Macintosh LC III+
 | |
| Macintosh LC III+ (Performa 460) | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | Personal Computer |
| Released | October 18, 1993 |
| Discontinued | February 14, 1994 |
| Intro price | US$1,349 |
| CPU | Motorola 68030 @ 33 MHz |
| Memory | 4 MB RAM (expandable to 36 MB) |
| Storage | 80 MB or 160 MB SCSI HDD, 1.44 MB SuperDrive |
| Display | 640×480 8-bit (512K VRAM) or 16-bit (768K VRAM) |
| Sound | 8-bit stereo input/output |
| Dimensions | 2.9" H × 12.2" W × 15.3" D |
| Weight | 8.8 lbs (4.0 kg) |
| OS / Firmware | System 7.1 – System 7.6.1 |
| Predecessor | Macintosh LC III |
| Successor | Macintosh LC 475 |
| Codename | Elsie III+ |
| Model no. | M1254 |
The Macintosh LC III+ is a personal computer released by Apple on October 18, 1993.[1] The LC III+ is essentially a faster version of the Macintosh LC III, with the processor clock speed increased from 25 MHz to 33 MHz.[2]
Model Variants
[edit | edit source]The LC III+ was sold under several Performa brand names for consumer markets:
- Performa 460 — Base configuration
- Performa 466 — With different bundle
- Performa 467 — With CD-ROM drive
Design Changes
[edit | edit source]The LC III+ introduced a redesigned case with a smoother, more curved front bezel compared to the angular design of earlier LC models. This design continued in subsequent LC-series machines.
Architecture and Processor
[edit | edit source]The LC III+ uses a Motorola 68030 processor running at 33 MHz with a full 32-bit data bus. This provides approximately a 32% speed increase over the 25 MHz LC III.[3]
Like the LC III, the LC III+ includes a socket for an optional Motorola 68882 FPU.
The Gestalt ID for the Macintosh LC III+ is 62.
Memory and Storage
[edit | edit source]RAM Configuration
[edit | edit source]The LC III+ shipped with 4 MB of RAM standard, expandable to 36 MB using a single 72-pin SIMM slot.
| Configuration | SIMM Required |
|---|---|
| 4 MB | 4 MB onboard |
| 8 MB | 4 MB onboard + 4 MB SIMM |
| 12 MB | 4 MB onboard + 8 MB SIMM |
| 20 MB | 4 MB onboard + 16 MB SIMM |
| 36 MB | 4 MB onboard + 32 MB SIMM |
Video RAM
[edit | edit source]The LC III+ includes 512 KB of VRAM onboard, expandable to 768 KB:
- 512 KB VRAM: 640×480 at 8-bit (256 colors)
- 768 KB VRAM: 640×480 at 16-bit (thousands of colors)
Storage Systems
[edit | edit source]Storage options included:
- 80 MB or 160 MB internal SCSI hard drive
- 1.44 MB SuperDrive
Input/Output and Expansion
[edit | edit source]Port Configuration
[edit | edit source]- 1× Apple Desktop Bus (ADB) port
- 1× External SCSI (DB-25)
- 1× Audio input (3.5mm stereo minijack)
- 1× Audio output (3.5mm stereo minijack)
- 2× Serial ports (Mini DIN-8)
- 1× Video output (DA-15)
Expansion
[edit | edit source]The LC III+ features a single LC Processor Direct Slot (LC PDS) and an FPU socket for the 68882 coprocessor.
General Maintenance
[edit | edit source]For detailed maintenance practices including cleaning, PRAM battery management, and connector care, refer to the dedicated Macintosh LC III+ General Maintenance page.
Troubleshooting
[edit | edit source]A comprehensive troubleshooting guide addressing common issues with the Macintosh LC III+ is available on the Macintosh LC III+ Troubleshooting page.
Capacitor Replacement
[edit | edit source]The Macintosh LC III+ logic board contains surface-mount electrolytic capacitors that commonly fail due to age. Detailed replacement guidelines can be found on the Macintosh LC III+ Capacitor Replacement Guide page.
Note: The LC III+ shares the same C22 reversed polarity silkscreen error as the LC III.
Technical Details
[edit | edit source]| Component | Specification |
|---|---|
| CPU | Motorola 68030 @ 33 MHz |
| FPU | Optional 68882 (socket provided) |
| PMMU | Integrated in 68030 |
| Data Bus | 32-bit |
| System Bus | 33 MHz |
| ROM | 1 MB |
| RAM | 4 MB (max 36 MB) |
| VRAM | 512 KB (max 768 KB) |