Macintosh LC 630
.jpg) | |
| Macintosh LC 630 (Stephen Edmonds, CC BY-SA 2.5) | |
| Specifications | |
|---|---|
| Manufacturer | Apple Computer, Inc. |
| Type | Desktop personal computer |
| Released | 3 November 1994 (Apple); 18 July 1994 (EveryMac, Low End Mac) |
| Discontinued | 2 March 1996 |
| Intro price | US$1,350 (4 MB) or US$2,080 (8 MB with CD-ROM) |
| CPU | Motorola 68LC040 at 33 MHz (Quadra 630: 68040 with FPU) |
| Memory | 4 MB on the logic board; 36 MB maximum on one-SIMM boards, 52 MB on two-SIMM boards (72-pin, 80 ns) |
| Storage | 250 MB or 350 MB 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 |
| ROM | 1 MB |
| Media | 1.4 MB Apple SuperDrive (manual insert); optional internal AppleCD 300i Plus |
| Ports / interface | ADB, two RS-232/RS-422 serial (mini DIN-8), SCSI (DB-25), video (DB-15), sound in, sound out front and rear |
| Expansion | 114-pin I/O expansion slot (LC PDS compatible), 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 | 17 lb (7.7 kg) without CD-ROM; 19 lb (8.6 kg) with |
| OS / Firmware | System 7.1.2P to Mac OS 8.1 |
| Predecessor | Macintosh Quadra 610 (Quadra 630) |
| Codename | Crusader |
| Model no. | M3076 (Gestalt ID 98) |
The Macintosh LC 630 is a low-profile desktop Macintosh that Apple sold to the education market from 1994 to 1996. It is one of three versions of the same design: the Macintosh Quadra 630 for business, the Performa 630 series for consumers and the LC 630 for schools.[1] The LC 630 has a 33 MHz 68LC040, which lacks the floating-point unit of the Quadra 630's 68040. Apple's service manual notes that the internal IDE hard drive interface was new to Apple products; the 630 series has no internal SCSI hard drive.[2]
History
[edit | edit source]Apple introduced the Quadra 630 and the Performa 630 models on 18 July 1994 and the LC 630 on 3 November 1994, according to Apple's own specification sheet; EveryMac and Low End Mac give 18 July 1994 for the LC 630 as well.[3][4][5] The LC 630 was sold in two configurations, order numbers M3305LL/A with 4 MB and M3492LL/A with 8 MB and a CD-ROM drive.[4] Apple's developer note lists LC 630 builds with 4 or 8 MB, 250 or 350 MB hard disks and optional CD-ROM, video input and TV tuner, and notes that a version of the LC 630 would be sold in some regions as the Performa 630.[6]
The Macintosh LC 630 DOS Compatible followed on 3 April 1995, adding a card with an Intel 486DX2 processor.[1] Apple's upgrade path out of the 630 was the Power Macintosh 5300/6300 logic board upgrade, which the service manual lists as unsupported on DOS-compatible machines.[7]
Specifications
[edit | edit source]| Item | Figure |
|---|---|
| Processor | Motorola 68LC040 at 33 MHz (bus clock; the processor runs internally at 66 MHz). The Quadra 630 uses the 68040 with floating-point unit |
| Addressing | 32-bit registers, 32-bit address bus, 32-bit data bus |
| DRAM | 4 MB built in, 8 MB optional; expandable to 36 MB on a logic board with one SIMM slot (661-0158) or 52 MB on a board with two (661-1114), where the second slot takes single-sided SIMMs only. 72-pin, 80 ns or faster |
| Frame buffer | 1 MB of DRAM; the 630 series does not support video memory expansion |
| ROM | 1 MB |
| Floppy drive | 1.4 MB Apple SuperDrive, manual insert |
| Hard drive | 250 MB or 350 MB, IDE |
| CD-ROM | Optional AppleCD 300i Plus |
| SCSI | One external DB-25 port, up to six external devices |
| Serial | Two RS-232/RS-422 ports, mini DIN-8 |
| ADB | One port, mini DIN-4 |
| Video | DB-15 monitor port on a built-in video daughterboard; up to 16 bits per pixel on Apple 12- to 15-inch monitors and VGA, 8 bits per pixel on the 16-inch monitor and SVGA (800 × 600) |
| Sound | 8-bit mono input with bias current for an electret microphone; 8-bit stereo output (16-bit in CD mode), nominally 0.5 V RMS into 39 Ω; internal speaker muted when a plug is inserted |
| Expansion | 114-pin processor-direct slot for an LC-compatible card; 112-pin communications slot for a modem or Ethernet card; 60-pin video-in slot; 10-pin TV tuner connector |
| Controls | Soft power from the keyboard; front-panel volume buttons and headphone jack; optional infrared remote |
| Power | 100-240 V AC, 50-60 Hz; 45 W maximum, not including the monitor |
| Dimensions | 4.3 in high, 16.5 in wide, 12.6 in deep (10.95 × 41.95 × 32 cm) |
| Weight | 17 lb (7.7 kg) without CD-ROM, 19 lb (8.6 kg) with; varies with options |
