Hi all. So I have a TI-99/4A and a Tunnels of Doom cart. I no longer have the tape but have downloaded the .wav file. I picked up a new old-stock (unopened) audio cable and have a tape recorder (TI "data recorder") coming in the mail in a few days. Meanwhile it occurred to me that I should be able to just play the audio out of another computer, my cellphone, an MP3 player, or something like that and it should work.
My first attempt was to simply plug the cable into my Galaxy S9 but strangely it didn't fit. Next I connected my phone to a bluetooth speaker with a line out jack and plugged the TI's audio cable into that but it wouldn't load. Next I plugged the TI's audio cable into a notebook computer and played the .WAV from there with the same result (the Tunnels of Doom game said "error - no data found" after about 30 seconds of waiting)
The only things that come to mind are:
1) the audio cable is clearly mono so maybe these stereo jacks aren't going to work correctly with a mono plug
2) maybe the "tone" adjustment on the "data recorder" is more important than I thought and playing out of a cell phone or computer with nothing but a volume control isn't going to work
3) maybe my .wav file is bad (though it sounds good to my ear)
It seems to me that it shouldn't be too picky on the audio quality, after-all the audio quality of a cassette tape can vary greatly depending on the tape, the player, and the age of both.
Also (and I'm really dusting off old brain cells here) but I seem to remember when the tape was playing I could hear it. Was it that the tape recorder's speaker would work even while the line-out jack was plugged in or was it that the TI would pipe the audio out to the TV? Today I am not able to hear it so if the TI is supposed to pipe the audio out to the TV then maybe my new old-stock cable is bad.