
Width × depth × height: 226 × 523 × 473 mm
Operating system: macOS
Size and weight detail: Apple's 18.6 × 8.9 × 20.6 inch dimensions and 36.8 lb weight for the floppy-only model; metric fields are rounded conversions
Power supply: Maximum 303 W, 100–240 V AC, 50–60 Hz; 3.6 V lithium clock battery and keyboard soft power
In the box: Original System Software 7.0.1, microphone and ADB mouse; Apple's October 1991 catalogue says the keyboard was sold separately

Processor	Memory	Storage	Storage type
68040 25 MHz (Macintosh Quadra 900)	4 MB	–	–
68040 25 MHz (Macintosh Quadra 900)	4 MB	160 MB	Hard drive
68040 25 MHz (Macintosh Quadra 900)	4 MB	400 MB	Hard drive

Model	Type	Processor	Memory	Storage	Screen	Weight	Released
AppleMacintosh Quadra 700	Tower	68040 25 MHz (Quadra 700)	4 MB	80 MB – 400 MB	–	6.2 kg	Oct 1991
AppleMacintosh Quadra 840AV	Tower	68040 40 MHz (Macintosh Quadra 840AV)	4 MB	230 MB – 1 GB	–	11.48 kg	1993
AppleMacintosh Quadra 950	Tower	68040 33 MHz (Macintosh Quadra 950)	8 MB	230 MB – 400 MB	–	16.7 kg	May 1992