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Count Zero
Registered: Jan 2003
Posts: 1825 |
Release id #234562 : CBM Commodore C64 Tape Routines Exposed
Nice topic to document and definately worth putting in some reading time (though *I* did very few ( less than a dozen ) tapes back in the days).
Too bad it got hit by the lamer virus detection on silly drive-by-downloaders BUT the release could have been added as plain PDF, no?
A request for the next version - release as DIN A4 as well. My printout for the train looks strange :) |
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Fungus
Registered: Sep 2002
Posts: 625 |
Not sure what format that is. I can release as several other formats like docx and word and what not. Will do when I update it.
I noticed that Google's PDF converter screwed up some of the wrapping too on a few lines. It's bad enough I couldn't set the tab spaces, their editors are kind of very basic and not very useful, but I don't have adobe stuff anymore.
Glad people are liking it, I wanted to do it so I can make new tools without using the Kernel to do so. I find the software servo code really interesting.
I used to know what the encoding format was called, but I have since forgotten it and Google search is really bad the last few years and become increasingly useless and only gives ranked results that are done with some bad ai algo and you can no longer get good verbatim results. |
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bugjam
Registered: Apr 2003
Posts: 2492 |
Sure the PDF doesn't just need a PAL fix? :-)
SCNR
About the name of the encoding format, that is indeed an interesting challenge. I couldn't really find a conclusive answer yet, but I'd be happy to dig even further - if I actually understand your problem correctly, that is?!
Also, maybe Richard or SLC know something more? |
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Fungus
Registered: Sep 2002
Posts: 625 |
I doubt Richard knows anything about it.
SLC doesn't know, I'm helping him regularly with documenting tape loaders.
It's an old format from the 70s, and I just don't remember the name anymore. |
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tlr
Registered: Sep 2003
Posts: 1723 |
Quoting FungusIt's an old format from the 70s, and I just don't remember the name anymore.
Are you implying it is on non-Commodore origin?
The same format is used by the PET (but not the KIM-1), were there others before that? |
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Fungus
Registered: Sep 2002
Posts: 625 |
It's not of commodore origin, the idea was from something else. The implementation was different but unique to commodore. |
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Bansai
Registered: Feb 2023
Posts: 34 |
Quote: I doubt Richard knows anything about it.
SLC doesn't know, I'm helping him regularly with documenting tape loaders.
It's an old format from the 70s, and I just don't remember the name anymore.
Is "pulse length encoding" the term you are looking for?
https://techdocs.altium.com/display/FPGA/Infrared+Communication.. |
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Fungus
Registered: Sep 2002
Posts: 625 |
I think it was a telecom protocol. There's a data marker, 8 bits, and then a parity bit. Each encoded with two pulses. There is three pulse widths, short, medium and long. Or as they said back then, short, long and longlong. There's a specific name for it, but it's hard to find now. |
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chatGPZ
Registered: Dec 2001
Posts: 11136 |
Somehow i remember that we discussed this before and couldnt find an answer... I'd start looking around 70s mainframes tape stuff :) |
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Fungus
Registered: Sep 2002
Posts: 625 |
Yeah I remember talking about it on IRC many years ago, long since forgotten. |
