shift+control+tab + B: I was referring to the 4.8 MyBIOS.
Since you are now on 4.9: all is transferred to the HELP-key.
Then press B to toggle internal BASIC on/off.
(Remember to use 'C'oldstart after toggling BASIC)
So, with OPTION, you use the internal BASIC build into your atari (*).
When you select from the cartridge, you "insert" a cartridge containing BASIC.
Does not matter much, except with the internal BASIC, you could use the 8k RAM that is beneath it.
But that require some programming skills
Yep, using the rescue loader is the trick. Nice.
I was coming to that in my next post.
Need to know first what OS you were running.
Perhaps you want to create an extra partition and assign that to D2: or something like that.
Save your work there and keep D1: for boot-strapping and system-files.
Later,
Sijmen.
*) Atari 600XL,800XL and all XE's