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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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SLC
Registered: Jan 2002
Posts: 52 |
Here's my more or less working attempt just because I was bored. I just modified an old project right now to see if I could match Soci's RLL-attempt using a two pulse loader only, and this at least generates a TAP that can be written and loaded on my C2N. I somehow doubt if I can successfully load it on another C2N than what is used to write it with, though... but here it is anyway. No guarantees!
Archive includes the exe to create a .tap-file, the tap-file I wrote and the resulting tap-file from re-dumping just as a proof it still loads in VICE (you may need to disable wobble emulation).
https://colaku.com/~tomsk/pointless.zip |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting SLCHere's my more or less working attempt just because I was bored.
Would you be so kind to open your own thread for your own stuff, please? |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
P.S.
I never heard nor tried RLL so I can't compare to it.
I just have to finish this first.
Then I will release a couple of TAP files for you to play with. |
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SLC
Registered: Jan 2002
Posts: 52 |
Quoting ZibriQuoting SLCHere's my more or less working attempt just because I was bored.
Would you be so kind to open your own thread for your own stuff, please?
Not so much stuff, only contributing to the discussion with another reference point than Soci's RLL-based loader, and proof of concepts. Nothing I'm actively working on so creating an entire thread just for that seems silly :) |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Today's update:
the loader shrunk a little and improved.
Now I am starting to put parameters.
Today's game "Pharaohs curse" in it's original version, loads at 9150 bit per second at 80 cycle frequency "bandwidth" (or should I say accepted range?). As reliable as a commodore save.
Details:
The actual turbo data loads in 41 seconds.
The loader loads in about 21 seconds from tape (but if put on a cartridge in the future then that won't count).
I can post a video but it would be on emulators because it still needs to be tested on real hardware (but the standard is the same as before, so it will work unless I introduced some new bugs in the first refactoring).
If someone wants to be a beta tester, just write me a message, but no emulators. Only with real hardware.
Emulator tests are ongoing with core32/cute32 and they already hit 34 kilobit/sec. |
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Adam
Registered: Jul 2009
Posts: 323 |
Quote: Quoting SLCHere's my more or less working attempt just because I was bored.
Would you be so kind to open your own thread for your own stuff, please?
no code, no examples, only tweets and "just trust me, bro!" - ah, classic zibri. walls of text with nothing to show for it.
you're in no position to tell anyone what to do. never will be. would you be so kind as to go back to facebook or open up your own personal blog somewhere else? that'd be great, thanks. |
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bugjam
Registered: Apr 2003
Posts: 2589 |
Relax, no harm done here.
Personally I find this thread fascinating, even though I don't understand much of it. :) |
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Neo-Rio
Account closed
Registered: Jan 2004
Posts: 63 |
Would love to see how this stacks up against Gyrospeed.
GyroSpeedWin
Maybe if we could get statmat to shoehorn Zibri's code into Gyrospeedwin, I could test out writing some large TAPs to C90 tapes to see how Zibri's loader holds up on a huge mixtape. |
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ws
Registered: Apr 2012
Posts: 251 |
semi-related:
did anyone yet write a tool that digitizes audio from datasette? (like a datasette-based sampler, any links greatly appreciated)
and: is there already a datasette audio synthesizer that generates audio on a tape that then afterwards can actually be played on a normal cassette player? think "c64-bassdrum-generator-->audio to datasette"
just some friday-night-ratskrone export thoughts. |
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tlr
Registered: Sep 2003
Posts: 1790 |
Quote: semi-related:
did anyone yet write a tool that digitizes audio from datasette? (like a datasette-based sampler, any links greatly appreciated)
and: is there already a datasette audio synthesizer that generates audio on a tape that then afterwards can actually be played on a normal cassette player? think "c64-bassdrum-generator-->audio to datasette"
just some friday-night-ratskrone export thoughts.
I think there was a release doing this a few years ago, not sure.
I did a small hack trying this in my youth, as I assume many others did. It's going to be rather limited as the input is single edge detection only and the output is a one bit on or off. |
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