DIGITAL-LOGIC Microspace MSM586SEN - Interface; Keyboard at Compatible and PS;2 Mouse; Line Printer Port LPT1; Serial Ports COM1-COM4

DIGITAL-LOGIC AG MSM586SEN/SEV Manual V1.5E
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4.3 Interface
4.3.1 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 External battery 3.0V
Pin 9 Mouse Clock (PS/2)
Pin 10 Mouse Data (PS/2)
4.3.2 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
The SUPER I/O 37B787 may be programmed via software commands.
4.3.3 Serial Ports COM1-COM4
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: ELAN520: 2 x 16C550 compatible serial interfaces
COM 3/4: 37B787: 2 x 16C550 compatible serial interfaces
Serial Port Connectors COM1, COM2, COM3, COM4
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.