The Apple Macintosh Performa 638CD features a 33 MHz 68LC040 processor, 8 MB of RAM, a 350 MB hard drive, a 2X CD-ROM drive, and TV/Video functionality in a compact desktop case.

The Performa 638CD is identical to the Performa 637CD, but the 638CD shipped with TV and video input/output cards and without a monitor.

The educational version of the Performa 638CD is the LC 630 series and the business version is the Quadra 630.

• Tech Specs
• Ports

Click on the category for related details. The most commonly needed info is "open" by default, but all info is important.

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Introduction Date:

July 18, 1994

Discontinued Date:

July 1, 1995

Details:

The "Introduction Date" refers to the date a model was introduced via press release. The "Discontinued Date" refers to the date a model either was replaced by a subsequent system or production otherwise ended. Also see: All Macs introduced in 1994.

Processor Speed:

33 MHz*

Processor Type:

68LC040

Details:

*This model has a 32-bit processor and a 32-bit data path. Sometimes this model is designated as having a 66 MHz processor, since the clock input runs at 66 MHz. However, the processor itself is not "clock doubled," so technically it only is a 33 MHz processor.

Processor Upgrade:

N/A

FPU:

None

Details:

N/A

System Bus Speed:

33 MHz

Cache Bus Speed:

N/A

Details:

N/A

ROM Type:

Macintosh ROM

ROM Size:

1 MB

Details:

N/A

L1 Cache:

8k

L2 Cache:

N/A

Details:

N/A

RAM Type:

72-pin SIMM

Min. RAM Speed:

80 ns

Details:

N/A

Standard RAM:

8 MB

Maximum RAM:

36 MB

Details:

This model can be upgraded to 36 MB of RAM with a single 32 MB SIMM. Also see: Actual Max RAM of All G3 & Later Macs.

Motherboard RAM:

4 MB

RAM Slots:

1

Details:

N/A

Video Card:

Dedicated*

VRAM Type:

Onboard*

Details:

*1 MB of onboard 60 ns DRAM is dedicated to video function.

Standard VRAM:

1 MB

Maximum VRAM:

1 MB

Details:

The onboard VRAM cannot be upgraded.

Display Support:

Single Display*

Resolution Support:

640x480*

Details:

*By default, this model only supports a single display, but a second one can be supported with the addition of an LC PDS video card. With the internal VRAM, the system is capable of supporting 512x384 and 640x480 at 16-bit color and 800x600 and 832x624 at 8-bit color.

2nd Display Support:

Single Display*

2nd Max. Resolution:

Variable*

Details:

*This model can support a second display with the addition of an LC PDS video card. By default, it only supports a single display.

Standard Hard Drive:

350 MB

Int. HD Interface:

IDE

Details:

By default, this model is configured with a 350 MB internal IDE hard drive. It does not support an internal SCSI hard drive.

Standard Optical:

2X CD-ROM

Standard Disk:

1.44 MB (Manual)

Details:

N/A

Standard Modem:

14.4k (External)

Standard Ethernet:

None

Details:

N/A

Expansion Slots:

1 LC PDS, Comm, Video I/O, TV*

Expansion Bays:

None

Details:

*This model has a single LC PDS, Comm, TV, and both video input and video output expansion slots. It shipped with pre-installed TV and video input/output cards.

Case Type:

Desktop

Form Factor:

Macintosh Quadra 630

Details:

N/A

Apple Order No:

M3599LL/A

Apple Subfamily:

Mac Performa 638CD

Details:

N/A

Apple Model No:

M3076

Gestalt ID:

98

Details:

Please note that these identifiers commonly refer to multiple models. Also see: All Macs with the M3076 Model Number and 98 Gestalt ID. For more about identifiers and how to locate them on modern Macs, please refer to EveryMac.com's Mac Identification section.

Battery Type:

4.5V Alkaline

Battery Life:

N/A

Details:

N/A

Original Mac OS:

7.1.2P

Supported Mac OS:

7.1.2P-7.5.1, 7.5.3-8.1

Details:

Earlier and later versions of the Macintosh System/Finder and Mac OS are not supported.

Dimensions:

4.3 x 12.6 x 16.5

Avg. Weight:

19.0 lbs (8.6 kg)

Details:

In inches - height by width by depth, (10.9 cm, 32 cm, 41.9 cm).

Original Price (US):

US$2300

Est. Current Retail:

N/A

Details:

Photo Credit: Apple Computer, Inc.

Click on a category for additional details. The most commonly needed info is "open" by default, but all info is important. The icons correspond with the icons for each port on the computer.

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Video (Monitor):

1 (DB-15)

Floppy (Ext.):

None

Details:

N/A

ADB:

1

SCSI:

1 (DB-25)

Details:

N/A

Serial (Standard):

2

Serial (Geoport):

None

Details:

Serial ports are marked by printer and modem icons.

Modem:

1 (RJ-11)*

Ethernet:

None*

Details:

*By default, an external 14.4k modem was provided. An optional internal 14.4k modem and AAUI-15 Ethernet card also were available.

S-Video Input:

1*

S-Video Output:

1*

Details:

*S-video input/output were provided courtesy of a pre-installed expansion card as was a TV tuner.

Microphone:

1 (PlainTalk)

Sound In:

None

Details:

N/A

Sound Out:

1 (8-Bit Stereo)

Headphone:

1 (Front-Mounted)

Details:

N/A

Security (Lock):

1

Joystick (PC):

None

Details:

N/A

Power:

1

Power Adapter:

N/A

Details:

100V-240V AC, 50-60 Hz Frequency, 45 Max Watts. Icon Credit: Apple Computer, Inc.

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