If you'd like MEX to not clear your screen after a "R" or "S"
function, which is handy if the remote has printed the number of blocks
to be sent, you can modify MEX as follows.
POKE $0DEF 0 <-- To disable clear screen
POKE $0DEF 1 <-- To enable clear screen
Then simply clone mex "CLONE MEX.COM" to save the change!
