On Sat, 18 Nov 2017, Ronald Natalie wrote:

> We commonly used “ar” to write DECtapes (TU58) back in the day.  If the 
> first block has a list of filenames, I’m betting that’s what it is!

Or ye olde "tp" format?  'Twas the precursor of "tar", and I dimly recall 
that it was wriiten for the Ducktapes (our old 11/40 had just about 
everything except that).

-- 
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."