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
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,
That seems to me like it would be the trickiest part. The TU58 schematic
appears to indicate that there are
I think so. Of course you could cheat by making it a read-only tape. But I
don't like that.
separate erase head gaps (not on a separate head like in audio cassette
drives), so
On Jun 16, 2015, at 12:10 PM, tony duell a...@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
On Jun 16, 2015, at 09:10 , tony duell a...@p850ug1.demon.co.uk wrote:
You would, of course, not know which track it was reading, so you would have
to output 2 blocks, one on
each track, at once. And how would you detect it was writing? Look for an
extra signal at the coupling head
or
And yet another (possibly the most common one on computers) is to have a
small drive wheel that pulls the tape at constant speed across the
heads, and then have some other construction that drives the tape reels
depending on tape tension or length. Think vacuum columns or spring
loaded arms.
On 2015-06-16 19:51, tony duell wrote:
And yet another (possibly the most common one on computers) is to have a
small drive wheel that pulls the tape at constant speed across the
heads, and then have some other construction that drives the tape reels
depending on tape tension or length. Think
On 06/16/2015 11:08 AM, Henk Gooijen wrote:
The round (approx 2 diameter) bearings of the TU80 do not rotate.
Instead, the metal has tiny holes. Air pressure pushes the tape away
from the bearings. As the tape moves, due to movement pressure, the
tape comes closer to the air bearing. That is
On 06/16/2015 11:22 AM, Johnny Billquist wrote:
Uh... The TU80/TU81 do not have vacuum columns...
I didn't say that they did, Johnny. I said that the TU80 hails back to
the vacuum-column CDC drive design of the 1960s. At least that's my
understanding.
--Chuck
On 2015-06-16 18:21, Paul Koning wrote:
On Jun 16, 2015, at 12:10 PM, tony duell a...@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
-Oorspronkelijk bericht-
From: Johnny Billquist
Sent: Tuesday, June 16, 2015 7:31 PM
To: cctalk@classiccmp.org
Subject: Re: On the Emulation of TU58s
[... snip ...]
And then we have drives like the TU80/TU81 which do not seem to fit into
any of the mentioned categories. I'm
On 2015-06-16 20:23, Mark J. Blair wrote:
On Jun 16, 2015, at 11:22 , Johnny Billquist b...@update.uu.se wrote:
Pretty much the standard CDC vacuum-column design since the 1960s. The
TU80 is, after all, a CDC product. Two counter-rotating capstans--tape
movement is determined by applying
On Jun 16, 2015, at 11:22 , Johnny Billquist b...@update.uu.se wrote:
Pretty much the standard CDC vacuum-column design since the 1960s. The
TU80 is, after all, a CDC product. Two counter-rotating capstans--tape
movement is determined by applying positive or negative pressure to
ether or
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
[Driving tape]
Another solution is to avoid the problem entirely by not requiring constant
linear speed. That’s what DECtape
(the real one) does.
Sure. A number of tape drives were built that way, the HP9865 (and thus the
built-in tape drive on the
HP9830) is another example.
One is
On 2015-06-16 20:20, Chuck Guzis wrote:
On 06/16/2015 11:08 AM, Henk Gooijen wrote:
The round (approx 2 diameter) bearings of the TU80 do not rotate.
Instead, the metal has tiny holes. Air pressure pushes the tape away
from the bearings. As the tape moves, due to movement pressure, the
tape
On 06/16/2015 01:54 PM, Brent Hilpert wrote:
Once ran across a Honeywell drive (7-track) that had a 'vacuum
capstan'. The capstan wheel had a vacuum path through the axle and
then transferred the vacuum out to holes around the perimeter. So
rather than a pinch roller or rubber frictional
-Oorspronkelijk bericht-
From: Johnny Billquist
Sent: Tuesday, June 16, 2015 8:22 PM
To: cctalk@classiccmp.org
Subject: Re: On the Emulation of TU58s
On 2015-06-16 20:20, Chuck Guzis wrote:
On 06/16/2015 11:08 AM, Henk Gooijen wrote:
The round (approx 2 diameter) bearings
On 2015-06-16 21:20, tony duell wrote:
And yet another (possibly the most common one on computers) is to have a
small drive wheel that pulls the tape at constant speed across the
heads, and then have some other construction that drives the tape reels
depending on tape tension or length. Think
On 2015-Jun-16, at 12:31 PM, Paul Koning wrote:
On Jun 16, 2015, at 3:20 PM, tony duell a...@p850ug1.demon.co.uk wrote:
...
The actual tape movement as such, is all done by the small wheel next to
the head, which just runs the tape past the head.
Which is essentailly the same as the capstan
On Jun 16, 2015, at 09:10 , tony duell a...@p850ug1.demon.co.uk wrote:
Incidentally, given the fact that a constant motor speed - constant tape
speed, it should be possible to
make a device to put the timing track on a blank tape for the TU58. Has
anyone done that?
There's no timing
And yet another (possibly the most common one on computers) is to have a
small drive wheel that pulls the tape at constant speed across the
heads, and then have some other construction that drives the tape reels
depending on tape tension or length. Think vacuum columns or spring
loaded
Johnny Billquist wrote:
Then you can figure out tape speed across the
heads (if you care) by just observing flux changes.
Tony Duell wrote:
Only if there is something on the tape. These computer tape drives could
surely record on a
totally blank tape and get the right number of bits per
On 06/16/2015 11:30 AM, Henk Gooijen wrote:
well, the tiny space between the tape and the air bearing could
be regarded a vacuum column, but it's a very short one :-)
The two air bearings are immediately above and below the R/W
and erase head. And they do *not* rotate. The tape glides on
an air
On Jun 16, 2015, at 3:20 PM, tony duell a...@p850ug1.demon.co.uk wrote:
...
The actual tape movement as such, is all done by the small wheel next to
the head, which just runs the tape past the head.
Which is essentailly the same as the capstan in an audio tape recorder,
albeit the
On Jun 16, 2015, at 12:46 , tony duell a...@p850ug1.demon.co.uk wrote:
For something even madder, look at the design of the original Radio Shack
'Line Printer' which was
actually a Centronics something-pr-other (733?). This thing (which is not a
line printer at all) has a belt
running
On Jun 16, 2015, at 3:48 PM, Eric Smith space...@gmail.com wrote:
Johnny Billquist wrote:
Then you can figure out tape speed across the
heads (if you care) by just observing flux changes.
Tony Duell wrote:
Only if there is something on the tape. These computer tape drives could
surely
27 matches
Mail list logo
