[Coco] Copying a data/binary file from disk to cassette

[Phil]

Hi, all --

What's the best way of copying a non-BASIC file, like a .bin, from 
disk to cassette?  I tried COPY but setting a value of -1 returns a 
function error (COPY "FILE.BIN:0" TO "FILE.BIN:-1")...and I was never 
very good at GET, PUT, DSKI$, and all that.

I've got some data files on floppy, associated with various programs, 
that I'd like to transfer to my laptop (via cassette adapter).  And 
going in the other direction, I'd like to turn some .bins I have on 
disk images into WAVs so that, again going via the cassette adapter, 
I can try out some games and such on real hardware.

Obviously one way would be to use CSAVEM, though I don't know how to 
determine the correct memory addresses from which to start and end, 
and I don't think that would work for non-executable data files 
(would it?).

So, what's the best route?  I feel like I'm missing something 
obvious, so forgive me if I'm being slow here...

Thanks --
Phil

P.S.  I got some unexpected results when I CLOADed BASIC files 
written for Coco 3 (and turned into WAV files to export/import via 
cassette adapter) into an emulated Coco 1.  Specifically, all the 
Coco 3 commands in the programs, like HSCREEN, became exclamation 
marks!  Fortunately, I just reimported the WAV into an emulated Coco 
3 and made my disk images that way, but I'm surprised that the Coco 
would edit the programs on the fly, though I guess I can imagine why 
that would be.