Chapter 5 Installation
20
TI7NBA Socket 370 ATX Motherboard User’s Manual
5.3 J1, J2: Serial Ports
The onboard serial ports of the TI7NBA, J1 and J2, are two DB-9
external connectors. The following table shows the pin-out assignments
of these connectors.
Signal Name
Pin #
Pin #
Signal Name
DCD, Data carrier detect
1
6
DSR, Data set ready
RXD, Receive data
2
7
RTS, Request to send
TXD, Transmit data
3
8
CTS, Clear to send
DTR, Data terminal ready
4
9
RI, Ring indicator
GND, ground
5
10
Not Used
J4 (Parallel Port)
J1 (COM1 )
J2 (COM2)
5.4 J4: Parallel Port Connector
J4 is a DB-25 external connector as seen in the above figure. 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
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