At 33 MHz, the LC III+ (also known as the Performa 460) was the fastest 68030-based computer in the LC series.

The 460/LC III+ was essentially an LC III running the motherboard and CPU at 33 MHz instead of 25 MHz. In fact, with a small modification to the motherboard, the LC III can run at 33 MHz.

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Details

• introduced 1993.10.18 at $1,300; discontinued 1994.02.14
• Gestalt ID: 62
• model no.: M1254
• upgrade path: Quadra 605

Mac OS

• requires System 7.1 to 7.6.1
• addressing: 24-bit or 32-bit

Core System

• CPU: 33 MHz 68030
• FPU: 68882 (optional)
• ROM: 1 MB
• RAM: 4 MB on motherboard, expandable to 36 MB using a single 80ns 72-pin SIMM; can use 1 MB, 2 MB, 4 MB, 8 MB, 16 MB, or 32 MB SIMM
• L2 cache: none

Performance

• 4.6, relative to SE
• 8.3 MIPS
• 2.82, MacBench 2.0 CPU

Graphics

• video: 512 KB VRAM onboard, expandable to 768 KB; supports 512 x 384, 640 x 480, 640 x 870, and 832 x 624 resolutions
• VRAM: accepts one 256 KB 100ns VRAM SIMM to upgrade VRAM to 768 KB total, other specs unknown, VRAM SIMM appears to be specific to early Macs.
• video port: DA-15

Drives

• Hard drive: 40, 80, or 160 MB
• floppy drive: 1.4 MB double-sided

Expansion

• ADB ports: 1 for keyboard and mouse
• serial ports: 2 DIN-8 RS-422 on back of computer
• SCSI ports: DB-25 connector on back of computer
• expansion slot: enhanced LC PDS slot

Physical

• size (HxWxD): 2.9″ x 12.2″ x 15.3″
• Weight: 8.8 lbs.
• PRAM battery: 3.6V half-AA
• power supply: 50W

Accelerators & Upgrades

• Quadra 605 motherboard (25 MHz 68LC040), although it’s probably cheaper to just buy a Quadra 605/LC 475
• MicroMac Diimo/030 (50 MHz 68030), 64KB cache, optional 50 MHz 68882 FPU
• Sonnet Presto Plus (33 MHz 68LC040 or 68040, Ethernet, and 32 MB additional RAM)

Online Resources

• See: Online resources and links for the Mac LC III+

Cautions

• Serial port normally restricted to 57.6 kbps; throughput with a 56k modem may be limited. See 56k modem page. For more information on Mac serial ports, read Macintosh Serial Throughputl.

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