16 Jun
2015
16 Jun
'15
9:51 a.m.
Mark, I've thought of that for my HP 9845, too. Sure would be nice to
fabricate something that's flexible hardware that can be programmed for the
peculiarities of various implementations. I'll put it on my list of things
to do once I'm done with my dissertation. :-)
On Tue, Jun 16, 2015 at 4:21 PM, Paul Koning <paulkoning at comcast.net> wrote:
design. Of
course the general problem is
--
Ian S. King, MSIS, MSCS, Ph.D. Candidate
The Information School <http://ischool.uw.edu>
Archivist, Voices From the Rwanda Tribunal <http://tribunalvoices.org>
Value Sensitive Design Research Lab <http://vsdesign.org>
University of Washington
There is an old Vulcan saying: "Only Nixon could go to China."
On Jun 16, 2015, at 12:10 PM, tony duell <ard
at p850ug1.demon.co.uk>
wrote:
>
> As long as we're talking philosophy, what do y'all think about
emulating the TU58 drive, vs. emulating the TU58 > *tape*?
>
> I cannot properly express my opinion of that tape cartridge design even
if I
violate list rules about use of
> profanity. But the drive itself isn't all
that bad, aside from not
having enough motors to manipulate a
well-designed tape cartridge mechanism.
The tape cartridge (along with QIC cartridges, etc) is an interesting to run the tape at constant linear speed past the
head while winding it
off one reel onto the other. In general
there have been 3 solutions to this.
Another solution is to avoid the problem entirely by not requiring
constant linear speed. That?s what DECtape (the real one) does.
One is to drive the tape itself using a capstan and maybe a pinch
roller. Then
have the takeup spool
driven too fast with a slipping clutch in-line.
And a weak brake on the
supply spool. This of course is what
was done in audio recorders (reel to reel and
cassette), Video recorders
(ditto), etc.
Or a variant: drive the takeup reel with a controlled torque motor and no
slip clutch. I think professional grade tape decks may have been built
that way.
paul