Specifications

MSM800XEV/XEL / Detailed System Description
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6.7.3 DDRAM Memory on MSM800XEV/XEL
Speed 333
Size DDR-Chips (BGA)
Bits 64bit
Capacity 256MByte
Bank 1
6.8 Interfaces
6.8.1 AT Compatible Keyboard & PS/2 Mouse X31
Pin Signal
1 Speaker out
2 GND
3 External reset input
4 VCC
5 Keyboard Data
6 Keyboard Clock
7 GND
8 Battery 
9 Mouse Clock (PS/2)
10 Mouse Data (PS/2)
 BAT input 3.0-3.6V, external lithium battery (see also Section 6.4.1).
6.8.2 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
6.8.3 Serial Ports COM1-COM2
The serial channels are fully compatible with 16C550 UARTS. COM1 is the primary serial port and is supported 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 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 Terminal Ready 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.