TPDD client

A "TPDD client", also usually called a dos*, is a program the runs on the portable and can read and write files on a Tandy Portable Disk Drive, or Tandy Portable Disk Drive 2, or any of their rebadged versions like Brother FB-100 and Purple Computing disk drive, or any "TPDD server", software which runs on a pc and emulates a TPDD.

To use a real TPDD or TPDD2, you need the special cable that comes with the drive, or a new cable that has the same electronics inside.

TPDD#Cable

https://www.arcadeshopper.com/wp/?page_id=11#!/Special-serial-cable-for-Tandy-Portable-Disk-Drive-and-Tandy-Portable-Disk-Drive-2/p/144969001/category=28313042

To use a TPDD server / TPDD emulator, you need a different special serial cable.

Model_T_Serial_Cable

Here are some of the major dos's for Model T computers:

• floppy The official DOS that came with the TPDD
• flopy2 The official DOS that came with the TPDD2
• TS-DOS Travelling Software's DOS
• Teeny The smallest DOS
• DSKMGR An early alternative dos that works like standard floppy/flopy2, also available for Kyotronic KC-85 and Olivetti M-10.
• Power-DOS / Power-Disk An early alternative dos that is more full-featured and composed of a collection of several utilities, almost like a normal disk operating system like cp/m or ms-dos.
• Disk+ Commercial dos option-rom from PCSG.

(Not THE DOS as in MS-DOS, A dos, as in, a disk operating system, because there are several).