Macintosh Performa 637CD
 | |
| Performa 630 with a CD-ROM drive; the 637CD uses the same case (Hellis, Italian Wikipedia, CC BY-SA 3.0) | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | Desktop personal computer |
| Released | 1 July 1994 (Apple); 18 July 1994 (EveryMac) |
| Discontinued | 1 July 1995 |
| Intro price | US$2,280 (EveryMac) |
| CPU | Motorola 68LC040 at 33 MHz, no FPU |
| Memory | 8 MB (4 MB on the logic board plus a SIMM); one 72-pin SIMM socket (80 ns); 36 MB maximum |
| Storage | 250 MB (Service Source) or 350 MB (Apple specification sheet) internal IDE hard drive |
| Display | — |
| Sound | 8-bit mono input; 8-bit stereo output (16-bit in CD mode) |
| Graphics | 1 MB DRAM frame buffer, not expandable; DB-15 port |
| ROM | 1 MB |
| Media | 1.4 MB Apple SuperDrive (manual insert); AppleCD 300i Plus double-speed CD-ROM drive |
| Ports / interface | One ADB, two RS-232/RS-422 serial (mini DIN-8), SCSI (DB-25), DB-15 video, sound in, sound out front and rear |
| Expansion | 114-pin LC processor-direct slot, 112-pin communications slot, 60-pin video-in slot, 10-pin TV tuner connector |
| Power | 100-240 V AC, 50-60 Hz, 45 W maximum |
| Dimensions | 4.3 × 16.5 × 12.6 in (10.95 × 41.95 × 32 cm) |
| Weight | 19 lb (8.6 kg) |
| OS / Firmware | System 7.1.2P to Mac OS 8.1 |
| Model no. | M3076 (Gestalt ID 98) |
The Macintosh Performa 637CD is a model in Apple's Performa 630 series with a 33 MHz 68LC040 and a CD-ROM drive. Apple's specification sheet gives it 8 MB of RAM as the minimum, a 350 MB IDE hard drive and a double-speed CD-ROM drive, introduced 1 July 1994.[1] Low End Mac describes it as the 636CD bundled with a display, sold only to higher education.[2] EveryMac lists it at US$2,280 with a 15-inch Apple colour monitor and an external 14.4k modem (order number M3598LL/A).[3]
The Macintosh Performa 630 page has the configuration table for the series, the full specification and a selection of Apple's symptom charts.
Configuration
[edit | edit source]Apple's service manual lists the Performa 637CD with 8 MB of RAM, a 1.4 MB SuperDrive, a 250 MB IDE hard drive, an internal AppleCD 300i Plus CD-ROM drive, a 15-inch Apple Performa Display, a TelePort send-fax/data modem, and the TV tuner and video-in cards installed.[4] Apple's specification sheet gives 350 MB as the minimum hard drive, and EveryMac also gives 350 MB but does not mention the TV cards.[1][3]
TV tuner and video-in cards
[edit | edit source]The logic board has a 60-pin video-in slot for real-time video display, capture and overlay, and a ribbon connector for an optional TV tuner card that takes NTSC or PAL from an aerial or cable.[4] The front panel has a receiver for Apple's optional infrared remote control.[4] Apple's symptom charts cover one fault on these cards: if some UHF channels cannot be tuned, replace a revision A video-in card (661-0159) with revision B (661-1073).[4]
Specifications
[edit | edit source]| Item | Specification |
|---|---|
| Processor | Motorola 68LC040 at 33 MHz, no FPU[4][1] |
| RAM | 4 MB on the logic board; one 72-pin SIMM socket, 80 ns; 36 MB maximum[1][4] |
| Video | 1 MB DRAM frame buffer, not expandable; up to 16 bits per pixel at 640 × 480, 8 bits at 800 × 600[4] |
| Drives | 1.4 MB SuperDrive, manual insert; IDE hard drive; AppleCD 300i Plus double-speed CD-ROM drive. Internal SCSI hard drives are not supported[4] |
| Sound | 8-bit mono input; 8-bit stereo output, 16-bit in CD mode, 0.5 V RMS into 39 ohms[4] |
| Electrical | 100-240 V AC, 50-60 Hz; 45 W maximum, not including the monitor[1][5] |
The Performa 630 Series volume prints the maximum power as "5 W"; Apple's specification sheet and the LC 630/Quadra 630/Performa 640 volume give 45 W.[4][1][5]
Battery
[edit | edit source]Apple's specification sheet gives the battery as 4.5 V alkaline.[1] The Service Source gives no test voltage; its symptom charts print "Unplug 5.4 battery" for the 20-second battery-unplug step, a misprint for 4.5, which the LC 630 volume prints for the same step.[4][5] Neutralise alkaline leakage with a weak acid such as vinegar; see Battery Explosion, Capacitor or Corrosion Damage.
