The linc-8_maint.linc is likely a LINC-8 tape for running
diagnostics. It does not appear to use a standard format.

* These came with Charles Lasner's LINC-8
8lib-sys3.linc	Unknown format. Only 3 blocks have different content.
ver_5-6.linc	Tape with 256 word blocks but unknown format
ver_5-6-2nd.linc	 The second set of blocks on the above tape