Chuck Guzis wrote about the Epson QX10 and Valdocs:
I believe the Forth thing extended to their clone
CP/M, called TP/M.
There are some subtle differences between the two. Done by a San
Franscisco outfit, with a name like "Friends-Amis"?
Not sure about their involvement with the QX10, but they developed the
Matsushita (Panasonic and Quasar) HHC, which was 6502-based. Much of
the software for the HHC was written in SNAP, which was a token-threaded
dialect of Forth. Unless you have the extremely rare SNAP FORTH module,
SNAP is not exposed to the user.
There was also a SNAP BASIC module, which contained a BASIC interpreter
written in SNAP. This is NOT the same as the Microsoft BASIC module,
which was a port of Microsoft's normal 6502 BASIC, very similar to the
KIM-1 version.