diff --git a/presets/vector-z80color/font.c b/presets/vector-z80color/font.c
new file mode 100644
index 00000000..00235248
--- /dev/null
+++ b/presets/vector-z80color/font.c
@@ -0,0 +1,212 @@
+
+#include <string.h>
+
+typedef unsigned char byte;
+typedef unsigned short word;
+
+void main();
+
+void start() {
+__asm
+        LD      SP,#0x0
+        DI
+__endasm;
+  main();
+}
+
+int dvgwrofs; // write offset for DVG buffer
+
+inline word ___swapw(word j) {
+  return ((j << 8) | (j >> 8));
+}
+
+word __at(0xa000) dvgram[0x1000];
+byte __at(0x8840) _dvgstart;
+
+inline void dvgreset() {
+  dvgwrofs = 0;
+}
+
+inline void dvgstart() {
+  _dvgstart = 0;
+}
+
+void dvgwrite(word w) {
+  dvgram[dvgwrofs++] = w;
+}
+
+inline void VCTR(int dx, int dy, byte bright) {
+  dvgwrite((dx & 0x1fff));
+  dvgwrite(((bright & 7) << 13) | (dy & 0x1fff));
+}
+
+inline void SVEC(signed char dx, signed char dy, byte bright) {
+  dvgwrite(0x4000 | (dx & 0x1f) | ((bright&7)<<5) | ((dy & 0x1f)<<8));
+}
+
+inline void JSRL(word offset) {
+  dvgwrite(0xa000 | offset);
+}
+
+inline void JMPL(word offset) {
+  dvgwrite(0xe000 | offset);
+}
+
+inline void RTSL() {
+  dvgwrite(0xc000);
+}
+
+inline void CNTR() {
+  dvgwrite(0x8000);
+}
+
+inline void HALT() {
+  dvgwrite(0x2000);
+}
+
+inline void STAT(byte rgb, byte intens) {
+  dvgwrite(0x6000 | ((intens & 0xf)<<4) | (rgb & 7));
+}
+
+inline void SCAL(word scale) {
+  dvgwrite(0x7000 | scale);
+}
+
+enum {
+  BLACK, BLUE, GREEN, CYAN, RED, MAGENTA, YELLOW, WHITE
+} Color;
+
+/// https://trmm.net/Asteroids_font
+
+#define P(x,y) ((((x) & 0xF) << 4) | (((y) & 0xF) << 0))
+#define FONT_UP 0xFE
+#define FONT_LAST 0xFF
+
+const byte vecfont[95][8] = {
+  ['0' - 0x20] = { P(0,0), P(8,0), P(8,12), P(0,12), P(0,0), P(8,12), FONT_LAST },
+  ['1' - 0x20] = { P(4,0), P(4,12), P(3,10), FONT_LAST },
+  ['2' - 0x20] = { P(0,12), P(8,12), P(8,7), P(0,5), P(0,0), P(8,0), FONT_LAST },
+  ['3' - 0x20] = { P(0,12), P(8,12), P(8,0), P(0,0), FONT_UP, P(0,6), P(8,6), FONT_LAST },
+  ['4' - 0x20] = { P(0,12), P(0,6), P(8,6), FONT_UP, P(8,12), P(8,0), FONT_LAST },
+  ['5' - 0x20] = { P(0,0), P(8,0), P(8,6), P(0,7), P(0,12), P(8,12), FONT_LAST },
+  ['6' - 0x20] = { P(0,12), P(0,0), P(8,0), P(8,5), P(0,7), FONT_LAST },
+  ['7' - 0x20] = { P(0,12), P(8,12), P(8,6), P(4,0), FONT_LAST },
