HP Dc7700 HP Compaq dx7300 and dc7700 Business PC Technical Reference Guide, 1 - Page 103
USB Connector, USB Control
UPC - 882780715318
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Input/Output Interfaces USB Control The USB is controlled through I/O registers as listed in table 5-19. Table 5-19. USB Control Registers I/O Address Register 00, 01h Command 02, 03h Status 04, 05h Interupt Enable 06, 07 Frame Number 08, 0B Frame List Base Address 0Ch Start of Frame Modify 10, 11h Port 1 Status/Control 12, 13h Port 2 Status/Control 18h Test Data Default Value 0000h 0000h 0000h 0000h 0000h 40h 0080h 0080h 00h 5.7.3 USB Connector These systems provide type-A USB ports as shown in Figure 5-9 below. 1 2 3 4 Figure 5-9. Universal Serial Bus Connector (as viewed from rear of chassis) Table 5-20. USB Connector Pinout Pin Signal Description Pin Signal Description 1 Vcc +5 VDC 3 USB+ Data (plus) 2 USB- Data (minus) 4 GND Ground Technical Reference Guide www.hp.com 5-25