C64 Birthday logo jam in SuperPET APL

Instructions: To run, use a version of Vice with -superpet option, like WinVICE-3.0-x64. 

Load a Vice xpet session launched as follows:  

xpet +sound -truedrive -superpet -cpu6809 -model SuperPET -drive8type 8050 -9 sp9000lang.d80

Type "apl" at the Waterloo microSystems menu prompt to launch Waterloo microAPL. Then load the workspace using

 )LOAD DISK/1.LOGOJAM

note:  the ) key is the shifted ' key

The APL workspace functions can be listed with )FNS and array variables listed by typing  )VARS. 

Type LOGO to just print the logo. 

Type DEMO to run the full demo. 

The demo will run on a continuous loop.