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> Power Macintosh G3 Developer Note
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The Power Macintosh G3 computer has an Ultra DMA/33 (ATA/ATAPI-4) interface and an ATA-3 interface for internal mass storage and removable media devices. The enclosure includes data and power connectors for the boot drive on the Ultra DMA/33 interface. It also includes data and power connectors for an optional internal ATAPI CD-ROM or DVD-ROM drive and an internal ATAPI ZIP drive. Those drives are connected to the ATA-3 interface.
The enclosure also includes two additional drive bays for other mass storage devices connected to an optional or user-installed controller card in a PCI slot. None of the drive bays can be modified to support removable drive bay kits. The locations of the drive bays are shown in Figure 1-4 .
The Ultra DMA/33 bus supports PIO Mode 4, DMA Mode 2, and Ultra DMA Mode 2 data transfers. The ATA-3 bus supports PIO Mode 4 and DMA Mode 2 data transfers.
The ATA-3 channel supports two ATA devices. The devices are configured in a ATA Device 0/1 configuration. The ATAPI CD or DVD-ROM and Zip drive, when installed, occupy both device locations on the ATA-3 channel. The ATAPI CD or DVD-ROM, depending on which is installed, is Device 0 (master), and the Zip drive is Device 1 (slave). If the Zip drive is not factory installed in the system, a power and data cable is available for adding a Zip drive to the ATA-3 bus in the Zip drive bay. The device has to be device-select jumpered as Device 1 (slave).
The Power Macintosh G3 computer does not include a 1.44 MB floppy drive.
Ultra DMA/33 Hard Disk DriveOptional Ultra2 SCSI (LVD) Drive
