diff --git a/autobrake_test.p8 b/autobrake_test.p8
index 39dc680..a000557 100644
--- a/autobrake_test.p8
+++ b/autobrake_test.p8
@@ -43,21 +43,27 @@ end
 function _init()
  pal(1,129,1)
  the_ship = ship.new()
- slomo = 0
+ constraints:setup()
+ slomo = 1
  sloc = 0
  reroll()
 end
 
 function reroll()
+ frames=0
+ sloc=0
  the_ship:reroll()
 end
 
 function _update60()
  if (btnp(4)) reroll()
- slomo += btnp(2) and -1 or btnp(3) and 1 or 0
- slomo = (slomo < 0) and 0 or (slomo > 60) and 60 or slomo
+ if (btnp(5)) constraints:cycle()
+ if (btnp(3)) slomo <<= 1
+ if (btnp(2)) slomo >>= 1
+ slomo = (slomo < 1) and 1 or (slomo > 8192) and 8192 or slomo
  sloc += 1
- if sloc > slomo then
+ if sloc >= slomo then
+  frames += 1
   the_ship:update()
   sloc=0
  end
@@ -65,7 +71,33 @@ end
 
 function _draw()
  cls(1)
+ constraints:draw()
  the_ship:draw()
+ print("frames: " .. frames, 4, 64, 7)
+ print("speed: 1/" .. slomo, 8, 70, 7)
+
+ print("thrust: ".. actual_t, 4, 80, 7)
+ meter(80, 80, 128, 84, actual_t/the_ship.thrust/2)
+ print("dx: ".. the_ship.dx, 20, 86, 7)
+ meter(80, 86, 128, 90, the_ship.dx/the_ship.maxspd/2)
+ print("x: "..the_ship.x, 24, 92, 7)
+
+ print("xmin:"..tostr(constraints.xmin), 12, 102, 7)
+ print("xmax:"..tostr(constraints.xmax), 12, 108, 7)
+end
+
+function meter(x0, y0, x1, y1, frac)
+ local c = 11
+ if frac < 0 then
+  frac = -frac
+  c = 8
+ end
+ local range = x1-x0
+ local midpoint = x0 + (range/2)
+ rectfill(x0, y0-1, x0, y1+1, 13)
+ rectfill(midpoint, y0-1, midpoint, y1 + 1, 13)
+ local width = range * frac
+ if (width ~= 0) rectfill(x0, y0, x0 + width, y1, c)
 end
 
 -->8
@@ -99,7 +131,7 @@ end
 function ship:update()
  local t = btn(0) and -1 or btn(1) and 1 or 0
  t *= self.thrust
- t = constrain(self, t)
+ t = constraints:constrain(self, t)
  local s,lim=self.dx+t,self.maxspd
  local sg = sgn(s)
  s -= sg*self.drag
@@ -109,6 +141,7 @@ function ship:update()
  self.x += s
  self.dx = s
  self:add_sparks(t)
+ actual_t = t
 end
 
 function ship:add_sparks(t)
@@ -117,10 +150,44 @@ end
 -->8
 -- constraints
 
-function constrain(s, want)
+constraints = {
+ ymin=20,
+ ymax=52,
+}
+
+function constraints:constrain(s, want)
  return want
 end
 
+function constraints:cycle()
+ if self.ctype=="bounds" then
+  self.ctype="point"
+ elseif self.ctype=="point" then
+  self.ctype="off"
+ else
+  self.ctype="bounds"
+ end
+ self:setup()
+end
+
+function constraints:setup()
+ if self.ctype=="point" then
+  self.xmin = 64
+  self.xmax = 64
+ elseif self.ctype=="bounds" then
+  self.xmin = 32
+  self.xmax = 96
+ else
+  self.xmin = nil
+  self.xmax = nil
+ end
+end
+
+function constraints:draw()
+ if (not self.xmin) return
+ rect(self.xmin, self.ymin, self.xmax, self.ymax, 10)
+end
+
 -->8
 -- fx