tape "load and save" to a PC/Mac

-----Oorspronkelijk bericht----- Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] Namens Cameron Kaiser Verzonden: woensdag 18 november 2009 7:37 Aan: cctalk at classiccmp.org Onderwerp: tape "load and save" to a PC/Mac I'm working on a Tomy Tutor tape decoder because, well, no one else is. To that end, this weekend I managed to crack the encoding and now have a primitive tape decoder that reads an AIFF audio file and spits out bits for a higher-level decoder to process. To date I can now see the bit pattern for the GRAPHIC paintbox, and can even do rudimentary decoding of BASIC programs. So far so good. However, playing back that exact uncompressed 44.1kHz 16-bit mono AIFF into the Tutor doesn't work (before you ask, the Tutor's tape inputs are mono). The Tutor doesn't see the sync mark, and never loads the "tape." I recorded this a few times, making sure that all the output got on the audio file, and no dice. I also played with line levels and varied the output volume level through all the fine steps the Mac would let me step, and the Tutor just sits there. Have people discovered any gotchas in general about using PC audio files to load and save from tape, besides the obvious ones like don't compress, etc.? Any suggestions about how to make the Mac's output more acceptable to the Tutor? -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- Adore, v.: To venerate expectantly. -- Ambrose Bierce ----------------------