Nope - No joy.

As I say the problem is the stripping of the NULs, I have seen these replaced with CR's LF,s etc in the past due to protocol considerations (7 bit 8 bit etc) and know that NULs are favorite targets for compression techniques (along with spaces) but these are often single NULs. Telnet is a suspect but I can find no direct reference to this problem besides I'm pretty sure termcap/terminfo must use NULs.

I have tested with VT100, sco-ansi & wy50 emulations with no difference in outcome - Netterm has the option to capture the print data to file so I have no trouble running a hex editor on it and as I say NOT a NUL in sight!!.

Thx for the ref I will fire this off to netterm support & see what they say.