Messages in this thread | | | Date | Mon, 14 Sep 1998 12:59:20 -0700 | From | Peter Monta <> | Subject | Re: NEWSFLASH! Linux ported to Commodore VIC-20!! |
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> > How much data would an audio tape be able to carry? Are we talking a > > few hundred kilobytes or are we in the megabyte range? > > On a CBM64 with fastloader, 50K took about 2 minutes. So a C-90 tape gives you > about 2 MB.
Hm, 3 kbit/sec. Soundcard/tape has high SNR and is quite linear; one could use some V.34-like QAM/TCM scheme but at a higher symbol rate. If V.34 can get 30 kbit/sec from a phone line, surely a tape deck with 15 kHz bandwidth would roughly quadruple this, giving around 80 MByte per 90-min tape. Would want to interleave to control dropouts.
I wonder how fast such tape recorders could go if you stripped off the linear stuff. Just talk to the write head directly (with a bit on the parallel port say); would need an amplifier on the read end, with the machine sitting in a tight loop watching the transitions (some RLL channel code, or maybe even PRML with a small A/D).
Cheers, Peter Monta pmonta@imedia.com Imedia Corp.
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