DIGITAL-LOGIC AG
MSM800 SEV Manual V1.0A
24
4.4
Interface
4.4.1
Keyboard AT compatible and PS/2 Mouse
Pin
Signal
Pin 1
Speaker out
Pin 2
GND
Pin 3
Ext. reset input
Pin 4
VCC
Pin 5
Keyb. Data
Pin 6
Keyb. Clock
Pin 7
GND
Pin 8
Ext. Battery
Pin 9
Mouse Clock (PS/2)
Pin 10
Mouse Data (PS/2)
4.4.2
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 some other reference documents.
The current is:
IOH = 12 mA
IOL = 24mA
4.4.3
Serial Ports COM1-COM2
The serial channels are fully compatible with 16C550 UARTS. COM1 is the primary serial port, and is sup-
ported by the board's ROM-BIOS as the PC-DOS 'COM1' device. The secondary serial port is COM2; it is
supported as the 'COM2' device.
Standard:
COM 1/2:
National PC87317VUL: 2 x 16C550 compatible serial interfaces
Serial Port Connectors COM1, COM2
Pin
Signal Name
Function
in/out
DB25 Pin DB9 Pin
1
CD
Data Carrier Detect
in
8
1
2
DSR
Data Set Ready
in
6
6
3
RXD
Receive Data
in
3
2
4
RTS
Request To Send
out
4
7
5
TXD
Transmit Data
out
2
3
6
CTS
Clear to Send
in
5
8
7
DTR
Data TerminalReady
out
20
4
8
RI
Ring Indicator
in
22
9
9
GND
Signal Ground
7
5
The serial port signals are compatible with the RS232C specifications.
Summary of Contents for MICROSPACE MSM800SEV
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