48 pin Apple ATA connector at the Apple computer.
This connector is used on PowerBooks for the 2.5” drives. The internal hard disk has a 48-pin connector that carries both the ATA signals and the power for the drive.
|20||KEY||-||Key (Pin missing)|
|23||/DIOW, /STOP||OUT||Write Strobe|
|25||/DIOR, /HDMARDY, HSTROBE||OUT|
|27||IORDY, /DDMARDY, DSTROBE||IN||I/O Ready,…|
|32||/IOCS16||?||obsolete, not used|
|34||/PDIAG, /CBLID||?||Passed Diagnostics|
- /DA(0–2) Device address; used by the computer to select one of the registers in the ATA drive. For more information, see the descriptions of the CS0 and CS1 signals.
- DD(0–15) Data bus; buffered from IOD(16–31) of the computer’s I/O bus. DD(0–15) are used to transfer 16-bit data to and from the drive buffer. DD(8–15) are used to transfer data to and from the internal registers of the drive, with DD(0–7) driven high when writing.
- /CBLID The host checks this signal after Power On or hardware reset to detect whether an 80-conductor cable is present.
- /CS0 Register select signal. It is asserted low to select the main task file registers. The task file registers indicate the command, the sector address, and the sector count.
- /CS1 Register select signal. It is asserted low to select the additional control and status registers on the ATA drive.
- CSEL Cable select; not available on the iBook.
- /DASP Device active or slave present; not available on the iBook.
- /DDMARDY Drive ready to receive Ultra DMA data.
- /DIOR I/O data read strobe.
- /DIOW I/O data write strobe.
- /DMACK Used by the host to initiate a DMA transfer in response to DMARQ.
- DSTROBE Strobe for Ultra DMA data transfers to host.
- /HDMARDY Ultra DMA data ready.
- HSTROBE Strobe for Ultra DMA data transfers from host.
- IORDY I/O ready; when driven low by the drive, signals the CPU to insert wait states into the I/O read or write cycles.
- /IOCS16 I/O channel select; not used on this computer (pulled low by 1 kilohm resistor).
- DMARQ Asserted by the device when it is ready to transfer data to or from the host.
- INTRQ Interrupt request. This active high signal is used to inform the computer that a data transfer is requested or that a command has terminated.
- /PDIAG Asserted by device 1 to indicate to device 0 that it has completed the power-on diagnostics; not available on the iBook.
- /RESET Hardware reset to the drive; an active low signal.
- /STOP Stop request; an active low signal.
- Key This pin is the key for the connector.