Compaq dx7400 Service Reference Guide - HP Compaq dx7400 Business PC - Page 134
Diskette Drive Standard Data Cable, 24-Pin Power
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Diskette Drive Standard Data Cable Connector 2 34 1 Pin Signal 1 Ground 2 Low density 3 Key 4 Media - ID 5 Ground 6 No Signal 7 Ground 8 Index 9 Ground 10 Reserved 11 Ground 12 Drive Select 33 Pin Signal 13 Ground 14 Reserved 15 Ground 16 Motor On 17 Ground 18 Direction In 19 Ground 20 Step 21 Ground 22 Write data 23 Ground 24 Write Gate Pin Signal 25 Ground 26 Track 00 27 Ground 28 Write Protect 29 Ground 30 Read Data 31 Ground 32 Side 1 Select 33 Ground 34 Disk Change 24-Pin Power Connector 24 12 Pin Signal 1 +3.3V 2 +3.3V 3 GND 4 +5V 5 GND 6 +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 19 GND 20 open 21 +5V 22 +5V 23 +5V 24 GND 124 Appendix A Connector Pin Assignments