Editing Macintosh Quadra 630

{{Infobox computer
| name         = Macintosh Quadra 630
| image        = [[File:Macintosh_LC_630.jpg|250px]]
| caption      = Macintosh Quadra 630
| manufacturer = Apple Computer, Inc.
| type         = Personal Computer
| release date = July 18, 1994
| discontinued = April 1995
| price        = US$1,199
| cpu          = Motorola 68LC040 @ 33 MHz
| memory       = 4 MB RAM soldered (expandable to 36 MB)
| storage      = 250 MB IDE hard drive; optional internal CD-ROM
| display      = 512×384 or 640×480 (16-bit), supports up to 832×624 (8-bit)
| sound        = 16-bit stereo input/output; Apple Sound Chip
| dimensions   = 4.3" H × 16.5" W × 12.6" D
| weight       = 17.0 lbs (7.7 kg)
| os           = System 7.1.2 – Mac OS 8.1
| predecessor  = [[Macintosh Quadra 610]]
| successor    = [[Power Macintosh 6200]]
| codename     = Crusader
| model        = M3076
}}

The '''Macintosh Quadra 630''' is a desktop computer released by Apple Computer on July 18, 1994.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_630.html |title=Macintosh Quadra 630 Specs |publisher=EveryMac.com |access-date=2026-02-10}}</ref> It was the first Quadra to use an IDE hard drive interface rather than SCSI, and the last Macintosh to carry the Quadra name.<ref>{{cite web |url=https://lowendmac.com/1994/macintosh-quadra-630/ |title=Macintosh Quadra 630 |publisher=Low End Mac |access-date=2026-02-10}}</ref> The Quadra 630 shares its case design and logic board with the [[Macintosh LC 630]] and [[Macintosh Performa 630]] series.

== Model Variants ==

The Quadra 630 shares its hardware platform with several other models:

* '''[[Macintosh LC 630]]''' — Education/developer market
* '''[[Macintosh LC 630 DOS Compatible]]''' — With 486DX2/66 DOS card
* '''[[Macintosh Performa 630]]''' series (630, 631CD, 635CD, 636, 637CD, 638CD) — Consumer market

All models use the same logic board and case. The Quadra 630 was positioned as the professional variant, though it used the same 68LC040 processor without FPU as the other 630 models.<ref>{{cite web |url=https://www.apple-history.com/630 |title=Macintosh Quadra 630 |publisher=Apple-History.com |access-date=2026-02-10}}</ref>

== Architecture and Processor ==

The Quadra 630 is powered by a Motorola 68LC040 processor running at 33 MHz. The "LC" designation indicates the absence of a floating-point unit (FPU).<ref>{{cite web |url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_630.html |title=Macintosh Quadra 630 Specs |publisher=EveryMac.com |access-date=2026-02-10}}</ref> A full 68040 processor with FPU can be installed as a replacement.

The system uses a 32-bit data bus and 32-bit address bus with 8 KB of on-chip cache (4 KB instruction, 4 KB data).

== Memory and Storage ==

=== RAM Configuration ===

The Quadra 630 has 4 MB of RAM soldered directly to the logic board. A single 72-pin SIMM slot accepts modules up to 32 MB, for a maximum of 36 MB total RAM.<ref>{{cite web |url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_630.html |title=Macintosh Quadra 630 Specs |publisher=EveryMac.com |access-date=2026-02-10}}</ref>

Supported SIMM speeds: 80ns or faster. The system supports 4, 8, 16, or 32 MB SIMMs.

=== ROM and System Software ===

The Quadra 630 contains a 1 MB ROM. It shipped with System 7.1.2 and supports up to Mac OS 8.1.

=== Storage Systems ===

The Quadra 630 was the first Quadra to use IDE (ATA) for its internal hard drive, departing from the SCSI standard used in previous Quadras. The base configuration included a 250 MB IDE drive.

