Hi Charles,
there's a bug in the latest oxygen.dll
older dll, date  o3.18.2o15  works.
include "asm.inc"
window 1024,800,1
single c, pc, clr, p, cm, x, y
for p=1 to 9600 step 0.1
    pc +=1 
    c  +=0.01
    cm = c/2.6
    x  = cos(rad(p)) * (cm/c)*c 
    y  = sin(rad(p)) * (cm/c)*c 
    color clr+12, clr-pc, clr+pc
    fillcircle x+1024/2, y+800/2, 20
    color clr+1, clr-pc, clr+pc
    fillcircle x+1024/2, y+800/2, 20
    clr +=1
    if clr > 20 then clr=1
next
waitkey
winEnd
.