Looking at the TRS-80 Disk Software Page, there's a rather extensive selection of DOS options that seem to work with the 4P and also claim high compatibility with the Tandy "TRSDOS" option.
Considering that I have a 4P with two floppy drives, and I'd like to run Model III and Model 4 native software (not CP/M), is there a particular DOS which is considered superior? I think my main criteria are compatibility, ease-of-use, and easy booting into both Model 4 and Model III modes. The 4P has no Model III ROM, so the DOS needs to support disk loading it for compatibility with Model III programs.
Note: I'm not concerned about Y2K compatibility.