problem with reading source distribution tapes

[Dave Mason]

We have a standard university license for Unix, have the source tape,
and then were given/sold an IBM Series/1 Interactive Executive, a basically
SysV post with Berkley tty handlers (and completely mangled manuals) which
is a binary port.  I want to get some of the sources off our tape, which I
understood to be in cpio format, but cpio wants nothing to do with it, nor
does tar.  I have taken a quick look at it with od, and it looks vaguely
like a cpio format.  Any suggestions?
	Thanks	../Dave
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