AIOCOMX.TXT
17Jun94

If AIOCOMX detects a 16550 UART, the maximum port speed defaults to
19.2kbps.  If a 16550 UART is not detected, the maximum port speed
defaults to 2400bps.

However, some devices (including many internal modems) are capable of
properly supporting a higher speed than the default values.

If you have a buffered device capable of supporting speeds higher than
the default rate, use the following load command where N is the
maximum speed rating override:  MAXRATE=N

For example:  
  LOAD AIOCOMX MAXRATE=14400 PORT=3F8 INT=4 NODE=0 NAME=BOARD0
would set an internal modem at comm1 to 14.4.
 
NOTE!! In theory, very high speeds can be set.   
However, it is important the MAXRATE command not be abused.
  A. The practical safe speed is determined by the buffering ability
  of the communications device.
  B. Even with extremely capable devices, speeds above 38400 are
  likely to result in lost characters.
  C. The CPU of a busy file server will be stressed, if it has to
  drive a comm port at very high speeds.

Additional AIOCOMX LOAD Parameters:

1. ?
Driver command line load information is available by entering 'LOAD
AIOCOMX ?' at server prompt.  (The driver will not be loaded.)

2. NODE= 
AIO requires that the comm ports be numbered starting from zero and
that they have contiguous numbers.
Therefore include a "node=" parameter on the command line.  
For example:
  LOAD AIOCOMX PORT=3F8 INT=4 NODE=0 NAME=COM1

sets the board number for this invocation of the driver to zero.
Succeeding load commands for the driver require "node=1", "node=2" ...

3. PORT=N
Where N is the hexadecimal port address which the device resides.

4. INT=N
Where N is the interrupt number assigned to the particular port.

5. NAME=Y  
Where Y is the user defined name which correlated to the board loaded.

6. NODE=N  
Where N is the decimal number which will override the hardware defined
board number.  Ordinarily COM1 is assigned board 0, and COM2 is
assigned board 1.

7. FORCE   
FORCE overrides hardware device validation, resulting in the driver
using the specified hardware resources regardless of whether they
exist.
8. NOFIFO
NOFIFO will override the automatic selection of 16550 FIFO mode.
Regardless of whether 16500 FIFO mode capability has been detected.

9. RXT=N  
Where N is the default override value to use for the transmitter data
queue, when 16550 FIFO mode has been selected.

10. TXQ=N   
Where N is the default override value to use for transmitter data
queue, when 16550 FIFO mode has been selected.

AIOCOMX Performance Issues:
1. AIOCOMX automatically configures itself to run in enhanced (FIFO)
mode if it detects a 16550 UART.  The receiver data threshold and
transmit queues for the FIFOs can be changed by the user if this mode
is allowed, but their default values are probably optimal.  If a 16550
device is not present in your system the user is prohibited from
attempting to place the driver in enhanced mode.

2. Only ONE port is loaded for each installation of the driver.

3. Operates in both NetWare 3.x and 4.x environments.

4. Multiple command line options available at driver load time.

5. This AIOCOMX allows AIO applications to use the built in serial
ports on the server or those of an add in card that emulates standard
serial ports. 

Up to four such ports can be supported.  Each port requires it's own
interrupt.