21. Press space-bar to continue
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~
There are various ways of doing this. The first method looks at the keyboard
buffer, so if the Space-bar has been pressed just before the message, it will
carry straight on. If this is a problem, then either use the second variant
with the *FX21,0 buffer clear command, or use the third version. This will
still cause a Space to enter the keyboard buffer, so this is cleared with
*FX21,0 to avoid problems later.

Although written as Procedures, they don't have to be.
Call them with PROCspace.

 1000 DEFPROCspace:REPEAT UNTIL GET=32:ENDPROC

 1000 DEFPROCspace:*FX21,0
 1010 REPEAT UNTIL GET=32:ENDPROC

 1000 DEFPROCspace:REPEAT UNTIL INKEY(-99):*FX21,0
 1010 ENDPROC