Compaq dc7800 Service Reference Guide - HP Compaq dc7800 Business PC - Page 209
CD-ROM 50-Pin Connector, 24-Pin Power
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CD-ROM 50-Pin Connector Connector Pin Signal 1 Audio L-ch 2 Audio R-ch 3 Audio GND 4 GND 5 RESET 6 DD8 7 DD7 8 DD9 9 DD6 10 DD10 11 DD5 12 DD11 13 DD4 24-Pin Power Connector 24 12 Pin Signal 1 +3.3V 2 +3.3V 3 GND 4 +5V 5 GND 6 +5V Pin Signal 14 DD12 15 DD3 16 DD13 17 DD2 18 DD14 19 DD1 20 DD15 21 DD0 22 DMARQ 23 GND 24 DIOR 25 DIOW 26 GND Pin Signal 27 IORDY 28 DMACK 29 INTRQ 30 IOCS16 31 DA1 32 PDIAG 33 DA0 34 DA2 35 CS1FX 36 CS3FX 37 DASP 38 +5V 39 +5V 13 1 Pin Signal 7 GND 8 POK 9 +5 Vaux 10 +12V 11 +12V 12 +3.3V Front Pin Signal 13 +3.3V 14 -12V 15 GND 16 PSON 17 GND 18 GND Pin Signal 40 +5V 41 +5V 42 +5V 43 GND 44 GND 45 GND 46 GND 47 CSEL 48 GND 49 Vendor-specific 50 Vendor-specific Pin Signal 19 GND 20 open 21 +5V 22 +5V 23 +5V 24 GND CD-ROM 50-Pin Connector 197