From the manual, it looks like a Microchip PM8712 [1].

[1] PDF Data sheet: https://ww1.microchip.com/downloads/aemDocuments/documents/D...

Context: https://support.google.com/store/answer/3036017

Interestingly, Windows' ftp.exe is BSD-derived also:

http://everything2.com/title/BSD+Code+in+Windows

It was rewritten from scratch in Vista.

The Windows 7 version of ftp.exe still has a University of California copyright string buried inside it...

So it seems.

Well, I was just stating the information I had.