+  ['8' - 0x20] = { P(0,0), P(8,0), P(8,12), P(0,12), P(0,0), FONT_UP, P(0,6), P(8,6), },
+  ['9' - 0x20] = { P(8,0), P(8,12), P(0,12), P(0,7), P(8,5), FONT_LAST },
+  [' ' - 0x20] = { FONT_LAST },
+  ['.' - 0x20] = { P(3,0), P(4,0), FONT_LAST },
+  [',' - 0x20] = { P(2,0), P(4,2), FONT_LAST },
+  ['-' - 0x20] = { P(2,6), P(6,6), FONT_LAST },
+  ['+' - 0x20] = { P(1,6), P(7,6), FONT_UP, P(4,9), P(4,3), FONT_LAST },
+  ['!' - 0x20] = { P(4,0), P(3,2), P(5,2), P(4,0), FONT_UP, P(4,4), P(4,12), FONT_LAST },
+  ['#' - 0x20] = { P(0,4), P(8,4), P(6,2), P(6,10), P(8,8), P(0,8), P(2,10), P(2,2) },
+  ['^' - 0x20] = { P(2,6), P(4,12), P(6,6), FONT_LAST },
+  ['=' - 0x20] = { P(1,4), P(7,4), FONT_UP, P(1,8), P(7,8), FONT_LAST },
+  ['*' - 0x20] = { P(0,0), P(4,12), P(8,0), P(0,8), P(8,8), P(0,0), FONT_LAST },
+  ['_' - 0x20] = { P(0,0), P(8,0), FONT_LAST },
+  ['/' - 0x20] = { P(0,0), P(8,12), FONT_LAST },
+  ['\\' - 0x20] = { P(0,12), P(8,0), FONT_LAST },
+  ['@' - 0x20] = { P(8,4), P(4,0), P(0,4), P(0,8), P(4,12), P(8,8), P(4,4), P(3,6) },
+  ['$' - 0x20] = { P(6,2), P(2,6), P(6,10), FONT_UP, P(4,12), P(4,0), FONT_LAST },
+  ['&' - 0x20] = { P(8,0), P(4,12), P(8,8), P(0,4), P(4,0), P(8,4), FONT_LAST },
+  ['[' - 0x20] = { P(6,0), P(2,0), P(2,12), P(6,12), FONT_LAST },
+  [']' - 0x20] = { P(2,0), P(6,0), P(6,12), P(2,12), FONT_LAST },
+  ['(' - 0x20] = { P(6,0), P(2,4), P(2,8), P(6,12), FONT_LAST },
+  [')' - 0x20] = { P(2,0), P(6,4), P(6,8), P(2,12), FONT_LAST },
+  ['{' - 0x20] = { P(6,0), P(4,2), P(4,10), P(6,12), FONT_UP, P(2,6), P(4,6), FONT_LAST },
+  ['}' - 0x20] = { P(4,0), P(6,2), P(6,10), P(4,12), FONT_UP, P(6,6), P(8,6), FONT_LAST },
+  ['%' - 0x20] = { P(0,0), P(8,12), FONT_UP, P(2,10), P(2,8), FONT_UP, P(6,4), P(6,2) },
+  ['<' - 0x20] = { P(6,0), P(2,6), P(6,12), FONT_LAST },
+  ['>' - 0x20] = { P(2,0), P(6,6), P(2,12), FONT_LAST },
+  ['|' - 0x20] = { P(4,0), P(4,5), FONT_UP, P(4,6), P(4,12), FONT_LAST },
+  [':' - 0x20] = { P(4,9), P(4,7), FONT_UP, P(4,5), P(4,3), FONT_LAST },
+  [';' - 0x20] = { P(4,9), P(4,7), FONT_UP, P(4,5), P(1,2), FONT_LAST },
+  ['"' - 0x20] = { P(2,10), P(2,6), FONT_UP, P(6,10), P(6,6), FONT_LAST },
+  ['\'' - 0x20] = { P(2,6), P(6,10), FONT_LAST },
+  ['`' - 0x20] = { P(2,10), P(6,6), FONT_LAST },
+  ['~' - 0x20] = { P(0,4), P(2,8), P(6,4), P(8,8), FONT_LAST },
