Software Handshaking; Driver Defaults; Chapter 4 Page 46 - Brainboxes CC-265 Hardware Manual

PCI Quad RS232

Software Handshaking.

Switch: /X n[,xon,xoff]
Purpose:
Set port COMn to XON/XOFF handshaking. In this mode the
hardware handshake lines are ignored and the characters XON and
XOFF are used to control the flow of characters on the serial line.
The optional parameters XON and XOFF are decimal numbers
which are to be used as the XON and XOFF characters. Their
default values are 17 (DC1) and 19 (DC3) respectively. For
example:
/X2 or /X3,18,20
If n, the port number, is not given, then XON/XOFF handshaking
and any specified handshake characters are set for all ports, as
/X or /X,18,20

Driver Defaults.

When no switches are specified in the CONFIG.SYS file
the following defaults are used:
I/O Addresses.
On PC/XT/AT machines the ROM BIOS checks for COM1 and
COM2 at their usual I/O addresses (03F8H and 02F8H
respectively), and so these ports are automatically recognised. If a
port is present at 02F8H only then this becomes COM1. IBM PS/2
machines recognise the first 4 serial ports are automatically.
Interrupt Lines.
COM 1- 4
COM 2- 3
COM 8- -1 (meaning none set)
Multiport Cards.
No multiport cards are assumed to be present.
DOS Installation

Chapter 4 Page 46