EXTMT: A General Purpose Magnetic Tape Handler EXTMT is a FORTRAN callable magnetic tape handler written in MACRO. It is capable of reading or writing tapes in any ar- bitrary format. As herein implemented, the tape is mounted on drive zero. Use the "SET" keyboard command to select tape den- sity and lateral parity. To change the unit number, change the conditional assembly switch "CHANGE" in the assignments section of the MACRO source as desired prior to assembly of the subrou- tine. Complete instructions on the FORTRAN calling sequence are presented in a description section of the MACRO source. Three applications programs written in FORTRAN and one in MACRO are included with the submittal of this handler. The FORTRAN programs write to (WDOSMT), read from (RDOSMT), and pro- duce a directory of (DSMTDR) magnetic tape in DOS/BATCH format. The MACRO program (RWMT) will rewind and take offline the selected tape drive(s). Complete user instructions are included as comments within each of these programs. The subroutine, EXTMT, and the programs, DSMTDR, RDOSMT, WDOSMT and RWMT, are executable under both RT-11 and TSX-Plus. N. A. Bourgeois, Jr. / 9238 Sandia National Laboratories P. O. Box 5800 Albuquerque, NM 87185 17-Jun-82