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Zibri
Account closed
Registered: May 2020
Posts: 304 |
New life for your underloved datassette unit :D
The first phase of testing just ended.
(Still in the packaging and refining phase)
But I wish to share with you all my latest accomplishment.
You might want to check this out:
https://twitter.com/zibri/status/1450979434916417540
and this:
https://twitter.com/zibri/status/1450979005117644800
The fastest example (11 kilobit/sec) has the same (or better) error rlsilience as "turbo250" but it is 3 times faster.
The slowest one (8 kilobit/sec) has the same error resilience as the standard commodore slow "save", but it is 100 times faster and twice as fast as turbo250.
;)
Notes:
1) faster speeds are possible if the tape is written with a professional equipment or hi-fi with a stabilized speed and virtually no wobbling.
2) if the tape is emulated (tapuino or similar projects) the speed can go up to 34 kilobit/sec.
3) even with datassette, higher speeds are possible but the highly depend on the status of the tape, the datassette speed and azimuth. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Here is the first test.
It will be tested on real hardware in the evening.
I repeat: I don't expect speed 9 to work unless the datassette is PERFECT. Speed 9 is meant to be used on professionally mastered tapes.
Speed 7 and 8 are more likely to succeed, but yesterday one of my testers succeded at speed 9... so we will see.
https://twitter.com/zibri/status/1457739686219223048
P.S.
The file used is the one provided by TLR |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quote: Quoting ZibriWith the exomized giana sisters file (assuming ALL bytes from 0801 to FFF0 were crunched, which I doubt it and I would prefer some of you could "exomize" the file "1" of the disk version of giana sisters which is my reference file)
gianna_1_084f.prg is the file I exomized. Not sure what the doubt about what was crunched is?
You didn't specify which gianna sisters image to use so I lifted it from The Great Gianna Sisters - Original Hiscores.d64 on your github. If that was an incorrect guess, please point me to the right file.
Oh.. nothing I didn't think you did it now.. I thought you just got it from somewhere.
Oh.. then it's ok...
Perfect.
P.S.
exomizer at first didn't want to work with my loader :D
I had to change the initialization code (before the jump)
The same code that worked with the normal Giana Sisters didn't work with the exomizer code.
I got crazy for an hour but the solution was a single line of assembly code.
Meh.
Note to quit polemics:
I stated that my turbo is the more reliable and fast ever released.
The only way to prove me wrong is to find a proof that something has been done and posted before I did.
And by something I don't mean just a piece of code. I mean a tape or a video showing a test on real hardware.
I would be glad to see it and change my statement.
Otherwise. You know... bite me. |
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Krill
Registered: Apr 2002
Posts: 2980 |
Maybe holding back on yet-unprovable claims until you release actual code would trigger fewer people to jump on you. =) |
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tlr
Registered: Sep 2003
Posts: 1790 |
Quoting ZibriOh.. nothing I didn't think you did it now.. I thought you just got it from somewhere.
Oh.. then it's ok...
Perfect.
you're welcome. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quote: Maybe holding back on yet-unprovable claims until you release actual code would trigger fewer people to jump on you. =)
1) I don't need to release any code.
2) my results are proved by engineers and as you can see random people (NeoRio, Flavioweb are normal users).
Oh and by the way, my turbo has done 34 kilobit on an emulated device (cute32, ultimate2 and vice) can any other (slc?) do the same? (this is off-topic since we are talking about the datassette... just wondering) |
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Krill
Registered: Apr 2002
Posts: 2980 |
Quoting Zibri1) I don't need to release any code. Sure. But claiming to be better than anyone else in 40 years, without proof... better be ready to take the heat. Also: Code or not true. :)
Quoting Zibri2) my results are proved by engineers and as you can see random people (NeoRio, Flavioweb are normal users). I see no proof of those claims. And engineers or not, their proof would be as good as anyone else's, because a proof is self-sufficient and doesn't need to appeal to authority.
Quoting ZibriOh and by the way, my turbo has done 34 kilobit on an emulated device (cute32, ultimate2 and vice) can any other (slc?) do the same? (this is off-topic since we are talking about the datassette... just wondering) Emulated devices are a lot more forgiving then real hardware, as you will know. Getting more speed out of them is the easy part. :) |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
I'd still like to know the metrics used for reliability, so we can apply them to other loaders and then compare. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quote: Quoting Zibri1) I don't need to release any code. Sure. But claiming to be better than anyone else in 40 years, without proof... better be ready to take the heat. Also: Code or not true. :)
Quoting Zibri2) my results are proved by engineers and as you can see random people (NeoRio, Flavioweb are normal users). I see no proof of those claims. And engineers or not, their proof would be as good as anyone else's, because a proof is self-sufficient and doesn't need to appeal to authority.
Quoting ZibriOh and by the way, my turbo has done 34 kilobit on an emulated device (cute32, ultimate2 and vice) can any other (slc?) do the same? (this is off-topic since we are talking about the datassette... just wondering) Emulated devices are a lot more forgiving then real hardware, as you will know. Getting more speed out of them is the easy part. :)
I repeat:
"code or not true" is a bulls*t. I don't do fake videos (I am not even able to) and for certain nor FlavioWeb nor NeoRio did fake videos. Also Andrea Nalli the engineer behing the CUTE32 device tested all versions including the "emu only" 30 and 34 kilobit versions. The latter once even exposed a small roungin error in his own code.
I sincerely see no better judge that a person who worked with this stuff for years and has a degree in engineering, and surely is more athoritative than a bunch of wankers.
Anyway, probably the code will be release at some point or in some product or in some demo, this has yet to be decided.
And yes, I know emulated devices are "perfect" (if correctly coded like the Cute32) but still I haven't seen a turbo performing on them at 34 kilobit. And with the jitter-fest I saw in the past in most loaders it's no wonder :D
Oh, and sure you can go even faster than 34 kilobit/sec... but you need a special code and not an "all purpose" loader as the one I did, where speed is just a parameter and can go from 34 kilobit to 4 (or less.. never tried it) and at 4 kilobit the frequency separation is MORE than the one used by commodore. So I can safely state that the error rate will be way less.
That's because what causes errors is "misinterpreting" a pulse lenght/width for another (weather you use 1,2 or 4 symbols). |
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Krill
Registered: Apr 2002
Posts: 2980 |
Still just claims and no proof. :) (And still authority or not doesn't mean anything.)
And what Groepaz said, there should be some kind of metric for reliability, which can be measured and compared by anyone interested enough. On tangible, well, code. :) |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
https://en.wikipedia.org/wiki/Argument_from_authority#Use_in_sc..
Quote:Scientific knowledge is best established by evidence and experiment rather than argued through authority as authority has no place in science. Carl Sagan wrote of arguments from authority:
One of the great commandments of science is, "Mistrust arguments from authority." ... Too many such arguments have proved too painfully wrong. Authorities must prove their contentions like everybody else.
(I strongly recommend "The Demon-Haunted World" by Carl Sagan - it's a phantastic resource on how to detect bullshit) |
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