M
M
X
X
3
3
4
4
-
-
U
U
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
S
S
u
u
p
p
p
p
o
o
r
r
t
t
2
2
n
n
d
d
U
U
S
S
B
B
P
P
o
o
r
r
t
t
This motherboard provides 4
USB
connectors to connect USB devices, such as mouse, keyboard, modem, printer, etc. There
are two connectors on the PC99 back panel. You can use proper cable to connect other USB connectors to the back panel or
front panel of chassis.
Pin 1
1
+5V
SBD2-
SBD2+
GND
KEY
+5V
SBD3-
SBD3+
GND
NC
U
U
S
S
B
B
2
2
C
C
o
o
n
n
n
n
e
e
c
c
t
t
o
o
r
r
45
