Shared Ram - IBM Token-Ring Network PC Adapter Manual To Operations

Shared RAM
The IBM Token-Ring Network PC Adapter II contains random
access memory (RAM) that is shared with the system unit. Valid
locations must consist of four hexadecimal digits that represent
the upper four digits of a five-digit hexadecimal address. This
location should be on a 16-Kb boundary. The default memory
location for the primary adapter (where the system unit finds the
RAM) is D800. For the alternate adapter it is D400. If the
features that your system unit has installed use these locations,
you will need to assign other locations that are not used. The
IBM Token-Ring Network PC Adapter II needs 8 Kb of memory
above this address when Switch 10 is On and 16 Kb of memory
above this address when Switch 10 is Off.
To find locations that can be used. see Appendix B for a list of
IBM-defined memory locations. To code the Shared RAM
location, see the next section, "Coding Adapter Parameters" on
page 4-8.
Note: If you have two adapters. the Shared RAM address for the
alternate adapter must be different from the primary adapter.