EIDE or AT-Bus (40pin SQP)

Pin Signal Pin Signal

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Most signals are identical

1 - /RESET 2 - GND with the ISA BUS signals.

3 - DATA7 4 - DATA8 A2-A0 lowest 3 addresslines

5 - DATA6 6 - DATA9 /CS0 active on IO @ 1F0-1F7

7 - DATA5 8 - DATA10 /CS1 active on IO @ 3F0-3F7

9 - DATA4 10 - DATA11 SPSYNC spindle sync, older

11 - DATA3 12 - DATA12 cards have ALE instead

13 - DATA2 14 - DATA13 /IOCS16 is 16 bit select

15 - DATA1 16 - DATA14 DRQ is a DRQ#, DACK a DACK#

17 - DATA0 18 - DATA15 /PDIAG selftest indicator

19 - GND 20 - GND from slave to master HD

21 - DRQ 22 - GND /DASP disk activity/slave

23 - /IOWR 24 - GND normal = activity

25 - /IORD 26 - GND after RESET = slave pres.

27 - IOCHRDY 28 - SPSYNC

29 - /DACK 30 - GND

31 - IRQ14 32 - /IOCS16

33 - A1 34 - /PDIAG

35 - A0 36 - A2

37 - /CS0 38 - /CS1

39 - /DASP 40 - GND