<oozing sympathy>Poor Monk</oozing>
Someone has really dropped you in it here haven't they? I hope
you didn't smile an nod to this job before it landed on your desk.
Knowing next to nothing about IBM OS, I would suggest you arm yourself with
documentation about.
- IBM OS
- the application used to generate the tapes
- the whole EBCDIC ASCII ball of mud
Some things that will trip you up like variable block sizes/record lengths
you have already discovered. Getting OT now but your question might have generated
more responses if you explained a little more about the environment you are working
on the tapes in.
Do you hate Talking to Magnetic Tapes too?
I can't believe it's not psellchecked
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