Hard Disk Cable ConnectorsPin Signal Name I/O Pin Signal Name I/O1 Host Reset O 21 No Connection2 Ground 22 Ground3 Host Data 7 I/O 23 Host IOW O4 Host Data 8 I/O 24 Ground Power5 Host Data 6 I/O 25 Host IOR O6 Host Data 9 I/O 26 Ground Power7 Host Data 5 I/O 27 I/O Channel Ready I8 Host Data 10 I/O 28 No Connection9 Host Data 4 I/O 29 No Connection10 Host Data 11 I/O 30 Ground Power11 Host Data 3 I/O 31 Host IRQ I12 Host Data 12 I/O 32 No Connection13 Host Data 2 I/O 33 Host A1 O14 Host Data 13 I/O 34 No Connection15 Host Data 1 I/O 35 Host A0 O16 Host Data 14 I/O 36 Host A2 O17 Host Data 0 I/O 37 Host CS0 O18 Host Data 15 I/O 38 Host CS1 O19 Ground Power 39ACTIVE I20 No Connection 40 Ground PowerParts/Test Point Locations 5-21

IBM Aptiva 2159 Manual