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CBM disk drives took responsibility for the filesystem. Reading and writing files were simple serial transactions between the computer and the drive. This is why you could turn on the machine and just type LOAD"*",8,1 and it would load the first file on disk.

Atari disk drives had a microprocessor, but it was limited to reading and writing by sector. Atari computers had disk routines, but they were limited to reading the first few sectors from disk and loading enough code to boot the rest of the disk. To access a filesystem, a DOS had to be loaded into memory. There were multiple filesystems, and not all were compatible with each other.

With these two competing paradigms in play, designing a way to save to disk is going to be difficult.

Options as I see them:

• create some serial adapter to connect real CBM disk drives, and adapt CBM's I/O directly
• adapt Atari's sector-based I/O protocol, AND write a filesystem around it, to use Atari disk drives.

After loading the XEX file version and pressing RESET should should stay in ATARI64 if possible

The advantage of saving or loading to a tape or audio device, is that you don't have to worry about filesystems.

The disadvantage is that it won't be fast, and not a lot of people in retro computing still have working tape drives.

Implementation options:

• Build a Datasette adapter to some Atari port, and adapt CBM's tape code directly to use it.
• Adapt CBM's tape code to work with Atari Program Recorders.
• Adapt Atari's tape code.

I can't do it myself; I don't have a working tape drive for either system at the moment.

``At least using Altirra emulator, haven't tested on a real machine. It does not break the execution.

There was no INPUT routine running when I tested it.
Just something like 10 PRINT"HELLO World" and 20 GOTO 10.

Hello, great work!

I have found a bug:
Changing colors does not work.

Like:
PRINT "{RED}Hello World
does not change the cursor color.

Also, poking 646,X does not change the color, but I expected that.