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Apple Computer, Inc.
By Fred Widmer
This article describes the Integrated Drive Electronics (IDE ) hard drive, the 40-pin IDE connector pinouts, and IDE signals currently used on the following computers:
Macintosh 630 Family computers**
Macintosh LC 580
Macintosh Performa 5200 series computers
Macintosh Performa 5300 series computers
Macintosh Performa 6200 series computers
Macintosh Performa 6300 series computers
Macintosh PowerBook 150 series computers
Macintosh PowerBook 190 series computers
Macintosh PowerBook 2300 series computers
Macintosh PowerBook 5300 series computers
Power Macintosh 5200/75 LC
Power Macintosh 5300/100 LC
**The Macintosh 630 Family includes the following computers: Macintosh LC 630, Quadra 630, and Performa 630, Performa 635, Performa 636, Performa 637, Performa 638 and Performa 640.
The computers mentioned above all have an internal hard disk using the IDE interface. This cost-effective interface, used on IBM AT-compatible computers, is also referred to as the ATA interface. The implementation of the ATA interface on the Macintosh LC 630 and Macintosh Quadra 630 computers is a subset of the ATA interface specification, ANSI proposal X3T9.2/90-143, Revision 3.1.
An IDE drive does not have any address conflicts, specific cabling, or termination issues normally found in a SCSI chain. Performance of an IDE hard drive will be similar to a comparable SCSI hard drive.
Any hard drive utilities you may have for SCSI drives will likely have to be revised to function properly with an IDE drive. Check with the vendor of the utility for compatibility information.
Hard Disk ConnectorsThe internal hard disk has a standard 40-pin IDE connector and a separate 4-pin power connector. The 40-pin connector cable is part of the cable harness attached to the main logic board by the internal chassis connector. The power cable is attached directly to the power supply.
Pin AssignmentsThe Table below shows the pin assignments on the 40-pin IDE hard disk connector. A slash (/) at the beginning of a signal name indicates an active-low signal.
Note: The IDE data bus is connected to the I/O bus through bidirectional bus buffers. To match the big-endian format of the MC68030-compatible bus, the bytes are swapped. The lower byte of the IDE data bus, DD(0-7), is connected to the high byte of the upper word of the I/O bus, IOD(24-31). The higher byte of the IDE data bus, DD(8-15), is connected to the low byte of the upper word of the I/O bus, IOD(16-23).
The Table below describes the signals on the IDE hard disk connector.
IDE Signal Descriptions
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