Apple's specification sheet gives the PRAM battery as a 4.5 V alkaline type.[3] The developer note describes the sound input jack as stereo in, mono record, where the service manual lists a mono input port.[6][2]
Hardware
[edit | edit source]Logic board
[edit | edit source]The logic board plugs into a connector at the front of the case and slides out of the back once the rear cover is off; the user can reach the RAM and the expansion slots this way.[6] Recap-a-Mac's photographed board is marked 820-0548-B, copyright 1994.[8] Apple's service part numbers are 661-0158 (non-DOS), 661-0189 (Quadra 630), 661-1114 (DOS) and 661-1115 (DOS, international); the memory specification identifies 661-0158 as the one-SIMM board and 661-1114 as the two-SIMM board.[9][2]
The design is built around five custom chips: the F108 memory controller (which also contains the SCSI controller, the SCC and the IDE interface), the PrimeTime II I/O bus adapter (with VIA1, VIA2, the SWIM II floppy controller and the sound buffers), the DFAC II sound input processor, the Cuda microcontroller (ADB, parameter RAM, real-time clock and soft power) and the Valkyrie video controller.[10] The processor sits in a socket, so a 68LC040 can be replaced with a 68040 to add the FPU. An expansion card cannot add an FPU, because the 68LC040 has no coprocessor interface and the slot signals do not connect directly to the CPU.[10]
Memory and video
[edit | edit source]Apple gives two ceilings: 36 MB for a board with one SIMM slot and 52 MB for a board with two, the second slot taking single-sided SIMMs only.[2] Low End Mac reports that the slot also accepts single-banked 64 MB SIMMs, for 68 MB in total.[5]
The display memory is 1 MB of 60 ns DRAM, separate from main memory, used in place of VRAM to reduce cost. It holds the graphics frame buffer and two frame buffers for the video input module. The Valkyrie controller supports 1, 2, 4, 8 and 16 bits per pixel, and does not support 24 bits per pixel. Live video from the video-in module cannot be shown on monitors larger than 800 × 600.[10]
Storage
[edit | edit source]The internal hard drive is IDE and the internal CD-ROM drive is SCSI. Apple's service manual says IDE drives must be replaced like for like, that the IDE drive does not affect SCSI ID selection or termination, and that the internal CD-ROM drive was set to SCSI ID 3 at the factory.[11][12] Low End Mac notes three limits: the IDE controller supports a single device, at up to PIO mode 3; Apple HD SC Setup from System 7.5.1 and earlier does not recognise later IDE drives, which need System 7.5.2 or later and Drive Setup 1.0.3 or higher; and the IDE machines do not supply SCSI termination power, relying on external devices for it.[5]
Expansion
[edit | edit source]The I/O expansion slot accepts most LC and LC III PDS cards, but not accelerators, 68882 FPU cards or cache cards. The communications slot takes the cards made for the Macintosh LC 575: 10BASE-T, 10BASE2 and AAUI Ethernet, and the 14.4 fax/data modem.[6] Apple limits a card in the I/O slot to 4 W in total, with at most 800 mA at +5 V, 20 mA at −5 V and 200 mA at +12 V.[13] The machine runs only in 32-bit addressing mode, so it does not support the Apple IIe Card for the Macintosh LC.[6]
Fan
[edit | edit source]The 630 has a fan, mounted on the fan/video card bracket (service part 922-1160) with the video daughterboard that carries the monitor port. The fan has a two-pin cable to the logic board, which is disconnected when the bracket comes out.[14][9] Several of Apple's symptom charts branch on whether the fan is running, and one cure for a dark screen is to check the monitor-out daughterboard connection on the fan bracket.[12]
Power supply and soft power
[edit | edit source]The power supply is service part 661-0170.[9] The machine is switched on through soft power, from the Power key on the keyboard or the remote control, and the Cuda chip controls the supply; Apple's symptom chart says the computer "powers on exclusively through softpower on keyboard".[6][10][12] Apple's service manual gives no rail voltages, no tolerances and no adjustment for the supply; its power-related symptom chart entries end in replacing the supply as a module.[12]
The supply is mains-fed. With the cover off and the lead connected, its primary side is at mains potential, and the reservoir capacitor holds a charge after the plug is pulled. Unplug it, discharge the reservoir and confirm with a meter before working on it.
