## H.4. Some Zmodem Usage Notes

You can invoke `sz` with a special terminal test mode:

>     $ sz -TT

This form of invocation causes `sz` to output all 256 8-bit character code combinations to your terminal. If you are having problems transferring files intact, this command lets you isolate the character codes that are being trapped by the operating systems.

Calling an RZSZ utility from most versions of the UUCP `cu` usually fails, because most `cu` implementations contend for characters from the modem with RZSZ tools. (C-Kermit apparently now can call RZSZ, but this is a new feature we haven't tried.)

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