Maps for use with O can also be made with amappage (an old program, much abused by many over the years, and distributed with FRODO) running on a VAX,and then transferred to the workstation with ftp. Here is an example, where the user is logged on the workstation (an ESV say)
% ftp xray \ldots ftp> cd [.work] ftp> binary ftp> get m14_f21.map ftp> quit % /user/alwyn/o/bin/es_swapbytes brick file : m14_f21.map