+  ['?' - 0x20] = { P(0,8), P(4,12), P(8,8), P(4,4), FONT_UP, P(4,1), P(4,0), FONT_LAST },
+  ['A' - 0x20] = { P(0,0), P(0,8), P(4,12), P(8,8), P(8,0), FONT_UP, P(0,4), P(8,4) },
+  ['B' - 0x20] = { P(0,0), P(0,12), P(4,12), P(8,10), P(4,6), P(8,2), P(4,0), P(0,0) },
+  ['C' - 0x20] = { P(8,0), P(0,0), P(0,12), P(8,12), FONT_LAST },
+  ['D' - 0x20] = { P(0,0), P(0,12), P(4,12), P(8,8), P(8,4), P(4,0), P(0,0), FONT_LAST },
+  ['E' - 0x20] = { P(8,0), P(0,0), P(0,12), P(8,12), FONT_UP, P(0,6), P(6,6), FONT_LAST },
+  ['F' - 0x20] = { P(0,0), P(0,12), P(8,12), FONT_UP, P(0,6), P(6,6), FONT_LAST },
+  ['G' - 0x20] = { P(6,6), P(8,4), P(8,0), P(0,0), P(0,12), P(8,12), FONT_LAST },
+  ['H' - 0x20] = { P(0,0), P(0,12), FONT_UP, P(0,6), P(8,6), FONT_UP, P(8,12), P(8,0) },
+  ['I' - 0x20] = { P(0,0), P(8,0), FONT_UP, P(4,0), P(4,12), FONT_UP, P(0,12), P(8,12) },
+  ['J' - 0x20] = { P(0,4), P(4,0), P(8,0), P(8,12), FONT_LAST },
+  ['K' - 0x20] = { P(0,0), P(0,12), FONT_UP, P(8,12), P(0,6), P(6,0), FONT_LAST },
+  ['L' - 0x20] = { P(8,0), P(0,0), P(0,12), FONT_LAST },
+  ['M' - 0x20] = { P(0,0), P(0,12), P(4,8), P(8,12), P(8,0), FONT_LAST },
+  ['N' - 0x20] = { P(0,0), P(0,12), P(8,0), P(8,12), FONT_LAST },
+  ['O' - 0x20] = { P(0,0), P(0,12), P(8,12), P(8,0), P(0,0), FONT_LAST },
+  ['P' - 0x20] = { P(0,0), P(0,12), P(8,12), P(8,6), P(0,5), FONT_LAST },
+  ['Q' - 0x20] = { P(0,0), P(0,12), P(8,12), P(8,4), P(0,0), FONT_UP, P(4,4), P(8,0) },
+  ['R' - 0x20] = { P(0,0), P(0,12), P(8,12), P(8,6), P(0,5), FONT_UP, P(4,5), P(8,0) },
+  ['S' - 0x20] = { P(0,2), P(2,0), P(8,0), P(8,5), P(0,7), P(0,12), P(6,12), P(8,10) },
+  ['T' - 0x20] = { P(0,12), P(8,12), FONT_UP, P(4,12), P(4,0), FONT_LAST },
+  ['U' - 0x20] = { P(0,12), P(0,2), P(4,0), P(8,2), P(8,12), FONT_LAST },
+  ['V' - 0x20] = { P(0,12), P(4,0), P(8,12), FONT_LAST },
+  ['W' - 0x20] = { P(0,12), P(2,0), P(4,4), P(6,0), P(8,12), FONT_LAST },
+  ['X' - 0x20] = { P(0,0), P(8,12), FONT_UP, P(0,12), P(8,0), FONT_LAST },
+  ['Y' - 0x20] = { P(0,12), P(4,6), P(8,12), FONT_UP, P(4,6), P(4,0), FONT_LAST },
+  ['Z' - 0x20] = { P(0,12), P(8,12), P(0,0), P(8,0), FONT_UP, P(2,6), P(6,6), FONT_LAST },
+};
+
+////
+
+static int frame = 0;
+
+void draw_char(char ch) {
+  const byte* p = vecfont[ch-0x20];
+  byte bright = 0;
+  byte x = 0;
+  byte y = 0;
+  byte i;
+  for (i=0; i<8; i++) {
