I made this for the unexpanded VIC-20:   
      
   0 def fn   
   l(i)=a%(y-i,x-i)+a%(y-i,x)+a%(y-i,x+i)+a%(y,x-i)+a%(y,x+i)+a%(y+i,x-i)+a%(y+i,x   
   )+a%(y+o,x+o):poke36879,8:tr%=20:tc%=21:dim   
   a%(tr%,tc%),b%(tr%,tc%):h=.22:o=1:sr%=3:er%=18:ec%=19:c=.:g%=.:c1=2:c2=3:gosub   
   1000   
   1 for y=.to tr%:for x=.to tc%:a%(y,x)=b%(y,x):if a%(y,x)=.then print" ";:goto 3   
   2 print"*";   
   3 next x,y:print "generation:";g%;"{home}";:g%=g%+o:for y=o to tr%-o:for x=o to   
    tc%-o:c=.:c=fn l(o):if a%(y,x)=o and c<>c1and c<>c2then b%(y,x)=.:goto 5   
   4 if a%(y,x)=.and c=c2then b%(y,x)=o   
   5 next x,y:if g%<32768 then goto 1   
   6 goto6:donkeysoft   
   1000 print"{clear}{green}pet colonies, based   upon space colony by  tim   
   hartnell circa    1983 in turn based    upon conway's         game of   
   life{home}";:for y=sr% to er%:for x=sr% to ec%:b%(y,x)=rnd(.)+h:next x,y:return   
      
   Programmed with CBM PRG Studio.   
      
   The Commodore C64/128 version is here ->   
   https://github.com/sbebbers/PET-Colonies#pet-colonies-64-for-the-commodore-6412   
   8-and-compatibles   
      
   Obviously, with it being BASIC, it's quite slow. Although with an accelerator   
   and BLITZ BASIC it's pretty quick.   
      
   Regards,   
      
   Shaun   
      
   --- SoupGate-Win32 v1.05   
    * Origin: SpaceSST BBS Usenet  Fidonet Gateway (255:255/999)