27 January 2019, 01:37 | #41 | ||
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27 January 2019, 02:14 | #42 | |
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(*SCART in this case is actually RGB that gets translated into Y/C by the VRC) While it is still stored on tape as a modulated signal, it has a much better signal to noise ratio and less artifacts. So I do not really see a big technical problem here to e.g. use two different Y signal-states in addition to the two C values (black and white), which would double the density. For comparison: Some SVHS VRCs were able to store 48kHz 16-bit stereo digital audio on the audio-track next to the video information. This means 4 bytes x 48k x 3600 / 1024 equals 675 MB per hour! Only on the audio-track, which only occupies a small fraction of the tape. DTRS and DA-88 use Hi8-video-tapes to store multiple digital audio tracks (24bit and up to 192 kHz) - typically 4,8 GB per tape Last edited by Gorf; 27 January 2019 at 02:34. |
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27 January 2019, 16:36 | #43 |
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30 January 2019, 21:06 | #44 | |
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(Not all VRCs will be able to record with this setup.) |
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21 November 2019, 00:00 | #45 |
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Video Backup
can you still get the cable for to do it as I know of 27-30 tapes have been giving away a few months ago. I'd love to get them and archive for us all. I still have a VHS recorder
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23 November 2019, 08:43 | #46 |
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Hardly anyone had the original interface, but the schematics were floating around on BBSes back then.
They are probably still available in some BBS dump. I can also dump the VBS tapes if you can get them to me, I have the tools for this. |
23 November 2019, 11:51 | #47 |
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25 November 2019, 12:50 | #48 |
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Wow, that's advanced. All of the ones I've seen (all were clones) were through hole on vero board..
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25 November 2019, 13:52 | #49 |
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I still have my VBS interface somewhere, IIRC was even smaller than that... should see if I can disassemble without destroying it to see how it looks inside.
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25 November 2019, 14:42 | #50 |
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I found this http://leszczamiga.ppa.pl/elektronika/vbs.gif
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25 November 2019, 20:23 | #51 |
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I almost bought one. I was living in Eindhoven (NL) as a student (1993?). Got chatting with the author (who also lived in Eindhoven) probably on Usenet.
Found the name: Lyppens Software Productions |
06 December 2019, 22:45 | #52 |
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Might be worth it just to reverse-engineer the VBS backup format in the software, then decode the videos in software. The actual data stream in VBS seems to be fairly straightforward (4 bytes per line separated by pulses of black, plus a period sync mark) so you'd just have to figure out how the VBS software encodes its compression/error-corection, and that was almost certainly all done in software with the physical device just laying out the bits into the video stream.
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07 December 2019, 18:47 | #53 |
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I had one of those VBS devices ... only recently I discovered it had a feature I believe for backing up floppy disks to tapes. Used it primarily back in the day for backing up my Amiga HD.
I did reach out to the author to show interest to see if he would give access to source code / github or Amiga Preservation site. He showed interest, but then I got the impression he wasnt interested, after a few further emails. Great little grey device. |
21 January 2020, 10:17 | #54 |
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Never used, I barely remembered its existance
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16 March 2024, 12:59 | #55 | |||
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Quote:
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Last edited by pandy71; 16 March 2024 at 14:04. |
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16 March 2024, 13:08 | #56 | |
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16 March 2024, 13:37 | #57 |
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Oh, i should have 2 or 3 tapes with backup data from Amiga but they was recorded like 30 years ago and have no working VCR so probably you are right on this - my memory was like single byte per line (counting static stripes for start/stop) - so if you say 4 bytes this mean approx 409kbps UART Rx speed so my assumption is CPU works in pooling mode during reception to make this possible... Also H. Lyppens wrote that VBS on A500 is approx 40MB per hour so this is more on less inline with my estimation - 256 lines (1 byte per line), 50 frames per second - this gives 12800 bytes per second i.e. approx 40 MB per hr. For your 4 bytes per line this gives us 180MB per hr.
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16 March 2024, 13:54 | #58 | |
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It probably has error correction or data is repeated or something. |
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16 March 2024, 14:15 | #59 |
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You are right - i see it here
[ Show youtube player ]
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16 March 2024, 16:09 | #60 |
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By modernizing the idea, higher resolutions, piping raw data pixelated through 'ffmpeg' or similar, it should be possible to use YouTube as free public cloud storage then?
-"What are you watching?" -"TOSEC..." |
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