Compaq DC7600 HP Compaq dx 7200 and dc7600 Personal Computers, Technical Refer - Page 84

Input/Output Interfaces Table 5-3. 40-Pin IDE (PATA) Connector Pinout Pin Signal Description Pin Signal Description 1 RESET- Reset 21 DRQ DMA Request 2 GND Ground 22 GND Ground 3 DD7 Data Bit 23 IOW- I/O Write [1] 4 DD8 Data Bit 24 GND Ground 5 DD6 Data Bit 25 IOR- I/O Read [2] 6 DD9 Data Bit 26 GND Ground 7 DD5 Data Bit 27 IORDY I/O Channel Ready [3] 8 DD10 Data Bit 28 CSEL Cable Select 9 DD4 Data Bit 29 DAK- DMA Acknowledge 10 DD11 Data Bit 30 GND Ground 11 DD3 Data Bit 31 IRQn Interrupt Request [4] 12 DD12 Data Bit 32 IO16- 16-bit I/O 13 DD2 Data Bit 33 DA1 Address 1 14 DD13 Data Bit 34 DSKPDIAG Pass Diagnostics 15 DD1 Data Bit 35 DA0 Address 0 16 DD14 Data Bit 36 DA2 Address 2 17 DD0 Data Bit 37 CS0- Chip Select 18 DD15 Data Bit 38 CS1- Chip Select 19 GND Ground 39 HDACTIVE- Drive Active (front panel LED) [5] 20 -- Key 40 GND Ground NOTES: [1] On UATA/33 and higher modes, re-defined as STOP. [2] On UATA/33 and higher mode reads, re-defined as DMARDY-. On UATA/33 and higher mode writes, re-defined as STROBE. [3] On UATA/33 and higher mode reads, re-defined as STROBE-. On UATA/33 and higher mode writes, re-defined as DMARDY-. [4] Primary connector wired to IRQ14, secondary connector wired to IRQ15. [5] Pin 39 is used for spindle sync and drive activity (becomes SPSYNC/DACT-) when synchronous drives are connected. 5-4 www.hp.com Technical Reference Guide