Macintosh Performa 636CD
 | |
| Macintosh Performa 636CD | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | Personal Computer |
| Released | July 18, 1994 |
| Discontinued | February 1996 |
| Intro price | US$1,649 |
| CPU | Motorola 68LC040 @ 33 MHz |
| Memory | 4 MB RAM (expandable to 36 MB) |
| Storage | 250 MB IDE hard drive, 2× CD-ROM, 1.44 MB floppy drive |
| Display | Supports up to 832×624 at 8-bit color |
| Sound | 8-bit mono input, 8-bit stereo output (16-bit in CD mode) |
| Dimensions | 4.3" H × 16.5" W × 12.6" D (10.95 × 41.95 × 32 cm) |
| Weight | 19 lbs (8.6 kg) |
| OS / Firmware | System 7.1.2P – Mac OS 8.1 |
| Predecessor | Performa 600CD |
| Successor | Performa 6200CD |
| Codename | Crusader |
| Model no. | M3076 |
The Macintosh Performa 636CD is a personal computer manufactured by Apple Computer and released on July 18, 1994.[1] It is the Performa 636 with an added CD-ROM drive, sold exclusively to the higher-education market.
Target Market
Like the Performa 636, the 636CD was available only through higher-education sales channels (colleges and universities).[2]
Architecture and Processor
The Performa 636CD uses a Motorola 68LC040 processor running at 33 MHz without an integrated FPU.
Memory and Storage
The system ships with 4 MB of RAM soldered to the logic board. A single 72-pin SIMM socket allows expansion up to 36 MB total.
Storage includes:
- 250 MB IDE hard drive
- 2× Apple CD 300i plus CD-ROM drive
- 1.44 MB SuperDrive floppy
Display and Graphics
1 MB of dedicated DRAM for video. Supported resolutions:
- 512×384, 640×480: 16-bit color
- 800×600, 832×624: 8-bit color
Variants
- Performa 636 – Without CD-ROM
- Performa 637CD – 636CD with display bundle and 350 MB HD
General Maintenance
For maintenance procedures, refer to the Macintosh LC 630 General Maintenance page.
Capacitor Replacement Guide
See the Macintosh LC 630 Capacitor Replacement Guide page.
Troubleshooting
See the Macintosh LC 630 Troubleshooting page.
Service Documentation
The official Apple Service Source documentation for this model:
Apple service data
Apple's own figures for the 630 series, from the Macintosh Performa 630 Series Service Source volume hosted on this wiki.[3]
| Item | Apple's figure |
|---|---|
| Case | Height 4.3 in. (10.95 cm), width 16.5 in. (41.95 cm), depth 12.6 in. (32 cm) |
| Weight | Without CD-ROM 17 lb. (7.7 kg); with CD-ROM 19 lb. (8.6 kg) |
| Line voltage | 100–240 VAC, 50–60 Hz |
| Maximum power | 45 W, not including the monitor |
| ROM | 1 MB |
| DRAM | 4 MB built in, expandable to 36 MB if the logic board has one SIMM slot (part number 661-0158) or 52 MB if it has two (part number 661-1114; one ordinary slot and one single-sided slot) |
| Video | 1 MB DRAM frame buffer; video memory cannot be expanded. Up to 16 bits per pixel on 12-, 13- and 14-inch Apple monitors, the 15-inch multiple-scan and VGA (640×480); up to 8 bits per pixel on the Apple 16-inch and SVGA (800×600) |
| Sound | 8-bit monophonic sound input; 8-bit stereo output (16-bit in CD mode), nominally 0.5 V RMS into 39 ohms. Internal speaker muted when a plug is inserted in an output jack |
| Microphone | Electret, omnidirectional, running on 8 VDC supplied by the sound-input port |
| Storage | IDE hard drive. Apple states that 630-series machines do not support internal SCSI hard drives — the internal IDE interface was new to Apple with this family |
| Slots | Processor-direct slot 114-pin (LC-compatible); communications slot 112-pin; video-in slot 60-pin; TV tuner port 10-pin |
| SCSI | One external DB-25 port, up to six external devices |
Maximum power is printed as "5 W" in the Performa 630 Series volume. The LC 630/Quadra 630/Performa 640 volume, covering the same logic board and the same chassis, prints 45 W in the same field; 5 W is an Apple typographical error and 45 W is used here.[3][4]
A PRAM battery threshold is given nowhere in either 630-series volume. Apple's symptom chart step appears as "Unplug 4.5 battery" in the LC 630 volume and "Unplug 5.4 battery" in the Performa 630 volume — for the identical instruction, in the same family. The Performa 6200/6300 volume, for the machine that replaced this one in the same chassis, prints "Unplug 4.5 V battery" with the unit spelled out, and gives replace below 3.0 V measured on the 10 V DC scale. Treat "5.4" as a transposition of 4.5, identify the pack from its own markings before buying a replacement, and neutralise any leakage with sodium bicarbonate unless the cell in front of you is marked alkaline.[3][4]
See Also
References
- ↑ Macintosh Performa 636: Technical Specifications, Apple Inc.—link(accessed 2026-02-10)
- ↑ Macintosh Quadra 630, Wikipedia—link(accessed 2026-02-10)
- ↑ 3.0 3.1 3.2 Apple Computer, Macintosh Performa 630 Series, Service Source. Hosted here as Macintosh Performa 630 Series Service Source (File:Performa_630_series.pdf). Specifications chapter.
- ↑ 4.0 4.1 Apple Computer, LC 630/Quadra 630/Performa 640, Service Source. Hosted here as LC 630/Quadra 630/ Performa 640 Service Source (File:Quadra.lc_630.performa_640.pdf). Specifications chapter.