ASROCK AD2550-ITX User Manual page 22

Print Port Header
(25-pin LPT1)
(see p.11 No. 1)
Serial port Header
(9-pin COM1)
(see p.11 No. 2)
AFD#
ERROR#
PINIT#
GND
SLIN#
1
SPD7
SPD6
ACK#
SPD5
SPD4
SPD3
SPD2
SPD1
SPD0
STB#
22
This is an interface for print
port cable that allows
convenient connection of printer
devices.
BUSY
PE
SLCT
This COM1 header supports a
serial port module.