Macintosh Quadra 900

The Macintosh Quadra 900 was sold 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. The Quadra 900 was more expandable than the Quadra 700 but cost $7,200 U.S. The Quadra 900 could be upgraded to 256 megabytes of RAM, 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. System 7.0.1 was included and supports up to Mac OS 8.1. It is the earliest Macintosh model with the ability to run Mac OS 8.

History of Macintosh Quadra 900 is provided by wikipedia

Macintosh Quadra 900 – General information

IntroducedOctober 1991
DiscontinuedMay 1992
Model Identifier28
Model NumberM4200
Order NumberM4210LL/A (no hard drive)
M4230LL/A (160 MB hard drive)
Weight25.3 Ibs.
11.475 KG
Dimensions18.6” H x 8.9” W x 20.6” D
47.24 cm H x 22.6 cm W x 52.32 cm D
ProcessorMotorola 68040
Processor Speed25 MHz
Number of Cores1
System Bus25 MHz
Cache8 KB L1
CoprocessorIntegrated FPU
Storage & Media
Storage160 MB
400 MB
Media2 – CD-ROM
1 – 1.44 MB Floppy
Optional DDS-DC drive
Built-in MemoryNone
Maximum Memory256 MB
Memory Slots16 – 30 pin SIMMs
Minimum Speed80 ns
Interleaving SupportNo
Built-in DisplayNone
Graphics CardNone
Graphics Memory1 – 2 MB (via four sockets)
Display Connection1 – DB-15
Expansion Slots5 – NuBus
1 – PDS (Cache Bus)
Hard Drive InterfaceSCSI
Original OSSystem Software 7.0.1
Maximum OSMac OS 8.1
FirmwareMacintosh ROM
SCSI1 – DB-25
Floppy PortNone
Audio In1 – 3.5-mm mono input jack
Audio Out1 – 3.5-mm stereo output jack
Display1 – DB-15
Backup Battery3.6 V lithium
Maximum Continuous Power303 W
Line VoltageUnknown
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Source: Wikipedia, Mac Collection, Apple

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