[Coco] Xroar and tape emulation

[Ciaran Anscomb]

Allen Huffman wrote:
> 
> The cassette emulation was tricky, since I needed to effectively rewind 
> and reuse a tape as I moved from EDITOR to ALLRAM. Xroar made this 
> difficult. I could ^W mount a writeable .CAS file, and save out the 
> message base, but I couldn't ^L load it since it was still a 0K file. I 
> had to create a temporary ^W writeable .CAS file, then it would flush out 
> the other, then I could ^L load it and use it. I had to repeat this step 
> if I wanted to save the data back to the same tape.

Hmm, yes, XRoar's approach isn't very good for that case (though it's
alright for the "load a program off one tape, same data out to another"
case).

I'll stick it on the list to consider a better interface for this sort
of thing.

..ciaran