Technical information

Newcom Parameters Serial Solutions
/A5,1B0h Serial port COM5 at address 01b0 hex.
<memsize>
A decimal number in the range 2-32768, rounded down to
the nearest power of 2. Used to set the size of the interrupt
driven i/o buffer.
<buffs>
Decimal number in the range 1 - maxport. Used to specify
the number of buffers to allocate. Each interrupt driven
port needs its own buffer so this also sets the maximum
number of ports that can be used in interrupt mode.
Driver Defaults.______________
When no switches are specified in the config.sys file the
following defaults are used:
I/O Addresses.
Only those ports found by the power on ROM BIOS check
are set up automatically.
On all PC compatibles the ROM BIOS checks for COM1
and COM2 at their usual I/O addresses, 03F8H and 02F8H
respectively so these ports are automatically recognised.
On most modern machines the ROM BIOS also checks for
COM3 at 03E8H and COM4 at 02E8H.
IBM PS/2 machines with the micro channel bus have
COM3 at 3220 and COM4 at 3228.
Interrupt Lines.
COM1 4
COM2 3
COM3- -1 (meaning none set)
Multiport Cards.
No multiport cards are assumed to be present.
Hardware Handshake.
All ports default to H4, the 3 wire No Handshake, that is
ports are always ready to send and receive data.
Chapter 2 Page 21