Installation guide

196 Installation Guide for Clients
ram (Token-Ring Adapter and Token-Ring Adapter II only)
Specifies the physical RAM location on the adapter if the default
location is not adequate. The value of ram is a hexadecimal number
between 0xA000 and 0xF000, located on an 8K boundary for the
Token-Ring adapter or a 16K boundary for the Token-Ring II
adapter. The RAM location defaults to a location immediately
following the read-only memory (ROM) on the next appropriate
boundary. For example, if the ROM is at its default location of
0xCC00, the RAM defaults to 0xCE00 for the Token-Ring Adapter
and to 0xD000 for the Token-Ring Adapter II.
For strict compatibility with IBM defaults, set the ram value equal to
0xD800 for primary and 0xD400 for alternate. (See the primary
and alternate entries in this section.) This parameter does not apply
to the Token-Ring Adapter/A adapter. With the Token-Ring 16/4
Adapter and the Token-Ring 16/4 Adapter/A adapters, the use of
RAM paging is not supported, and the RAM size is determined by the
switch settings on the adapter.
When installing two IBM Token-Ring Adapter or two IBM Token-
Ring Adapter II adapters in a computer, the adapters must be
configured to use different RAM addresses. The RAM address each
adapter uses is specified by the RAM entry in its section of the
PROTOCOL.INI file. An easy way to be sure that the adapters use
different RAM addresses is to specify IBM as the value of the RAM
option in each adapter’s section of the PROTOCOL.INI file, as in the
following example PROTOCOL.INI entry:
This ensures that the primary adapter’s RAM is located at 0xD800,
and the alternate adapter’s RAM is located at 0xD400.
recvbufs
Specifies the number of receive buffers to use. Any memory left on
the adapter is configured as extra receive buffers.
recvbufsize
Specifies the size of the receive buffers in bytes. The value must be a
multiple of 8. The maximum size of a receive buffer depends on the
adapter you are using. The original Token-Ring Adapter, Token-Ring
Adapter II, and Token-Ring Adapter/A adapters allow only 2040
bytes. The newer Token-Ring 16/4 Adapter and Token-Ring 16/4
Adapter/A adapters allow 4096 bytes at the 4 megabits per second
(MBPS) adapter setting and 17,952 bytes at the 16-MBPS setting.
The minimum and default settings are both 256 bytes. Because the
incoming packet can span multiple receive buffers, it is not usually
necessary to change this entry. If the entry is set too high for the
adapter hardware, a configuration error occurs.
xmitbufs
Specifies the number of transmit buffers to allocate.