The checks used to be in update.c, but as they are related to
the intended file operation, they are better placed in fileio.c.
The checks affected are to refuse 'm' on output (file write),
and 'd', 'h', 'o', and 'b' formats on input (file read).
The new file type I is essentially Intel HEX that, on download, inserts
comments next to data records with the resolved effective address and an
ASCII dump of that same record. On upload the `I` format is permissive
with respect to check sum errors, eg, after manipulated an Intel HEX file
for debugging.
Stefan Rueger
Joerg Wunsch
Stefan Rueger
Marius Greuel
Yegor Yefremov