An internal expansion bay accommodates either a second hard drive, a CD-ROM drive, or an optional Apple TV/Video System card with analog video input.<ref>{{cite web |url=https://lowendmac.com/1994/macintosh-quadra-630/ |title=Macintosh Quadra 630 |publisher=Low End Mac |access-date=2026-02-10}}</ref>

== Display and Graphics ==

Video output is provided by an integrated graphics controller supporting:

* 512×384 at 16-bit color (thousands of colors)
* 640×480 at 16-bit color
* 832×624 at 8-bit color (256 colors)

Video memory: 1 MB DRAM (VRAM expandable via 256 KB VRAM SIMM to support higher resolutions and color depths).

The system includes a video-out port compatible with standard Apple monitors. An optional video-in card allowed capture of analog video and still images.

== Audio Capabilities ==

The Quadra 630 features 16-bit stereo sound input and output through the Apple Sound Chip (ASC). Audio ports include:

* 3.5mm stereo output jack
* 3.5mm mono microphone input
* Internal speaker

== Input/Output and Expansion ==

=== Port Configuration ===

* ADB ports × 2 (keyboard/mouse)
* Serial ports × 2 (GeoPort compatible)
* SCSI-1 port (external devices only; internal drives use IDE)
* Video output (DB-15)
* Audio in/out (3.5mm)
* Ethernet (optional via Comm Slot)

=== Expansion Options ===

* '''Comm Slot''' — Accepts Ethernet or modem cards
* '''LC PDS Slot''' — Processor Direct Slot for expansion cards
* '''Video-In Card''' — Optional analog video capture
* '''TV Tuner''' — Optional television tuner card

== General Maintenance ==

For detailed maintenance practices including cleaning, PRAM battery management, connector corrosion prevention, and voltage adjustments, refer to the dedicated [[Macintosh LC 630 General Maintenance]] page.

== PCB Schematics & Service Manual ==

The Macintosh Quadra 630 shares its logic board with the LC 630 and Performa 630 series. Service documentation applies to all 630-series models.

=== Apple Service Manual ===

All Apple Service Manuals can be found on the [[:Category:Apple Service Source|Apple Service Source]] page.

== Capacitor Replacement Guide ==

Detailed capacitor replacement guidelines for the logic board can be found on the [[Macintosh LC 630 Capacitor Replacement Guide]] page. The Quadra 630 uses the same logic board as other 630-series Macintoshes.

== Retrobrite ==

To address plastic yellowing, detailed instructions can be found on the [[Retrobrite]] page.

== Troubleshooting ==

A comprehensive troubleshooting guide addressing common issues is available on the [[Macintosh LC 630 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 Quadra 630, 1994)
|-
| '''CPU''' || Motorola 68LC040 @ 33 MHz (no FPU)
|-
| '''Bus width''' || 32-bit data • 32-bit address
|-
| '''ROM''' || 1 MB
|-
| '''RAM''' || 4 MB soldered + 1 SIMM slot (max 36 MB)
|-
| '''Video''' || 640×480 16-bit, 832×624 8-bit
|-
| '''VRAM''' || 1 MB (expandable to 1.25 MB)
|-
| '''Sound''' || 16-bit stereo, Apple Sound Chip
|-
| '''Storage''' || IDE hard drive, optional CD-ROM
|-
| '''Ports''' || ADB ×2, Serial ×2, SCSI (ext), Video, Audio
|}

=== Processor Specifications ===

{| class="wikitable styled-table"
|-
! Component !! Specification
|-
| CPU || Motorola 68LC040 @ 33 MHz<ref>{{cite web |url=https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_630.html |title=Macintosh Quadra 630 Specs |publisher=EveryMac.com |access-date=2026-02-10}}</ref>
|-
| FPU || None (LC variant)
|-
| L1 Cache || 8 KB (4 KB I + 4 KB D)
|-
| Data Bus || 32-bit
|-
| Address Bus || 32-bit
|}

== Service Documentation ==

The official Apple Service Source documentation for this model:

<pdf width="800" height="500">File:Quadra.lc_630.performa_640.pdf</pdf>

== See Also ==

* [[Macintosh LC 630]]
* [[Macintosh Performa 630]]
* [[Macintosh Quadra 610]]

== References ==

<references />

[[Category:Apple Vintage Computers]]
[[Category:Macintosh Quadra]]