Apple PowerBook ATA

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Image:connector_apple_ata_48p.png 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.

Pin Name Dir Description
1 /RESET OUT Reset
2 GND - Ground
3 DD7 IN/OUT Data 7
4 DD8 IN/OUT Data 8
5 DD6 IN/OUT Data 6
6 DD9 IN/OUT Data 9
7 DD5 IN/OUT Data 5
8 DD10 IN/OUT Data 10
9 DD4 IN/OUT Data 4
10 DD11 IN/OUT Data 11
11 DD3 IN/OUT Data 3
12 DD12 IN/OUT Data 12
13 DD2 IN/OUT Data 2
14 DD13 IN/OUT Data 13
15 DD1 IN/OUT Data 1
16 DD14 IN/OUT Data 14
17 DD0 IN/OUT Data 0
18 DD15 IN/OUT Data 15
19 GND - Ground
20 KEY - Key (Pin missing)
21 DMARQ ? DMA Request
22 GND - Ground
23 /DIOW, /STOP OUT Write Strobe
24 GND - Ground
26 GND - Ground
28 CSEL ?
29 /DMACK ? DMA Acknowledge
30 GND - Ground
31 INTRQ IN Interrupt Request
32 /IOCS16 ? obsolete, not used
33 /DA1 OUT Address 1
34 /PDIAG, /CBLID ? Passed Diagnostics
35 /DA0 OUT Address 0
36 /DA2 OUT Address 2
37 /CS0 OUT
38 /CS1 OUT
40 GND - Ground
41 +5V LOGIC
42 +5V MOTOR
43 GND Ground
44 Reserved


  • /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.


Category:Data Storage Connectors


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