Josh: Add Service Documentation section with embedded Apple Service Source PDF

2026-02-10T11:12:33Z

Add Service Documentation section with embedded Apple Service Source PDF

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			== Service Documentation ==

			The official Apple Service Source documentation for this model:

			<pdf width="800" height="500">File:Quadra_605.lc_series.pdf</pdf>

	== See Also ==		== See Also ==

Josh: Created main article for Macintosh Performa 476 (Quadra 605/LC 475 variant)

2026-02-10T11:06:09Z

Created main article for Macintosh Performa 476 (Quadra 605/LC 475 variant)

New page

{{Infobox computer
| name = Macintosh Performa 476
| image = [[File:Macintosh_LC_475.jpg]]
| caption = Macintosh Performa 476
| manufacturer = Apple Computer, Inc.
| type = Personal Computer
| release date = October 21, 1993
| discontinued = October 17, 1994
| price = US$1,460
| cpu = Motorola 68LC040 @ 25 MHz
| memory = 4 MB RAM (expandable to 36 MB)
| storage = 230 MB IDE hard drive, 1.44 MB floppy
| display = Supports 640×480 16-bit, 832×624 8-bit
| sound = Apple Sound Chip, stereo 16-bit
| dimensions = 2.9" H × 16.5" W × 12.6" D
| weight = 8.0 lbs (3.6 kg)
| os = System 7.1 – Mac OS 8.1
| predecessor =
| successor = [[Macintosh Performa 580|Performa 580]]
| codename = Aladdin
| model = M1476
}}

The '''Macintosh Performa 476''' is a consumer-oriented personal computer released by Apple in October 1993.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_performa/specs/mac_performa_476.html |title=Apple Macintosh Performa 476 Specs |publisher=EveryMac |access-date=2026-02-10}}</ref> It shares the same logic board and compact "pizza box" enclosure as the [[Macintosh Quadra 605|Quadra 605]] and [[Macintosh LC 475|LC 475]], distinguished from the [[Macintosh Performa 475|Performa 475]] by its larger 230 MB hard drive and regional availability.

The Performa 476 was bundled with 4 MB of RAM, a 230 MB hard drive, and consumer software including ClarisWorks, At Ease, and various entertainment titles. Like its siblings, it features a Motorola 68LC040 processor running at 25 MHz—the "LC" variant lacking the integrated floating-point unit found in the full 68040.

== Model Variants ==
The Performa 476 is one of several models based on identical hardware:

* '''[[Macintosh Quadra 605|Quadra 605]]''' — Business/professional variant
* '''[[Macintosh LC 475|LC 475]]''' — Education market variant
* '''[[Macintosh Performa 475|Performa 475]]''' — Consumer variant (160 MB HD)
* '''[[Macintosh Performa 476|Performa 476]]''' — Consumer variant with larger storage (this model)

All share the same logic board, making maintenance and troubleshooting procedures interchangeable.

== Architecture and Processor ==
The Performa 476 uses the Motorola 68LC040 processor clocked at 25 MHz. The 68LC040 is a cost-reduced version of the 68040, with the floating-point unit disabled. Software requiring FPU functionality requires third-party software emulation.

The processor connects via a 32-bit data bus and 32-bit address bus. A 16 KB unified instruction and data cache is integrated into the processor.

== Memory and Storage ==

=== RAM Configuration ===
The Performa 476 ships with 4 MB of RAM soldered to the logic board. A single 72-pin SIMM slot accepts modules from 4 MB to 32 MB, allowing a maximum of 36 MB total system RAM.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_performa/specs/mac_performa_476.html |title=Performa 476 RAM |publisher=EveryMac |access-date=2026-02-10}}</ref>

=== Storage ===
A 230 MB IDE hard drive is standard—larger than the 160 MB drive in the Performa 475. The internal 2.5" drive bay accepts IDE drives up to the capacity limits of the System Software version installed. A 1.44 MB SuperDrive provides floppy disk support.

== Display and Graphics ==
Video is provided by an integrated graphics controller with 512 KB of VRAM soldered to the logic board, expandable to 1 MB via a VRAM expansion slot. Display capabilities include:

* 640×480 at 16-bit color (thousands of colors)
* 832×624 at 8-bit color (256 colors) with 1 MB VRAM

An HDI-45 connector provides video output compatible with Apple monitors.

== Audio Capabilities ==
The Apple Sound Chip (ASC) provides 16-bit stereo audio input and output at 22.254 kHz sample rate. A 3.5 mm stereo output jack is located on the rear panel. An internal speaker provides mono audio when headphones are not connected.

== Input/Output and Expansion ==

=== Port Configuration ===
* 2× Mini DIN-8 serial ports (printer and modem)
* 1× ADB port (keyboard and mouse)
* 1× HDI-45 video port
* 1× 3.5 mm stereo audio output
* 1× 3.5 mm audio input

=== Expansion ===
One LC Processor Direct Slot (LC PDS) provides expansion capability for network cards, video capture cards, and other peripherals. The slot uses the 68040 bus protocol rather than the NuBus protocol found in higher-end Macintosh systems.

== General Maintenance ==
For detailed maintenance practices including cleaning, PRAM battery management, connector corrosion prevention, and general care, refer to the dedicated [[Macintosh Quadra 605 General Maintenance]] page. The Performa 476 shares identical internal hardware with the Quadra 605.

== Capacitor Replacement Guide ==
Electrolytic capacitors on the logic board require replacement after approximately 30 years. Detailed capacitor specifications and replacement procedures can be found on the [[Macintosh Quadra 605 Capacitor Replacement Guide]] page.

== Troubleshooting ==
A comprehensive troubleshooting guide addressing common issues including startup problems, video issues, and Sad Mac errors is available on the [[Macintosh Quadra 605 Troubleshooting]] page.

== Technical Details ==
<templatestyles src="Template:StyledTable/styles.css" />

=== System Architecture at a Glance ===
{| class="wikitable styled-table" style="width:90%; text-align:center;"
! Sub-system !! Specification (Macintosh Performa 476, October 1993)
|-
| '''CPU''' || Motorola 68LC040 @ 25 MHz
|-
| '''FPU''' || None (LC variant)
|-
| '''Bus width''' || 32-bit data • 32-bit address
|-
| '''L1 Cache''' || 16 KB unified (on-chip)
|-
| '''RAM''' || 4 MB soldered + 1× 72-pin SIMM (max 36 MB)
|-
| '''VRAM''' || 512 KB (expandable to 1 MB)
|-
| '''Storage''' || 230 MB IDE, 1.44 MB floppy
|-
| '''Ports''' || 2× Serial, 1× ADB, HDI-45 video, Audio I/O
|-
| '''Expansion''' || 1× LC PDS
|}

== See Also ==
* [[Macintosh Quadra 605]]
* [[Macintosh LC 475]]
* [[Macintosh Performa 475]]

== References ==
<references />

[[Category:Apple Vintage Computers]]

Macintosh Performa 476 - Revision history

Josh: Add Service Documentation section with embedded Apple Service Source PDF

Josh: Created main article for Macintosh Performa 476 (Quadra 605/LC 475 variant)