256 MB Type of RAM: 30-pin SIMM (16 slots) Minimum RAM Speed: 80 ns Interleaving Support: No Graphics: Integrated Display Connection: DB-15 Graphics Memory: 1 MB standard, upgradable to 2 MB via 4 VRAM slots Expansion Slots: 5 - NuBus, 1 - PDS Hard Drive Bus: SCSI Backup Battery: 3.6 V Lithium Max Watts: 303 W Ports: AAUI-15 Ethernet, 1 ADB, DB-25 SCSI, 2 Serial, 3.5-mm mono input jack, 3.5-mm stereo output jack Timeline References External links Everymac.com - Macintosh Quadra 900 specifications Dale Adams on Quadra 700 & 900 On-board Video Capabilities 900 Quadra 900 Quadra 900 Quadra 900 Quadra 900 Computer-related introductions in 1991