This directory contains the IRAF File I/O (FIO) routines. This version of FIO fully implements revision 5 of the FIO interface as described in Fio.hlp. Internally, however, the buffer management code has been simplified by restricting the number of buffers to one per file, and omitting global buffers. These features will be added in an upcoming revision of FIO. No modifications to the external specifications of the FIO interface should be necessary. D. Tody, 04-Apr-83. Jul84 Added filename mapping, filename locking, extensive modifications to make use of the new kernel.