2 interfaces, 1 ps/2 keyboard (at compatible) and ps/2 mouse, 2 line printer port lpt1 – Compaq MICROSPACE MSEBX900 User Manual
Page 33: 3 serial ports com1 - com2, Interfaces, Ps/2 keyboard (at compatible) and ps/2 mouse, Line printer port lpt1, Serial ports com1 - com2, Digital-logic ag
DIGITAL-LOGIC AG
MSEBX800/900 Detailed Manual V1.0
33
5.2. Interfaces
5.2.1.
PS/2 Keyboard (AT Compatible) and PS/2 Mouse
X31
Keyboard
Pin Signal
Pin Signal
1
KB_Data
2
-
3
GND
5
+5Volt / 100mA
6
KB_Clk
8
-
X32
Mouse
Pin Signal
Pin Signal
1
MB_Data
2
-
3
GND
5
+5Volt / 100mA
6
MB_Clk
8
-
5.2.2.
Line Printer Port LPT1
A standard bi-directional LPT port is integrated into the MICROSPACE PC.
Further information about these signals is available in numerous publications, including the IBM technical
reference manuals for the PC and AT computers and from other reference documents.
The current is:
IOH = 12mA
IOL = 24mA
The SMC 37C672 may be programmed via software commands.
In the new BIOS version, this selection may be controlled with the BIOS setup screen.
5.2.3.
Serial Ports COM1 - COM2
The serial channels are fully compatible with 16C550 UARTS.
X30B / X39
Serial Port Connectors COM1, COM2
Pin Signal Name Function
in/out
DB25 Pin
DB9 Pin
1
CD
Data Carrier Detect
in
8
1
2
RXD
Data Receive Data
in
6
6
3
TXD
Transmit Data
out
3
2
4
DTR
Data Terminal Ready
out
4
7
5
GND
System Ground
-
2
3
6
DSR
Data Set Ready
In
5
8
7
RTS
Request to Send
out
20
4
8
CTS
Clear to Send
in
22
9
9
RI
Ring Indicator
in
7
5