Maintenance and repair
[edit | edit source]The Performa 637CD has the LC 630's case and logic board family, and the LC 630 guides apply: Macintosh LC 630 General Maintenance, Macintosh LC 630 Troubleshooting and Macintosh LC 630 Capacitor Replacement Guide.
Documentation
[edit | edit source]- Macintosh Performa 630 Series Service Source: Apple's service manual for the Performa 630 series.[4]
- LC 630/Quadra 630/ Performa 640 Service Source[5]
Related pages
[edit | edit source]- Macintosh Performa 630 and the rest of the Performa 630 series
- Macintosh Performa 636CD
- Macintosh Performa 638CDV
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Macintosh Performa 637CD: Technical Specifications, Apple—link(accessed 2026-09-30) Introduced 7/1/1994; RAM 8-36 MB; minimum hard drive 350 MB. 68LC040 at 33 MHz, no FPU; data path 32-bit, 33 MHz; slots LC, comm, TV, video in; one ADB; DB-15 video; 45 W maximum, 100-240 V, 50-60 Hz; battery type 4.5 V alkaline; 4 MB on the logic board, one 72-pin SIMM slot, 80 ns; 1 MB video DRAM; Gestalt ID 98; System 7.1.2P with System Enabler 405; 1 MB ROM; 2x CD-ROM.
- ↑ Performa 630 and LC 630, Low End Mac—link(accessed 2026-09-30) Model list: 635CD same as 630CD with 5 MB, bundled with modem and display; 636 same as 635CD but no CD-ROM or display, 8 MB; 636CD same as 636 with CD-ROM, higher education only; 637CD same as 636CD bundled with display, higher education only; 638CD same as 637CD without display, includes TV tuner/video input card; 638CD/V same as 638CD with TV tuner and multiscan display. PRAM battery 4.5 V alkaline. The IDE controller supports a single device; Macs with IDE drives do not supply SCSI termination power.
- ↑ 3.0 3.1 Apple Macintosh Performa 637CD Specs, EveryMac—link(accessed 2026-09-30) Introduced 18 July 1994, discontinued 1 July 1995; 8 MB (4 MB on board); 350 MB IDE; 2X CD-ROM; 14.4k external modem; identical to the 636CD but with a smaller hard drive and a 15-inch Apple colour monitor; order number M3598LL/A; model M3076; US$2,280.
- ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 Apple Computer, Macintosh Performa 630 Series Service Source (1995), File:Performa 630 series.pdf; see Macintosh Performa 630 Series Service Source. PDF page numbers: title p. 1; General Information pp. 3-6; Product Configuration pp. 7-12; Processor p. 18; Memory pp. 19-20; Disk Storage p. 21; I/O Interfaces pp. 22-24; Sound and Video p. 26; Electrical p. 27; Physical p. 28; Symptom Charts pp. 31-46 (battery step pp. 36, 43; video-in card p. 37; CD-ROM p. 41); Logic Board take-apart p. 70; Exploded View p. 120.
- ↑ 5.0 5.1 5.2 5.3 Apple Computer, LC 630/Quadra 630/Performa 640 Service Source, File:Quadra.lc 630.performa 640.pdf; see LC 630/Quadra 630/ Performa 640 Service Source. Electrical, PDF p. 27 (45 W); symptom chart, PDF p. 37 ("Unplug 4.5 battery").