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5.4.2.
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 other reference documents.
The current is:
IOH = 12mA
5.4.3.
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:
Serial Port Connectors COM1, COM2:
Pin
Signal Name
1
CD
2
DSR
3
RXD
4
RTS
5
TXD
6
CTS
7
DTR
8
RI
9
GND
The serial port signals are compatible with the RS232C specifications.
5.4.4.
Floppy Disk Interface
The onboard floppy disk controller and ROM-BIOS support one or two floppy disk drives in any of the
standard PC-DOS and MS-DOS formats shown in the table.
Supported Floppy Formats:
Capacity
Drive size
1.2MB
5-1/4"
720K
3-1/2"
1.44M
3-1/2"
Floppy Interface Configuration
The desired configuration of floppy drives (number and type) must be properly initialized in the board's
CMOS - configuration memory. This is generally done by using DEL or F2 at boot up time.
Floppy Interface Connector
The table shows the pin-out and signal definitions of the board's floppy disk interface connector. It is
identical in pin-out to the floppy connector of a standard AT. Note that, as in a standard PC or AT, both
floppy drives are jumpered to the same drive select: as the 'second' drive. The drives are uniquely
selected as a result of a swapping of a group of seven wires (conductors 10-16) that must be in the
cable between the two drives. The seven-wire swap goes between the computer board and drive 'A';
the wires to drive 'B' are unswapped (or swapped a second time). The 26pin high density (1mm pitch
FCC) connector has only one drive and motor select. The onboard jumper defines the drive A: or B:.
Default is always A:.
MSM800SEV/SEL/BEV/XEV/XEL Detailed Manual V1.7
IOL = 24mA
National PC87317VUL:
Function
Data Carrier Detect
Data Set Ready
Receive Data
Request To Send
Transmit Data
Clear to Send
Data Terminal Ready
Ring Indicator
Signal Ground
Tracks
Data rate
80
500KHz
80
250KHz
80
500KHz
49
2 x 16C550 compatible serial interfaces
in/out
DB25 Pin
in
8
in
6
in
3
out
4
out
2
in
5
out
20
in
22
7
DOS version
3.0 - 6.22
3.2 - 6.22
3.3 - 6.22
DB9 Pin
1
6
2
7
3
8
4
9
5
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