paper tape archiving
systems.glitch at gmail.com
Wed Jul 29 20:23:49 CDT 2020
Correct, the DSI NC2400 can be set up for different levels. It does require
a mechanical changeout for the punch, I think it's just a guide swap on the
reader. It's stepper feed but if you set it up for 2400 bps (default) and
let it run, tape motion is smooth and continuous.
HP 2100 series optical readers use a clutch to engage a constantly-running
drive motor, I haven't used my HP reader in a while (interfaced to S-100
through a custom card) but I seem to remember being able to keep the brake
from engaging with one of the control lines. Probably not a common enough
On Wed, Jul 29, 2020 at 9:17 PM Eric Moore via cctalk <cctalk at classiccmp.org>
> Absolutely would be good to have. I would prefer a slow smooth pull through
> the reader than slow and jerky or fast and smooth which are my current
> There are some kit paper tape readers out there that just need a pinch
> roller added to be ideal.
> On 5, 6, and 7 bit tape, I believe the DSI NC2400 which a number of people
> have is adjustable width. That said, a kit that came with a variable width
> optical read head and a variable speed smooth pinch roller with an RS232
> interface would likely find a market with hobbyists. No hard brake needed
> for archival purposes, but definitely a softer break to fairly quickly stop
> the tape if something goes wrong.
> On Wed, Jul 29, 2020, 19:43 Paul Koning <paulkoning at comcast.net> wrote:
> > > On Jul 29, 2020, at 6:52 PM, Eric Moore <mooreericnyc at gmail.com>
> > >
> > > ...
> > > A couple notes:
> > >
> > > 1) My reader when set to lower baud rates physically stops and starts
> > the reader. This jerks the tape and causes vibrations that can be severe
> > some speeds.
> > Some readers do this at all speeds. For example, any stepper motor is by
> > definition a start/stop drive at any speed. Fast optical readers may run
> > continuously if you let them, but that's worth a careful check.
> > since some of the high speed readers have very serious brake systems,
> > for their original application but not at all for our purposes. I've
> > tape readers specified at 1000 cps or better that are capable of stopping
> > at any point, starting up again, and reading the next character. So they
> > are doing 100 inches per second and stopping within 1/20th of an inch.
> > Ouch.
> > The best kind of archival tape readers would have an adjustable tape path
> > so you can read any of 5, 6, 7, or 8 channel tape. While 6 and 7 is
> > uncommon it does exist. 6 is probably least interesting, at least the
> > application I know is typesetting, not computing.
> > I've been thinking a newly constructed optical tape reader with
> > motion (no brakes), capstan drive, and slow ramp start/stop would be
> > and with today's technology quite easy to make.
> > paul
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