Hold Down the [F11] key and type "RSHIFT". If you have been successful a random message from VAL will drop down - This means you can now use the right shift key while cheating.
Repeat the code to toggle the effect on and off.
Use Once = traditional 256x192 pixel Spectrum mode.
Twice = high-res Spectrum mode
(i.e. using whatever rez you chose).
Thrice = back to normal.