Mac LC III+

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

Macintosh LC III+

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.

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: DB-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

Cautions

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