The VM version uses IOPACK, and both packages are available from the standard CERN program library PACKLIB, by using the command
CERNLIB
The IOFILEnn data sets read and written by EPIO must have filemode 4
(i.e. OS simulation) with options "RECFM U" and an appropriate blocksize.
For example, to access a disk data set "RAWDATA DATA" on logical
unit 10 for reading or writing an appropriate FILEDEF might be:
FILEDEF IOFILE10 DISK RAWDATA DATA A4 (RECFM U BLKSIZE 3600At present, concatenation of data sets is not supported under VM, but at CERN the FILEDEF option
"APPEND" is available for disk files.