diff --git a/doc/notes.txt b/doc/notes.txt
index 91761029..b90697df 100644
--- a/doc/notes.txt
+++ b/doc/notes.txt
@@ -46,6 +46,7 @@ TODO:
 - show tool-specific (readonly) include files
 - verilog debugging makes it slow
 - fix VCS mame
+- checkmarks for active window
 
 
 WEB WORKER FORMAT
diff --git a/presets/verilog/ball_slip_counter.v b/presets/verilog/ball_slip_counter.v
index 0d9b7045..aa6d078c 100644
--- a/presets/verilog/ball_slip_counter.v
+++ b/presets/verilog/ball_slip_counter.v
@@ -9,17 +9,19 @@ module ball_slip_counter_top(clk, reset, hsync, vsync, rgb);
   wire display_on;
   wire [8:0] hpos;
   wire [8:0] vpos;
+  reg ball_reset;
   
+  // 9-bit ball timers
   reg [8:0] ball_htimer;
   reg [8:0] ball_vtimer;
   
-  // motion codes
+  // 4-bit motion codes
   reg [3:0] ball_horiz_move;
   reg [3:0] ball_vert_move;
 
-  // stop codes
-  localparam ball_horiz_stop = 4'd12;
-  localparam ball_vert_stop = 4'd11;
+  // 4-bit stop codes
+  localparam ball_horiz_stop = 4'd11;
+  localparam ball_vert_stop = 4'd10;
 
   // 5-bit constants to load into counters
   localparam ball_horiz_prefix = 5'b01100; // 192
@@ -36,11 +38,10 @@ module ball_slip_counter_top(clk, reset, hsync, vsync, rgb);
   );
   
   // update horizontal timer
-  always @(posedge clk or posedge reset) begin
-    if (reset || ball_htimer == 0) begin
-      if (reset) // center-ish of screen
-        ball_htimer <= {5'b11000, ball_horiz_move};
-      else if (ball_vtimer == 0) // nudge ball in horiz. dir
+  always @(posedge clk or posedge ball_reset)
+  begin
+    if (ball_reset || &ball_htimer) begin
+      if (ball_reset || &ball_vtimer) // nudge ball in horiz. dir
         ball_htimer <= {ball_horiz_prefix, ball_horiz_move};
       else // reset timer but don't move ball horizontally
         ball_htimer <= {ball_horiz_prefix, ball_horiz_stop};
@@ -49,15 +50,22 @@ module ball_slip_counter_top(clk, reset, hsync, vsync, rgb);
   end
 
   // update vertical timer
-  always @(posedge hsync or posedge reset)
+  always @(posedge hsync or posedge ball_reset)
   begin
-    if (reset) // center-ish of screen
-      ball_vtimer <= {5'b11000, ball_vert_move};
-    else if (ball_vtimer == 0) // reset timer
+    if (ball_reset || &ball_vtimer) // reset timer
       ball_vtimer <= {ball_vert_prefix, ball_vert_move};
     else
       ball_vtimer <= ball_vtimer + 1;
   end
+
+  // reset ball position
+  always @(posedge clk or posedge reset)
+    begin
+      if (reset)
+        ball_reset <= 1;
+      else if (hpos == 128 && vpos == 128)
+        ball_reset <= 0;
+    end
   
   // collide with vertical and horizontal boundaries
   wire ball_vert_collide = ball_vgfx && vpos >= 240;
@@ -67,18 +75,18 @@ module ball_slip_counter_top(clk, reset, hsync, vsync, rgb);
   always @(posedge ball_vert_collide or posedge reset)
   begin
     if (reset)
-      ball_vert_move <= 4'd10;
+      ball_vert_move <= 4'd9;
     else
-      ball_vert_move <= 4'b0110 ^ ball_vert_move; // change dir.
+      ball_vert_move <= (4'd9 ^ 4'd11) ^ ball_vert_move; // change dir.
   end
 
   // horizontal bounce
   always @(posedge ball_horiz_collide or posedge reset)
   begin
     if (reset)
-      ball_horiz_move <= 4'd11;
+      ball_horiz_move <= 4'd10;
     else
-      ball_horiz_move <= 4'b0110 ^ ball_horiz_move; // change dir.
+      ball_horiz_move <= (4'd10 ^ 4'd12) ^ ball_horiz_move; // change dir.
   end
 