Battery
[edit | edit source]Apple's specification sheet gives the battery as 4.5 V alkaline; Low End Mac and EveryMac agree.[3][5][4] The service manual names no battery part number and no test voltage. Its chart for a machine that is completely dead (fan not running, LED not lit) includes the step "Unplug 4.5 battery, wait 20 seconds, plug in battery, and restart computer"; another entry in the same manual prints "5.4 battery" for the same step.[12] The Macintosh Processor Upgrade procedure has the battery lifted, turned a quarter turn and pressed back in to make room for the upgrade card.[7] Leakage from an alkaline cell is neutralised with a weak acid such as vinegar; see Battery Explosion, Capacitor or Corrosion Damage and Battery Refurbishment.
Capacitors
[edit | edit source]The logic board has nine surface-mount electrolytic capacitors: six 47 µF 16 V and three 100 µF 6.3 V.[8] The positions, the board photograph and the procedure are on Macintosh LC 630 Capacitor Replacement Guide.
Known faults and service notes
[edit | edit source]Apple's symptom charts for the 630 series include several faults specific to this family:[12]
- An eight-tone error chord at startup points to the SIMMs; a four-tone chord to the hard drive or floppy drive, found by disconnecting each and rebooting.
- A crackling noise on sounds other than system beeps is fixed with Audio Volume Extension 1.1 or later.
- Sound distortion with an MPEG card fitted is cured with the modified MPEG board, which has a jumper from U5 pin 2 to D1 pin 1.
- If video will not play with the MPEG card, check the chip at U12: if it reads 341S0205, check the connections; if not, replace the card.
- A Rev. A video-in card (661-0159) that cannot tune some UHF channels is replaced with the Rev. B card (661-1073).
- A rattle at startup on machines with the Apple External Video Connector is the cable touching the fan blades.
- A constantly flashing menu bar or constant beeping means jammed front-panel volume buttons.
Symptom tables and diagnosis are on Macintosh LC 630 Troubleshooting; routine care is on Macintosh LC 630 General Maintenance.
Upgrades
[edit | edit source]The Macintosh Processor Upgrade card (661-0255) carries a PowerPC 601, a 256K cache card and a socket for the machine's own 68LC040, and lets the user switch between the two processors. Apple's procedure places antistatic foam under the processor socket on the underside of the logic board before the card is pressed home, and a late design change says not to fit the 040 heat sink on a 630.[7] Low End Mac notes that the 630 can be clock-chipped to 40 MHz; Apple documents no such modification.[5]
Documentation
[edit | edit source]- LC 630/Quadra 630/Performa 640 Service Source: LC 630/Quadra 630/ Performa 640 Service Source
- Macintosh Performa 630 Series Service Source: Macintosh Performa 630 Series Service Source
- Macintosh LC 630 and Macintosh Quadra 630 Computers Developer Note: Macintosh LC 630 and Quadra 630 Developer Note
Related pages
[edit | edit source]- Macintosh LC 630 General Maintenance
- Macintosh LC 630 Capacitor Replacement Guide
- Macintosh LC 630 Troubleshooting
- Macintosh LC 630 DOS Compatible
- Macintosh Quadra 630
- Macintosh Performa 630
- Macintosh LC 580
References
[edit | edit source]- ↑ 1.0 1.1 Macintosh Quadra 630, Wikipedia—link(accessed 2026-09-30) Model names and markets, introduction dates (Quadra and Performa 18 July 1994, LC 630 3 November 1994, LC 630 DOS Compatible 3 April 1995) and the codename "Crusader", citing Jim Heid, "Multimedia Mac", Macworld September 1994, pp. 98-103, and Pogue and Schorr, Macworld Mac Secrets, 5th ed. (1999), pp. 480-481.
