Macintosh LC III+

Macintosh LC III+

Performa 460, the consumer version of the LC III+
Specifications
Manufacturer	Apple Computer, Inc.
Type	Desktop personal computer
Released	October 18, 1993
Discontinued	February 14, 1994
Intro price	US$1,300
CPU	Motorola 68030 at 33 MHz
Memory	4 MB on board, expandable to 36 MB
Storage	80 or 160 MB SCSI hard drive; 1.4 MB SuperDrive
Display	External; 512 KB VRAM, expandable to 768 KB
Sound	8-bit mono
Dimensions	7.7 × 31.0 × 38.2 cm (3.0 × 12.2 × 15.0 in)
Weight	4.0 kg (8.8 lb)
OS / Firmware	System 7.1 – Mac OS 7.6.1
Predecessor	Macintosh LC III
Successor	Macintosh LC 475
Model no.	M1254

The Macintosh LC III+ is a desktop Macintosh introduced by Apple on October 18, 1993 and discontinued on February 14, 1994. It is the Macintosh LC III with its processor and board running at 33 MHz instead of 25 MHz. Low End Mac gives the introductory price as US$1,300.

Models

The LC III+ was sold to consumers as the Performa 460, 466 and 467. Apple's service manual lists them together with a 33 MHz 68030 and gives the configurations as introduced:

Performa versions (Service Source pp. 8, 13)

Model	Hard drive	Bundled monitor
Performa 460	80 MB	Performa Display
Performa 466	160 MB	Performa Display Plus
Performa 467	160 MB	Performa Display Plus

The LC III+ introduced a new case front, smoother and more curved than the LC III's, with a rounded foot and finger recesses above and below the floppy slot.

Hardware

The processor is a 68030 at 33 MHz with a 32-bit data path and a socket for an optional 68882 FPU. Low End Mac records 8.3 MIPS and a MacBench 2.0 CPU score of 2.82, against 6.3 MIPS and 2.31 for the 25 MHz LC III.

Memory is 4 MB soldered to the board plus one 72-pin SIMM socket taking a 1, 2, 4, 8, 16 or 32 MB SIMM, for 36 MB in total; Apple specifies 80 ns or faster. The ROM is 1 MB.

Video uses 512 KB of VRAM soldered to the board and one socket for a 256 KB VRAM SIMM, for 768 KB. EveryMac gives 640 × 480 at 16-bit and 832 × 624 at 8-bit with 512 KB, and 832 × 624 at 16-bit with 768 KB.

Apple's specification for the ports and slot:

I/O (Service Source pp. 9–12)

Interface	Detail
Serial	Two RS-232/RS-422 ports, mini DIN-8
SCSI	DB-25
ADB	One port, mini DIN-4
Video	DB-15 monitor port
Sound	Mono input; 8-bit mono output feeding both channels
Expansion	114-pin processor-direct slot for 020/030 cards
Floppy drive	Apple SuperDrive, manual insert

The power supply is Apple part 661-1733, shared with the rest of the LC family, running from 100–240 VAC. The PRAM battery is a 3.6 V lithium half-AA cell, Apple part 742-0011; Apple says to replace it below 3.0 V.

Apple's technical specifications give the Gestalt ID as 62, the original system software as System 7.1 with System Enabler 003 v1.1, and supported versions up to Mac OS 7.6.1; EveryMac notes that 7.5.2 is not supported.

Known faults

• The LC III board has one capacitor, C22 on the −5 V rail, silk-screened and fitted backwards at the factory, and Doug Brown's article on it treats the Performa 460, 466 and 467 as the same design. See Macintosh LC III+ Capacitor Replacement Guide.
• Leaking surface-mount capacitors on the logic board and in the power supply.
• A flat or missing PRAM battery: several of Apple's no-video and no-power symptom entries for this family start with "Check batteries".

Service documentation

Apple covers the LC III+ only in the Macintosh Performa 400 Series Service Source, as the Performa 460/466/467. Apple's Macintosh LC III Developer Note describes the 25 MHz board.

Related pages

• Macintosh LC III+ General Maintenance
• Macintosh LC III+ Troubleshooting
• Macintosh LC III+ Capacitor Replacement Guide
• Macintosh LC III
• Macintosh LC III Developer Note