[Simh] Tape conversion

[Timothe Litt]

https://github.com/tlhackque/backup36 contains a pre-release of the
tape36 component of backup36.

As this is a pre-release and largely untested, set your expectations
accordingly.

It is intended to convert between any of the tape packing formats
supported by pdp-10 hardware.

It has had **very** limited testing, but it does successfully round-trip
at least one file between high-density and core dump mode.

Note that it always writes an end-of-media marker on the output file;
converting core-dump to core-dump may give a difference of 4 bytes, with
the extra 4 at EOF being 0xFFFFFFFF.  This is expected.

See the README for build instructions.  It has usage with --help.

For the case of high-density to core dump, it's

       tape36 -ihigh-density infile.tap outfile.tap

Add a -v if you like.

I have not tested the other formats at all.  If someone with energy
does, let me know your results.

Enjoy.

This communication may not represent my employer's views,
if any, on the matters discussed. 



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