The 66 MHz 7100 was the middle of the Power Mac line when Apple introduced its first PowerPC models in March 1994. Built into the Quadra 650 case, the 7100 has three NuBus slots and a PDS (processor direct slot).

The 7100 uses system memory for motherboard video (up to 615 KB, depending on resolution and bit-depth) and also includes a separate PDS video card with its own memory, making it very easy to work with two monitors. For best performance, use the video card instead motherboard video with a single monitor.

Note that these so-called NuBus processor upgrades do not go into a NuBus slot; they derive their name from the fact that they work in NuBus Power Macs. The processor upgrades fit into the PDS, which is normally occupied by a video card on the 7100. These cards may also include a pass through connector (which may be an extra cost option), allowing you to plug the PDS video card into the upgrade card.

Specs (via Low End Mac)

• Cpu: 66 or 80 MHz PPC 601
• Bus: 33 or 40 MHz
• Performance: 2.2 (66 MHz, relative to Centris 650); 25.87 (66 MHz), MacBench 2.0
• Ram: 8 MB on motherboard, expandable to 136 MB using two pairs of 80ns 72-pin SIMMs (4 sockets total). Supports 4, 8, 16, and 32 MB SIMMs. Will not recognize more than 32 MB per SIMM even if you install 64 MB SIMMs.
• Rom: 4 MB
• L2 Cache: optional on 7100/66, 256 KB standard on 7100/80, supports 256 KB to 1 MB cache
• Hard Drive: 250-500 MB @ 66 MHz, 350-700 MB @ 80 MHz
• Video: internal supports thousands of colors at 640 x 480 and 256 colors at 832 x 642 PDS card supports thousands of colors at 640 x 480 and 832 x 624, 256 of colors at 1024 x 768 and 1152 x 870 AV card supports millions of colors at 640 x 480 and 832 x 624, thousands of colors at 1024 x 768 and 1152 x 870
• Vram: none on motherboard, 1 MB on PDS video card (expandable to 2 MB), 2 MB on AV card (not expandable)
• Gestalt Id: 112 (66 MHz), 47 (80 MHz)
• Adb: 1 port for keyboard and mouse
• Scsi: DB-25 connector on back of computer
• Serial: 2 DIN-8 GeoPorts on back of computer
• Ethernet: AAUI connector on back of computer, requires AAUI adapter
• Pram Battery: 3.6V half-AA
• Weight: 25.0 lb
• Cd-Rom: 2x standard
• Microphone: standard 3.5mm minijack, compatible with line-level input including Apple’s PlainTalk microphone
• Nubus Slots: 3
• Power Supply: 230W
• Height: 6.0 in
• Width: 13.0 in
• Depth: 16.5 in
• Beware Bogus 256K Cache Module Ap2544-02: it doesn’t do anything on the 6100 or 7100.
• See: Online resources and links for the Power Mac 7100