   // compute ball display
diff --git a/src/baseplatform.ts b/src/baseplatform.ts
index d47b159f..cb5f383f 100644
--- a/src/baseplatform.ts
+++ b/src/baseplatform.ts
@@ -119,7 +119,7 @@ function getToolForFilename_6502(fn:string) : string {
   return "dasm"; // .a
 }
 
-abstract class Base6502Platform extends BaseDebugPlatform {
+export abstract class Base6502Platform extends BaseDebugPlatform {
 
   newCPU(membus : MemoryBus) {
     var cpu = new jt.M6502();
@@ -284,7 +284,7 @@ function BusProbe(bus : MemoryBus) {
   }
 }
 
-abstract class BaseZ80Platform extends BaseDebugPlatform {
+export abstract class BaseZ80Platform extends BaseDebugPlatform {
 
   _cpu;
   probe;
@@ -421,7 +421,7 @@ function getToolForFilename_z80(fn) {
 declare var FS, ENV, Module; // mame emscripten
 
 // TODO: make class
-var BaseMAMEPlatform = function() {
+export function BaseMAMEPlatform() {
 
   var self = this;
 
diff --git a/src/worker/workermain.js b/src/worker/workermain.js
index 3d8699b2..ac14c9d7 100644
--- a/src/worker/workermain.js
+++ b/src/worker/workermain.js
@@ -1158,17 +1158,18 @@ function compileInlineASM(code, platform, options, errors, asmlines) {
 function compileVerilator(step) {
   loadNative("verilator_bin");
   loadGen("worker/verilator2js");
-  var code = step.code;
   var platform = step.platform || 'verilog';
   var errors = [];
   var asmlines = [];
-  code = compileInlineASM(code, platform, step, errors, asmlines);
+  step.code = compileInlineASM(step.code, platform, step, errors, asmlines);
+  var code = step.code;
   var match_fn = makeErrorMatcher(errors, /%(.+?): (.+?:)?(\d+)?[:]?\s*(.+)/i, 3, 4);
   var verilator_mod = verilator_bin({
     instantiateWasm: moduleInstFn('verilator_bin'),
     noInitialRun:true,
     print:print_fn,
     printErr:match_fn,
+    //TOTAL_MEMORY:64*1024*1024,
   });
   var topmod = detectTopModuleName(code);
   var FS = verilator_mod['FS'];
diff --git a/test/cli/testworker.js b/test/cli/testworker.js
index 00a832f9..03355d0f 100644
--- a/test/cli/testworker.js
+++ b/test/cli/testworker.js
@@ -165,6 +165,23 @@ describe('Worker', function() {
     doBuild(msgs, done2, 2782, 0, 0);
   });
   it('should compile verilog inline assembler (JSASM)', function(done) {
+    var csource = ab2str(fs.readFileSync('presets/verilog/racing_game_cpu.v'));
+    var dependfiles = ["hvsync_generator.v", "sprite_bitmap.v", "sprite_renderer.v", "cpu8.v"];
+    var depends = [];
+    for (var dfile of dependfiles) {
+      var code = ab2str(fs.readFileSync('presets/verilog/' + dfile));
+      depends.push({filename:dfile, data:code, prefix:"verilog"});
+    }
+    var msgs = [{code:csource, platform:"verilog", tool:"verilator", dependencies:depends, path:'racing_game_cpu.v'}];
+    var done2 = function(err, msg) {
+      var jscode = msg.output.code;
+      var fn = new Function(jscode);
+      assert.ok(fn);
+      done(err, msg);
+    };
+    doBuild(msgs, done2, 49317, 0, 0);
+  });
+  it('should compile verilog assembler file (JSASM)', function(done) {
     var csource = ab2str(fs.readFileSync('presets/verilog/test2.asm'));
     var dependfiles = ["hvsync_generator.v", "font_cp437_8x8.v", "ram.v", "tile_renderer.v", "sprite_scanline_renderer.v", "lfsr.v", "sound_generator.v", "cpu16.v", "cpu_platform.v"];
     var depends = [];