SCRATCH can only delete a single file/pattern

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although the DOS2.x 4040/8050 manual states that you can do

Sdrv:name,drv:name, ...,drv:name

interestingly with ": alone means 'last drive accessed', with drv refers to the specified drive, where not used means 'both drives'"
I doubt that "both drives" makes sense in xs1541, where we usually say "last drive accessed"...
Also what happens when there is a "," in a file name - which is not allowed on CBM DOS, but normal in other file systems?

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See also #41