HP dc7900 - Convertible Minitower PC

J42
J50
J51
J52
J53
PCI Express x4 graphics slot
First parallel port
Second parallel port
Double-stacked parallel port, Top = Port B, Bottom = Port A
Parallel port over single Serial Port
J54
J55
J64
J65
J66
J67
Parallel port over Serial Port and Video Port
Parallel port over dual VGA ports
Display port connector
DVI connector
Keyboard connector, PS/2 (Closest to power supply)
Mouse connector, PS/2
J68
J69
J70
J71
J72
Stacked mouse (Top)/keyboard (Bottom) connector
Video connector, VGA
Primary single USB connector
Secondary single USB port
Microphone jack
J73
J74
J75
J76
J77
Line-in jack
Line-out jack
Headphone jack
Volume control
Double-stacked headphone (Bottom)/microphone (Top) connector
J78
J80
J81
J82
J83
J101
Double-stacked line-in (Top)/line-out (Bottom) connector
Stacked serial/audio connector
Primary double-stack USB, Top = Port 2, Bottom = Port 1
Secondary double-stack USB, Top = Port 4, Bottom = Port 3
Triple-stacked audio jack (line in, line out/headphone, microphone)
Security board connector - for security card
J103
J105
J9020-J9029
J9030-J9034
JP49/E49
L1
DC input power
PCI Express MiniCard
PCI slots on riser card
PCI express slots on riser card
Clear password header/jumper
USB front port choke (1st)
L2 USB rear port choke (1st)
274 Appendix E System Board and Riser Board Reference Designators