Timeline for Sharp EL-5500III (PC-1403) cassette tape encoding
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 14, 2020 at 16:33 | vote | accept | Brian | ||
| Jun 14, 2020 at 16:33 | comment | added | Brian | Thank you. Pocket-tools did it. It required the full 8 sec lead-in 4KHz tone, and then worked. wav2bin.exe -p1403 audio.wav basic.txt. I'll tear into source code later. | |
| Jun 14, 2020 at 14:39 | comment | added | Andy Walls | I put a link to the pocket tools software in the top of my edited answer. Don't bother generating controlled outputs for me. | |
| Jun 14, 2020 at 14:18 | comment | added | Brian | @ Andy I'll generate controlled output test cases as soon as I can. In the meantime, I can't find what you mean by "Pocket-tools". Posted Octave output graphs in original posting, above. | |
| Jun 14, 2020 at 2:58 | comment | added | Andy Walls | @Brian check out the Pocket-tools source code. | |
| Jun 14, 2020 at 2:56 | history | edited | Andy Walls | CC BY-SA 4.0 |
added 262 characters in body
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| Jun 14, 2020 at 0:29 | comment | added | Andy Walls | Ok. Write a short program that has 3 statements: 10 print "0123456789"; 20 print "ABCDEFGHIJKLMNOP"; 30 END. And CSAVE that and capture it. The hexadecimal representation of those ASCII characters will hopefully be easy to spot. | |
| Jun 13, 2020 at 23:59 | comment | added | Brian | Andy, The audio comes from the CSAVE function of a Sharp EL5500iii calculator/computer. I have come to agree that the periodicity argues against NRZI. The minimodem demodulation matches manually the first 20 bits or so when I use Audacity to zoom in on the waveform. I was unaware of Octave - I will go learn more because I always liked the concise matrix ops of MatLab. | |
| Jun 12, 2020 at 22:35 | history | answered | Andy Walls | CC BY-SA 4.0 |