Macintosh Quadra 900
The Macintosh Quadra 900 is a high-end 68040-powered desktop tower that was released in October 1991.
Specifications
According to everymac.com.
| Spec | Details |
|---|---|
| Release Date | October 1991 |
| Discontinuation Date | May 1992 |
| Processor | Motorola 68040 @25MHz |
| RAM | 16x 30-pin SIMM Slots - 4MB Standard - 256MB Maximum |
| Hard Disk | 3.5" SCSI - 160 or 400MB Standard |
| Graphics | 1 or 2MB VRAM |
| Audio | Internal Speaker |
| Internal Drives | - Auto Inject 3.5" 1.44MB Floppy Drive - Caddy-Loading 2X CD-ROM (Optional, aftermarket) |
| Expansion | - 5x NuBus - 1x 040 PDS |
| Networking | AAUI Ethernet |
| Other I/O | - 1x ADB - 2x Serial - 1x DB25 SCSI - 1x DB15 Video Out - 1x Line Out - 1x Mic In - 2x RCA Jacks (also for audio?) |
| PRAM Battery | 1/2AA Lithium |
| Original Mac OS | System 7.0.1 |
| Maximum Mac OS | Mac OS 8.1 |
Upgrades
SSD Upgrade
Check our page on SCSI SSD replacements for more info.
Resources
 Service Manual |
|---|
Common Faults & Maintenance
PRAM Battery Leaks
The 1/2AA Lithium PRAM battery in the 900 is very prone to leaking and should be removed. It does not need to be replaced on this model for the computer to operate.
Capacitors
The 900's logic board uses all solid-state capacitors, so you do not need to replace any if yours is working. The power supply may still need recapping.
Page last updated (MM/DD/YYYY): 09/19/2024
Update Reason: page rewritten
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