These are 720k disk images in raw format.  The disks should be labelled:

Msdos.dsk         MS-DOS - Startup & Operating
Utilitys.dsk      Utilities 02.01.01

These are the original disks for the 3000NL, BIOS ROM version 01.04.02
or above.  Per Tandy Faxback, the SETUP.COM program on the DOS disk
must NOT be used on the 3000NL.  Instead, boot with the Utilities disk 
to enter setup.
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