U UNIVAC 1218 - Bitsavers

3) That-address 00141 is reserved for use by UMTH as an indirect interrupt
address.
4) That the contents of AU, AL, and B prior to entering UMTH need not
be restored upon exit.
5. MAGNETIC TAPE DUPLICATION MODULE (MTDUP)
5.1 PROGRAM DESCRIPTION
The MTDUP module of UPAK III may be used with the computer when operating with
one magnetic tape unit with two transports and an I/O console. The module
copies the content of one magnetic tape (From tape) onto another (To tape).
The normal copy process continues until MTDUP encounters two consecutive
tape marks or until end-of-tape, whichever occurs first.
MTDUP performs the duplication in the following sequence:
1) Rewind From tape and To tape.
2) Read one record from From tape into user-specified buffer.
3) Use buffer control words to determine buffer limits, and write the
record on the To tape. Repeat steps 2) and 3) until two successive tape
marks have been found or end-of-tape is detected.
4) Rewind both tapes if verification option is selected.
5) Read one record from From tape into user-specified buffer and checksum
the record.
6) Read one record from To tape into user-specified buffer and checksum
the record o Compare record checksum for From and To tapes. If not
equal, add one to error counter; repeat steps 5) and 6) until two
successive tape marks or end-of-tape have been found.
7) Rewind both tapes if rewind option was selected.
8) If the error counter is zero, type COPY-OK; otherwise type ERR-XXX
where XXX is the number of copy errors detected.
NOTE: The user may alter the number of successive tape marks terminating
his From tape. To do this, he must store the exact number desired
at MTDUP label CAT.
MTDUP occupies approximately 7128 memory locations and may be loaded anywhere
in computer memory above address 01000 with the restriction that the entire
module must be loaded entirely within one memory bank. The module operates
either under program control or manually from the computer control panel.
IV-B-18