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 get_submodel_id                                                       QWIKC
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 Function       Gets the submodel_id on IBM computers.
 Syntax         void get_submodel_id(void);
 Remarks        The system_id and submodel_id variables are updated if a
                submodel ID exists.  It will only execute on recent models
                of XT, AT, and PS/2 models which have this ID.  Otherwise
                the variables will remain unaltered as set by qinit().
 Return value   None.  The result of the submodel ID check is stored in
                submodel_id.
 Restrictions   PC or XT clones must recognize IBM's system ID.