4 Oct
2020
4 Oct
'20
8:47 p.m.
On 10/4/20 8:12 PM, jim stephens via cctalk wrote:
On 10/4/2020 4:00 PM, Chuck Guzis via cctalk wrote:
A couple of years ago, one of the NASA logging units turned up for not
much money. Big flight case. Basically consisted of a Kennedy
incremental drive (i.e. stepper) brought out to several BNC connectors.
My recollection is that the Kennedy 9000-series unit was NRZI and likely
800 bpi. Unlikely that you could get 16MB on a 10.5" reel with that.
Probably unreadable on standard tape drives with limited formatter
memory. I've also mentioned CDC 7-track "long tapes".
I've certainly seen the 9-track analog telemetry tapes also, but they're
a much different kettle of fish.
--Chuck
On 10/4/20 1:50 PM, J. David Bryan via cctalk
wrote:
Oil logging tapes write 9 tracks with no inter record gaps or file marks
till EOT.? I'm guessing you've not digitized any of those? <snip>
I don't believe that
you're missing anything.?? When I process these
files, I mask off the lower 24 bits as the block length.? A 16MB tape
block is impossibly large in any case.
--Chuck