American_Pi wrote:Well. That explains why I can't get my TS1000 to load from my Digital Olympus recorder.
It saves just fine. I get the old 0/0 after it's all done. Man was I excited when it saved, but boy was I disappointed when it didn't load.

Yeah, 0/0 after a SAVE only means the computer has finished outputting the tones to the outside world.
As said above, the output from a ZX81 is designed for the very sensitive Mic input on mono cassette recorders, where the cassette recorder manufacturer expected the user to be using a cheap microphone with low output...
Plus, modern audio devices have volume limited outputs, unlike the old mono cassette recorders (which were designed to use 8 ohm loud speakers and 8 ohm headphones).
But of course, you only normally discover that there is a problem when you try to LOAD it back in...
Mark