Information file for Auto Busmaster(**) Family NDIS MAC Device Driver
------------------------ Information About This Release ------------------------
Version 4.01.00
This device driver supports the following Auto Busmaster Family adapters:
- Ethernet Auto Busmaster MC32 Adapter
- Auto Busmaster MC32 Adapter
- Dual Auto Busmaster MC32 Adapter
- Dual Ethernet Auto Busmaster MC32 Adapter
- Auto Busmaster PCI Adapter
Note that previous versions of this device driver may not support all of the
adapters listed here, so you should reinstall with the latest version.
------------------------------ General Information -----------------------------
The message files for the Auto Busmaster Family NDIS MAC Driver are LXC.MSG and
LXCH.MSG. The messages and their associated help text refer in general to the
adapter name as Auto Busmaster Family adapter.
The Auto Busmaster Family NDIS MAC Driver supports Promiscuous Copy.
------------------------- Additions to the Publication -------------------------
Support for OS/2 Computers with more than 16 Megabytes of Memory:
The Auto Busmaster Family adapters use bus mastering to transfer data
between the computer and the adapter. For 16-bit adapters, or if an
adapter is placed in a 16-bit system slot, the adapter can only address
system memory up to 16 megabytes (MB). For this reason, the MPC.OS2
device driver will automatically configure and use local buffers
allocated below this 16 MB addressing limit. Frame data located above
16 MB will be copied into local buffers for frame transmission so
that it can be accessed by the adapter.
The following three messages were added to the device driver:
LXC0040 -- Slot nn: Using local transmit buffers to access data above
16 megabytes.
Explanation: The device driver has detected more than 16 megabytes
of RAM in the computer, and the adapter is either a 16-bit
adapter or is located in a 16-bit system slot. The device
driver will copy any frame data located above the 16 MB
address limit to local transmit buffers.
NOTE TO OS/2 2.0 USERS: Early versions of OS/2 2.0 will
only indicate that at least 16 MB of RAM exist in the
computer. If your computer has exactly 16 MB of RAM,
you will see this message. However, there will never be
any data above the 16 MB addressing limit to copy into
local buffers.
User Action: This is an informational message only. No action is
necessary.
LXC0041 -- Slot nn: Overriding MAXTRANSMITS in PROTOCOL.INI with a
value of xx.
Explanation: The amount of local memory needed to hold all possible
queued transmit frames, MAXTRANSMITS * MAXTXFRAMESIZE, is
greater than 128 kilobytes. The device driver has reduced
the MAXTRANSMITS value to allow the maximum number of
transmit frames to fit within the default 128 kilobytes of
local buffer space.
User Action: Ensure that the values specified for MAXTRANSMITS and
MAXTXFRAMESIZE are accurately specified in PROTOCOL.INI. If
not specified, they should both be added with appropriate
values.
The default values for these parameters in OS/2 are
MAXTRANSMITS = 31 and MAXTXFRAMESIZE = 18000, which exceeds
the 128 kilobytes allocated by the device driver for the
local transmit buffer space. These local transmit buffers
are needed when more than 16 megabytes of system memory is
detected, and this Auto Busmaster Family adapter is unable to
access above 16 megabytes.
A new PROTOCOL.INI parameter, LOCALBUFFSEGCNT, can be used
to change the amount of storage used for the local transmit
buffers. It can be set from 1 to 16, and defaults to 2 if
not specified. Note that 64 kilobytes of system memory are
used for each local buffer segment configured with this
parameter.
Example: LOCALBUFFSEGCNT = 2
LXC0042 -- OEMHLP could not be accessed.
Explanation: The Auto Busmaster Family adapter device driver was
unable to determine the amount of system RAM in the computer.
User Action: Contact your customer service center.
NDIS MAC Driver Messages Corrections: The following messages
should be as follows:
LXC0047 -- Could not determine the system I/O bus type
Explanation: The Auto Busmaster Family NDIS MAC Driver was
unable to determine the type of I/O bus designed into the
computer system. It is looking for a Micro Channel, ISA,
EISA, or PCI bus.
User Action: Make sure your system is based on a Micro
Channel, ISA, EISA, or PCI bus and contains an industry
standard BIOS. Contact your customer service center.
---------------------------- Additional Information ----------------------------
The Network Information File (NIF) to be used with the Auto Busmaster Family
NDIS MAC Driver is MPC.NIF, which contains configuration and tuning
parameters that can be adjusted by the user. Look at the NIF file for Help
text available on each parameter. Additional information on some parameters
is provided here.
LoopBack -- will default to OFF for an adapter that is either a
16 bit card or in a 16 bit system bus slot, AND is used for
Ethernet or 16 Mbps Token Ring operation. For all other cases,
loopback defaults to ON.
Enet20UTP -- enables 20 Mbps Ethernet operation in an Auto Busmaster
Family adapter that supports Ethernet. The adapter must be
attached with a UTP cable to a switched Ethernet concentrator
that supports full duplex operation for this function to be
activated. When this function is activated, the adapter loopback
mode will always be forced off, regardless of the setting of the
LoopBack parameter.
UseVDS -- allows the device driver to build the necessary data structures
for use with Virtual DMA Services (VDS). Setting this parameter to
"YES" is a requirement when using the Auto Busmaster Family NDIS MAC
driver with either Microsoft Windows(**) or Microsoft Windows For
Workgroups(**) in enhanced mode. It may also need to be set to
"YES" when using some memory managers that support VDS.
Maximum Frame Size Supported: the maximum frame size supported by the NDIS
MAC driver is determined by the SMALLEST of the following values:
- MaxTxFrameSize setting in PROTOCOL.INI
- (MinRcvBuffs x SizWorkBuf) PROTOCOL.INI parameters, less 4 bytes
- (10 x SizWorkBuf) PROTOCOL.INI parameter
- Largest frame permitted by the physical LAN medium (approximately 4500
bytes for 4 Mbps and 18000 bytes for 16 Mbps token rings, and 1514
bytes for Ethernet)
Microsoft Windows For Workgroups(**) Users: when entering or changing the
value of the Network Adapter Address parameter for the Auto Busmaster Family
adapter, you must enclose the address string in double quotes.
Example: "xxxxxxxxxxxx"
(**) Trademarks
---------------
Microsoft Windows is a trademark of Microsoft, Inc.
Microsoft Windows For Workgroups is a trademark of Microsoft, Inc.
