42
A
A
X
X
4
4
T
T
I
I
I
I
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 others USB connectors to the back plane or
front panel of chassis.
Pin 1
NC
GND
SBD3+
SBD3-
+5V
KEY
GND
SBD2+
SBD2-
+5V
1
