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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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Comos
Registered: May 2004
Posts: 73 |
Quoting Zibri
I didn't do that to brag or anything,
Well, you already did that from the beginning, instead of leading a normal technical discussion.Maybe if you change your manners,you'll get respected instead of getting fucked. |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
Geohot is giggling in the background :) |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting RaistlinI’d say some excellent and very interesting things have come up from this thread.
It’s not something that most of us can use, so I’ve seen people question the usefulness - but, hell, this is Commodore 64, a 35 year old machine, isn’t everything we’re doing pointless? :-)
Keep up the good work - and don’t worry about the trolls.
Yep. Commerically is surely pointless as of today.
But the basis you learn from this are useful even for today technology.
For example a discovery I did on 1541 lead to the possibility to double the scanning resolution on an optical scanner at no cost.
The two things seem unrelated, yet they are not :D |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting ComosQuoting Zibri
I didn't do that to brag or anything,
Well, you already did that from the beginning, instead of leading a normal technical discussion.Maybe if you change your manners,you'll get respected instead of getting fucked.
Nobody did that. They just argued against the facvts and produced another inaccurate loader (based on the same mistakes done in the past). That's all. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting GroepazGeohot is giggling in the background :)
About him, he is surely skilled but did you know that everything he published on the iPhone came from a russian guy?
It wasn't him to do the first jailbreak. He just published what the russian guy told him.
Anyway, after the fact he grew up and started to do things himself.
You remind me of him, you just look less skilled than him, and he was a kid at the time.
Now go fix VICE and try to not mess it up any further.
Oh no wait, you are the one pushing 3 commits just to correct comments... what a fullfilling job. |
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Comos
Registered: May 2004
Posts: 73 |
Quoting Zibri
Nobody did that. They just argued against the facvts and produced another inaccurate loader (based on the same mistakes done in the past). That's all.
Please read again your posts from the beginning properly,several times, you might get it. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Another small note:
Whithout using tricks, like shortening the original commodore PILOT tone ($6a00 $2f or $30 pulses)
Or the "inter-pilot" ($1a00 $2f/$30 pulses).
I found a way to load my loader in jusy 4 counter clicks.
Also this I didn't see it anywhere.
But if any of you did, please do tell.
I don't think there is a faster way to do it. Perhaps by little (I could make my loader a few bytes shorter) but not much.
The funny thing:
My loader now is not recognized by VICE (shows an empty tape) but it is recognized by the (emulated and RH) C64 :D |
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tlr
Registered: Sep 2003
Posts: 1790 |
Quoting ZibriAnother small note:
Whithout using tricks, like shortening the original commodore PILOT tone ($6a00 $2f or $30 pulses)
Or the "inter-pilot" ($1a00 $2f/$30 pulses).
I found a way to load my loader in jusy 4 counter clicks.
Also this I didn't see it anywhere.
But if any of you did, please do tell.
I don't think there is a faster way to do it. Perhaps by little (I could make my loader a few bytes shorter) but not much.
Do you mean just autostarting after loading only the first CBM data chunk? That happens for instance if using $029f/$02a0 for autostart and I guess also on ISTOP.
That kind of autostart is pretty common, although I think in most instances the second data block is still there even though it's not used.
For fast startup, keep your loader within the tape buffer and load max 2 bytes to trigger the autostart. |
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SLC
Registered: Jan 2002
Posts: 52 |
Quote: Another small note:
Whithout using tricks, like shortening the original commodore PILOT tone ($6a00 $2f or $30 pulses)
Or the "inter-pilot" ($1a00 $2f/$30 pulses).
I found a way to load my loader in jusy 4 counter clicks.
Also this I didn't see it anywhere.
But if any of you did, please do tell.
I don't think there is a faster way to do it. Perhaps by little (I could make my loader a few bytes shorter) but not much.
The funny thing:
My loader now is not recognized by VICE (shows an empty tape) but it is recognized by the (emulated and RH) C64 :D
If you mean putting your loader in the tape header and then overloading $029f-$02a0, it's been done before yes, including in my loader that I am very sure you've been peeking at already! |
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Martin Piper
Registered: Nov 2007
Posts: 722 |
Quote: Another small note:
Whithout using tricks, like shortening the original commodore PILOT tone ($6a00 $2f or $30 pulses)
Or the "inter-pilot" ($1a00 $2f/$30 pulses).
I found a way to load my loader in jusy 4 counter clicks.
Also this I didn't see it anywhere.
But if any of you did, please do tell.
I don't think there is a faster way to do it. Perhaps by little (I could make my loader a few bytes shorter) but not much.
The funny thing:
My loader now is not recognized by VICE (shows an empty tape) but it is recognized by the (emulated and RH) C64 :D
Either on a real C64 by copying the kernal into RAM and patching it: https://codebase64.org/doku.php?id=base:autoboot_tape_turbo_loa..
Or using TapeTool to write custom kernal format pulses and this code: https://github.com/martinpiper/C64Public/blob/master/IRQTape/Ta..
It's possible to have a very minimal loader that only uses two bytes to claim the vector at $300/$301, plus bytes in the tape header for the loader code.
This actually loads very quickly because the kernal does not even get to try to verify the memory with the second block as the error handler kicks in. |
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