188

1800 21 Sep 67

Had several many DECTAPE errors in system
EMERGENCY MAINT DECLARED at 1245

Found several tapes that tested
bad. One was an old scratch tape.
Another was a newer scratch tape.
Rewriting Block marks on this tape
gave 2 errors only. Rewriting them
again made the tape work test
OK. Another was a new tape that had just been opened.
Tried a new tape. It tested OK.

Conclusion: (pick 1)

a. Merely by coincidence several
bad tapes including one new
one had a random error that
went away.

b. There is an intermittent in the
Dectape controler that disappeared
about 1600, but will return
at some suitably embarrasing times.

I favor conclusion b.

Machine back at 1800
SRR