Pin Assignments
B.2 Serial Port Connector
The pin assignment of the serial (COM1) port connector is as follows:
No
PIN ASSIGMENT (by: sort)
DESCRIPTION
1 DCDA#_T:I
Active low Data Carrier Detect inputs for the serial port.
2 SINA_T:I
Receiver serial data input for port 1.
3 SOUTA_12:O
Transmit serial data output for port 1.
4 DTRA#_6:O
Active low Data Terminal Ready outputs for the serial port.
5 GND
Ground
6 DSRA#_T:I
Active low Data Set Ready inputs for the serial port.
7 RTSA#_6:O
Active low Request to Send Outputs for the serial port.
8 CTSA#_T:I
Active low Clear to Send inputs for the serial port.
9 RI#_T:I
Active low Ring Indicator inputs for the serial port.
B.3 Parallel
Port
Connector
The pin assignment of the parallel/printer (LPT1) port connector is as follows:
No PIN
ASSIGMENT(by:
sort)
Description
1
STB#/DS0#_D14/_P14/_D12:O
An active low pulse on this output is used to strobe
the printer data into the printer.
The STROBE output is the complement of Bit 0 of the
printer control register.
Refer to parallel port description for use of this pin in
ECP and EPP mode.
Active low outputs select driver 0
2
PD0/INDEX3#_P14/_S:IO/I
Port data 0
This active low Schmidt trigger input senses from the
disk drive that the head is positioned over the
beginning of a track as marked by an index hole.
3
PD1/TRK0#_P14/_S:IO/I
Port data 1
This active low Schmidt trigger input senses from the
disk drive that the head is positioned over the
outermost track.
4
PD2/WRTPRT#_P14/_S:IO/I
Port data 2
This active low Schmidt trigger input senses from the
disk drive that a disk is write protected.
Any write command is ignored.
5
PD3/RDATA#_P14/_S:IO/I
Port data 3
Raw serial bit stream from the disk drive, low active.
Each falling edge represents a flux transition of the
encoded data.
6
PD4/DSKCHG_P14/_S:IO/I
Port data 4
This input senses that the driver door is open or that
the diskette has possibly been changed since the last
drive selection.
7
PD5_P14:IO
Port data 5
8
PD6/MTR0#_P14/_D12:IO/O
Port data 6
This active low outputs select motor drives 0.
9
PD7_P14:IO
Port data 7
10 ACK#/DS1#_T_D12:I/O
A low active output from the printer indicating that it
has received the data and is ready to accept new
data.
Bit 6 of the printer status register reads the ACK#
Input.
Refer to parallel port description for use of this pin in
ECP and EPP mode.
11 BUSY/MRT1#_T/_D12:_I/O
This is a status output from the printer, a high
indicating that the printer is not ready to receive new
data.
B-2
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