RND

As I'm trying to get the programs at the classic basic games webpage to run on the ZX-jen I needed the RND() function. Unlike the old RND() functions, which return floating point numbers, which would require me to add floating point or at least fixed point methods to my code, I decided to create an integer version of RND() in which the parameter indicates the limit to be returned. So if RND(14) is called, it returns a random number between 0 and 13. It actually accepts an expression between the parenthesis, although since the PICmicro has only 8 depths of recursion it could go wrong at some point. Soon I will be able to show you the first program running under the ZX-jen.

Upon attempting to enter the first program I discovered that I need to implement the - operation, as well as some form of delay, because the screen is small and often scrolls over before everything is displayed. Of course, I can code the delay manually, but then GOSUB suddenly becomes important.