ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
  º                                                                         º
  º            Serial Port Addresses and How They Relate to DOS             º
  º                                                                         º
  ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ

SERIAL PORT GENERAL NOTES

  The AB uses the standard IBM AT 9-pin serial connector. Other 9-pin
  connectors will not work.

  Our serial port will not work in the current loop mode.

  DOS Versions through 3.2 support COM1 and COM2 only.  DOS 3.3 supports
  COM3 and COM4 only on machines whose BIOS can detect the 3rd and 4th
  serial ports. (So far, only IBM PS-2 Models 50, 60 & 80 can do this).

  Should set COM1 at 3F8 and COM2 at 2F8 unless customer has special
  communications software that can recognize serial ports at 3E8 and 2E8.

  The AB serial port uses the Intel 82510 chip. The IBM Advanced diagnostics
  is looking for an older serial port chip so the AB Serial Port will fail
  the IBM Advanced Diagnostics. The only way to test the port is to use a
  serial device such as a mouse or modem on it.

DETECTING PORTS WITH DEBUG

  If you're having a problem determining which ports (parallel and serial)
  the computer is using, you can check for the I/O ports using DEBUG.

  Follow these steps to use DEBUG:

  1.   Change to the directory containing the DEBUG program and type
       "DEBUG".

  2.   At the DEBUG prompt, a dash, type "D 40:0" and press Enter.
       This will display the hexadecimal values of the active I/O port
       addresses, first serial then parallel.  Here's an example:

       C>debug
       -d40:0
       0040:0000  F8 03 00 00 00 00 00 00-BC 03 00 00 00 00 00 00
       -q (to exit DEBUG)

  This display indicates one serial port installed at 3F8 and one parallel
  port installed at 3BC.


ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
End of file                 Intel FaxBack # 1012          December 2,1992