RevMedia

Contains a number indicating whether there is a numeric co-processor installed. If this is 0 there is not a co-processor (or the (E) option has been invoked at logon). If this is not 0 the number will be one greater than the type of co-processor installed, eg 4 = 387 etc.

Note that the only system routine which seems to make explicit use of this variable is RTP33 (Locate By) so operations involving this (EG Indexing et al) would benefit from the addition of a numeric coprocessor. Cannot be amended.