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Image Credit: Macworld,
November 1994
Introduced: July 1, 1994
Logic Board Processor:
68LC040 Processor Speed:
33 MHz Note:
This model is sometimes designated as having
a 66 MHz processor,since the clock input runs at 66 MHz; however,
the processor itself runs at 33 MHz.
PMMU:
Integrated FPU:
none Bus Speed:
33 MHz Data Path:
32-bit ROM Size:
1 MB Level 1 Cache:
8K Level 2 Cache:
none Expansion Slots:
LC, comm., TV, video in Battery:
4.5V Alkaline Memory RAM Type:
72-pin SIMM RAM Slots:
1 Min - Max RAM:
8 MB - 36 MB Minimum RAM Speed:
80 ns Install in groups of:
1 RAM Sizes:
1, 2, 4, 8, 16, 32 MB Onboard RAM:
4 MB Ports ADB:
1 USB:
none FireWire:
none Video:
DB-15 Floppy:
none SCSI:
DB-25 Geoports:
none Ethernet:
none Mic Type:
PlainTalk Other ports:
Printer, modem, speaker, headphone,
remote control Video Standard DRAM:
1 MB (Built-in) Maximum DRAM:
1 MB (Built-in) Display Resolution:
512 x 384, 16-bit 640 x 480, 16-bit 800 x 600, 8-bit 832 x 624, 8-bit
Storage Standard CD-ROM:
2x Internal Hard Drive:
IDE (350 MB) Floppy Disk Drive:
1.44 MB manual Image Credit: Apple,
Inc. Operating System Addressing Modes:
32-bit Original OS:
7.1.2P Original Enabler:
System Enabler 405 AppleTalk Version:
57.0.4 Compatible MacOS:
7.1.2P Miscellaneous Macintosh Counterpart:
Quadra 630 Form Factor:
Quadra 630 Dimensions (Inches):
4.3 H x 12.6 W x 16.5 D Average Weight (lbs):
19 Gestalt ID:
98 Original Price:
$2300 US Comments
The Performa 638CD was identical to the Performa 637CD, but shipped with a TV/Video card
and without a monitor.
