Connector Outlook
Board Location | Port | Connector cable | Adapter |
CN1 | Serial Port A | 9-Pin D Shell | No |
CN2 | Serial Port B | 10-Pin Header Type | 10-Pin to 25 Pin |
CN3 | Parallel Port | 25 Pin D Shell | No |
I/O BASE ADDRESS AND IRQ LEVEL
The 1/0 Card serial ports can be hardware assigned to four possible
I/0 base addresses,they are:
COM1 | 3F8-3FF Hex | |
COM2 | 2F8-2FF Hex | |
OR | ||
COM3 | 3E8-3EF Hex | |
COM4 | 2E8-2EF Hex |
The serial ports also can be assigned to various combination among four
IRQ levels ( IRQ 2, 3, 4, 5) by hardware selection.
Address | JP1 | JP5 | JP6 | JP9 | JP10 | JP11 | JP12 |
COM 1 (IRQ 2) | short | short | open | short | open | open | open |
COM 1 (IRQ 3) | short | short | open | open | short | open | open |
COM 1 (IRQ 4) * | short | short | open | open | open | short | open |
COM 1 (IRQ 5) | short | short | open | open | open | open | short |
* - Default setting
Address | JP2 | JP5 | JP6 | JP13 | JP14 | JP15 | JP16 |
COM 2 (IRQ 2) | short | short | open | short | open | open | open |
COM 2 (IRQ 3) * | short | short | open | open | short | open | open |
COM 2 (IRQ 4) | short | short | open | open | open | short | open |
COM 2 (IRQ 5) | short | short | open | open | open | open | short |
* - Default setting
Address | JP1 | JP5 | JP6 | JP9 | JP10 | JP11 | JP12 |
COM 3 (IRQ 2) | short | open | short | short | open | open | open |
COM 3 (IRQ 3) | short | open | short | open | short | open | open |
COM 3 (IRQ 4) | short | open | short | open | open | short | open |
COM 3 (IRQ 5) | short | open | short | open | open | open | short |
Address | JP2 | JP5 | JP6 | JP13 | JP14 | JP15 | JP16 |
COM 4 (IRQ 2) | short | open | short | short | open | open | open |
COM 4 (IRQ 3) | short | open | short | open | short | open | open |
COM 4 (IRQ 4) | short | open | short | open | open | short | open |
COM 4 (IRQ 5) | short | open | short | open | open | open | short |
Serial Port Interface signals and cables
The following table applies to the RS232 cable connected to serial port
A (CN 1) as well as Serial Port B (CN 2)
CN 1 | Signal | 25 pin Cable end |
1 | DCD (Data Carrier Detect) | 8 |
2 | RD (Receive Data) | 3 |
3 | TD (Transmit Data) | 2 |
4 | DTR ( Data Terminal Ready) | 20 |
5 | GND (Ground) | 7 |
6 | DSR (Data Set Ready) | 6 |
7 | RTS (Request to Send) | 4 |
8 | CTS ( Clear to Send) | 5 |
9 | RI (Ring Indicator) | 22 |
10 | Not Used | - |
PARALLEL PRINTER PORT
The I/0 card supports a parallel printer port which conforms with the
Centronics standard through a 25-pin D type connector (CN3). The parallel
port can be hardware assigned to two possible I/0 base address, they are:
LPT2 | 378-37F Hex | |
OR | ||
LPT3 | 278-27F Hex |
Address | JP3 | JP4 | JP7 | JP8 | JP17 | JP18 | JP19 |
LPT 2 (IRQ 2) | short | open | short | open | short | open | open |
LPT 2 (IRQ 5) * | short | open | short | open | open | short | open |
LPT 2 (IRQ 7) | short | open | short | open | open | short | short |
* - Default setting
Address | JP3 | JP4 | JP7 | JP8 | JP17 | JP18 | JP19 |
LPT 3 (IRQ 2) | open | short | open | short | short | open | open |
LPT 3 (IRQ 5) | open | short | open | short | open | short | open |
LPT 3 (IRQ 7) | open | short | open | short | open | short | short |
Page updated 98/07/14