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Section A:
System interface
The file· search is started with in the local user area.
If the file
is
not present there,
a second attempt is performed in user area 0.
Could
the
file be found there,
the system attribute (bit t2') is tested
for
being set.
If so, the file is opened in read only mode. This file state
is flagged by setting attribute bit f8'.
This
mechanism allows for accessing files in user area 0 from any other
user area. It becomes thus unnecessary to have a copy of each program in
each user area.
If extent 0 has been opened and time stamps on file access is
specified
in the directory label, time stamping is performed now.
On a successful search, A and H are both set to 0. If the file could not
be found, A is set to 0FFH and H to 0.
In
case
of
physical errors,
a message is displayed and
the
program
aborted
in the normal error handling mode.
If the error mode has
been
changed
by
function 45,
A is set to 0FFH and H to one
of
the
above
mentioned error numbers.
EOS System manual
Daeumling & Zimmermann
Page 47
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