Harken back to the days of DOS.

I have an embedded DOS handheld device, and I'm looking for a tool to manage the files stored on it. I picture an application I can launch on the device that opens COM1 up for commands to get a directory listing, send/receive files via x/y/zmodem, move/delete files, and create/move/delete directories.

A Windows application can then download a recursive file listing and then manage those files (for example, synchronizing with a local directory).

Keep in mind that this is DOS -- 8.3 filenames, 640K of RAM and a 19200bps serial link (yuk!). I'd prefer something with source in case we need to add additional features (for example, the ability to get a checksum of a file for change detection).

Now that I've written this description, I realize I'm asking for something like LapLink or pcAnywhere. Norton no longer sells DOS versions of pcAnywhere and LapLink V for DOS seems pricy at $50.

Are you aware of any similar apps from those good old days?