- ↑ 2.0 2.1 2.2 2.3 2.4 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), Specifications chapter, PDF pp. 18-28.
- ↑ 3.0 3.1 3.2 Macintosh LC 630: Technical Specifications, Apple—link(accessed 2026-09-30) Introduced 3 November 1994, discontinued 2 March 1996; 45 W; battery type 4.5 V alkaline; 1 MB DRAM video; 4-36 MB RAM, one 72-pin slot; Gestalt ID 106 for the PowerPC-upgraded configuration the page describes.
- ↑ 4.0 4.1 4.2 Apple Macintosh LC 630 Specs, EveryMac—link(accessed 2026-09-30) Introduced 18 July 1994, discontinued 1 April 1995; order numbers M3305LL/A (4 MB) and M3492LL/A (8 MB); model M3076, Gestalt ID 98; US$1,350 and US$2,080; original system 7.1.2P, supported to Mac OS 8.1; 4.5 V alkaline battery.
- ↑ 5.0 5.1 5.2 5.3 5.4 Performa 630 and LC 630, Low End Mac—link(accessed 2026-09-30)
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Apple Computer, Macintosh LC 630 and Macintosh Quadra 630 Computers Developer Note (1994), File:Macintosh LC 630 and Quadra 630 Developer Note.pdf (see Macintosh LC 630 and Quadra 630 Developer Note), chapter 1, pp. 2-10: summary of features, Table 1-1 comparison with the Quadra 605, Table 1-2 configurations, optional modules and compatibility issues.
- ↑ 7.0 7.1 7.2 Apple Computer, LC 630/Quadra 630/Performa 640 Service Source, File:Quadra.lc 630.performa 640.pdf, Upgrades chapter, PDF pp. 119-139 (Macintosh Processor Upgrade; Power Macintosh 5300/6300 Logic Board Upgrade).
- ↑ 8.0 8.1 Macintosh LC 630, Recap-a-Mac—link(accessed 2026-09-30) Annotated photograph of logic board 820-0548-B, hosted here as File:Mac LC 630 Recap Guide.jpg.
- ↑ 9.0 9.1 9.2 Apple Computer, LC 630/Quadra 630/Performa 640 Service Source, File:Quadra.lc 630.performa 640.pdf, Exploded View, PDF p. 141.
- ↑ 10.0 10.1 10.2 10.3 Apple Computer, Macintosh LC 630 and Macintosh Quadra 630 Computers Developer Note (1994), File:Macintosh LC 630 and Quadra 630 Developer Note.pdf, chapter 2, pp. 12-17: block diagram, microprocessor, custom ICs and display RAM.
- ↑ Apple Computer, LC 630/Quadra 630/Performa 640 Service Source, File:Quadra.lc 630.performa 640.pdf, Basics chapter, PDF pp. 3-16 (general information, IDE, plastic panel design, rear and logic board diagrams).
- ↑ 12.0 12.1 12.2 12.3 12.4 12.5 Apple Computer, LC 630/Quadra 630/Performa 640 Service Source, File:Quadra.lc 630.performa 640.pdf, Troubleshooting chapter, symptom charts, PDF pp. 31-49.
- ↑ Apple Computer, Macintosh LC 630 and Macintosh Quadra 630 Computers Developer Note (1994), File:Macintosh LC 630 and Quadra 630 Developer Note.pdf, chapter 4, p. 54, Table 4-6 "Power available for the expansion card".
- ↑ Apple Computer, LC 630/Quadra 630/Performa 640 Service Source, File:Quadra.lc 630.performa 640.pdf, Take Apart chapter, PDF pp. 51-117 (Logic Board, DOS Compat. Logic Board, Shield/Wiring Harness, Fan/Video Card Bracket, Power Supply).
