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The default I/O units,
specified by `READ fmt',
`READ (UNIT=*)',
`WRITE (UNIT=*)', and
`PRINT fmt',
should not be units 5 (input) and 6 (output),
but, rather, unit numbers not normally available
for use in statements such as OPEN and CLOSE.
Changing this would allow a program to connect units 5 and 6
to files via OPEN,
but still use `READ (UNIT=*)' and `PRINT'
to do I/O to the “console”.
This change probably requires the libg77 project.