MAPIDA='ON' | 'OFF'

Under AMOS, ISAM Plus files are given the same extensions as their ISAM 1.x counterparts, namely .IDA for the data files and .IDX for the index files. Under A-Shell, however, C-ISAM or D-ISAM are used to implement ISAM Plus. This gives the data files extension .DAT; the index files have the same extension.

Many BASIC programs are likely to use the lookup and kill statements on BASIC ISAM Plus data files. If MAPIDA is specified as true, then an extension of .IDA will be mapped onto an extension of .DAT if no file with extension .IDA exists.

Care must be taken specifying MAPIDA if ISAM 1.x applications are to run concurrently with ISAM Plus. It is possible that some minor programming changes will be required in terms of LOOKUP and KILL.