INKEY With Negative values

[StefanMyczko]

INKEY does not appear to support the option to use negative numbers to check if a particular key is being pressed, it looks as if its treating the negative as just a large number and waiting a long time before continuing.

From https://www.bbcbasic.co.uk/bbcwin/tutorial/chapter13.html

INKEY (not INKEY$) has an extended functionality in that it can be used to test for individual keys being pressed. To do this, we give it a negative argument. The table of values used to represent the required key is not related to the ASCII code and is given in full in the help files under INKEY / INKEY$. When used in this way, it returns immediately with a value of TRUE (–1) or FALSE (0) depending on whether the required key was pressed. Again, this is really good for games:

[breakintoprogram]

Closing as this is a duplicate of #56