HP dc7900 - Convertible Minitower PC

CD-ROM 50-Pin Connector
Connector
Pin Signal Pin Signal Pin Signal Pin Signal
1
2
3
4
Audio L-ch
Audio R-ch
Audio GND
GND
14
15
16
17
DD12
DD3
DD13
DD2
27
28
29
30
IORDY
DMACK
INTRQ
IOCS16
40
41
42
43
+5V
+5V
+5V
GND
5
6
7
8
RESET
DD8
DD7
DD9
18
19
20
21
DD14
DD1
DD15
DD0
31
32
33
34
DA1
PDIAG
DA0
DA2
44
45
46
47
GND
GND
GND
CSEL
9
10
11
12
13
DD6
DD10
DD5
DD11
DD4
22
23
24
25
26
DMARQ
GND
DIOR
DIOW
GND
35
36
37
38
39
CS1FX
CS3FX
DASP
+5V
+5V
48
49
50
GND
Vendor-specific
Vendor-specific
24-Pin Power
Connector
24
12
13
1
Front
Pin Signal Pin Signal Pin Signal Pin Signal
1
2
3
4
5
6
+3.3V
+3.3V
GND
+5V
GND
+5V
7
8
9
10
11
12
GND
POK
+5 Vaux
+12V
+12V
+3.3V
13
14
15
16
17
18
+3.3V
–12V
GND
PSON
GND
GND
19
20
21
22
23
24
GND
open
+5V
+5V
+5V
GND
218 Appendix A Connector Pin Assignments