Chapter 5 Installation
AI5TT Pentium Baby AT Motherboard User
’
s Manual
23
5.5 J7, J6: Serial Ports
The onboard serial ports of the AI5TT are 10 pin-header connectors. J7 is
COM1 and J6 is COM2. The following table shows the pin out of the
these connectors.
Pin #
Signal Name
1
DCD, Data carrier detect
2
RXD, Receive data
3
TXD, Transmit data
4
DTR, Data terminal ready
5 GND,
ground
6
DSR, Data set ready
7
RTS, Request to send
8
CTS, Clear to send
9
RI, Ring indicator
10 Not
Used
5.6 J8: Parallel Port Connector
The following table describes the pin out assignments of this connector.
Signal Name
Pin #
Pin #
Signal Name
Line printer strobe
1
14
AutoFeed
PD0, parallel data 0
2
15
Error
PD1, parallel data 1
3
16
Initialize
PD2, parallel data 2
4
17
Select
PD3, parallel data 3
5
18
Ground
PD4, parallel data 4
6
19
Ground
PD5, parallel data 5
7
20
Ground
PD6, parallel data 6
8
21
Ground
PD7, parallel data 7
9
22
Ground
ACK, acknowledge
10
23
Ground
Busy 11
24
Ground
Paper empty
12
25
Ground
Select 13
N/A
N/A
