On 03-May-15 12:42, Cory Smelosky wrote: > > An SC-40 with a DLT-7000 tape drive hanging off it, using a (Probably > heavily modified) TOPS-10. > Ah. Non-DEC hardware all around. > > Hmmmm. I wonder why the SC-40 running this TOPS-10 build is using > high-density mode then? > Probably because the SC hardware and TOPS-10 patches added support for it. It does pack data more densely. (2 words in 9 frames rather than 1 word in 5.)
> I've heard that there's some sort of command to change the tape > format, any ideas? > On a modified OS on non-DEC hardware? No. > If I have time later today, I'll write a conversion utility to convert a >> tape image from high-density to core dump mode. I suspect this will >> solve your problem - but in any case, it should be generally useful. >> > > Thanks, yes - that should help. > Pre-release on github, just for you. I just posted an announcement. >> Can you provide a (preferably small) sample tape so that I can verify >> this analysis? >> > > Sadly, it's >300M (explains the high-density mode, now that I think > about it) and I must control its spread so I'll send it to you off-list. > I don't accept mail bombs. If you e-mail something that large, it will be rejected by my mailer. You can test the conversion, or just do a backup of a small file (say, 10 blocks). That's all that's required to know if it works. If necessary, I can provide a dropbox on my server, but I don't think it's necessary. The math says it's probably high-density. It's possible that SC implemented a DIFFERENT high-density mode; in that case if you can scare up documentation on what they did, it's pretty easy to add a mode to tape36 (the converter.)
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