+    byte b = *p++;
+    if (b == FONT_LAST) break; // last move
+    else if (b == FONT_UP) bright = 0; // pen up
+    else {
+      byte x2 = b>>4;
+      byte y2 = b&15;
+      SVEC((char)(x2-x), (char)(y2-y), bright);
+      bright = 4;
+      x = x2;
+      y = y2;
+    }
+  }
+  SVEC((char)12-x, (char)-y, 0);
+}
+
+void draw_string(const char* str, byte spacing) {
+  while (*str) {
+    draw_char(*str++);
+    if (spacing) SVEC(spacing, 0, 0);
+  }
+}
+
+void main() {
+  dvgwrofs = 0x800;
+  draw_string("HELLO WORLD", 0);
+  RTSL();
+  while (1) {
+    dvgreset();
+    CNTR();
+    SCAL(0x7f);
+    //SCAL(frame & 0xff);
+    STAT(RED, 0);
+    VCTR(200, 200, 1);
+    VCTR(-200, 200, 3);
+    VCTR(-200, -200, 5);
+    VCTR(200, -200, 7);
+    CNTR();
+    STAT(GREEN, 0);
+    VCTR(100, -100, 0);
+    JSRL(0x800);
+    HALT();
+    dvgstart();
+    frame++;
+  }
+}
diff --git a/presets/vector-z80color/threed.c b/presets/vector-z80color/threed.c
new file mode 100644
index 00000000..ad8564e0
--- /dev/null
+++ b/presets/vector-z80color/threed.c
@@ -0,0 +1,249 @@
+#include <string.h>
+
+typedef unsigned char byte;
+typedef signed char sbyte;
+typedef unsigned short word;
+
+word __at(0xa000) dvgram[0x1000];
+byte __at(0x8840) _dvgstart;
+
+int __at(0x8100) mathbox_sum;
+sbyte __at(0x8102) mathbox_arg1;
+sbyte __at(0x8103) mathbox_arg2;
+byte __at(0x810f) mathbox_go_mul;
+
+//
+
+void main();
+
+void start() {
+__asm
+        LD      SP,#0x0
+        DI
+__endasm;
+  main();
+}
+
+int dvgwrofs; // write offset for DVG buffer
+
+inline word ___swapw(word j) {
+  return ((j << 8) | (j >> 8));
+}
+
+inline void dvgreset() {
+  dvgwrofs = 0;
+}
+
+inline void dvgstart() {
+  _dvgstart = 0;
+}
+
+void dvgwrite(word w) {
+  dvgram[dvgwrofs++] = w;
+}
+
+inline void VCTR(int dx, int dy, byte bright) {
+  dvgwrite((dx & 0x1fff));
+  dvgwrite(((bright & 7) << 13) | (dy & 0x1fff));
+}
+
+inline void SVEC(sbyte dx, sbyte dy, byte bright) {
+  dvgwrite(0x4000 | (dx & 0x1f) | ((bright&7)<<5) | ((dy & 0x1f)<<8));
+}
+
+inline void JSRL(word offset) {
+  dvgwrite(0xa000 | offset);
+}
+
+inline void JMPL(word offset) {
+  dvgwrite(0xe000 | offset);
+}
+
+inline void RTSL() {
+  dvgwrite(0xc000);
+}
+
+inline void CNTR() {
+  dvgwrite(0x8000);
+}
+
+inline void HALT() {
+  dvgwrite(0x2000);
+}
+
+inline void STAT(byte rgb, byte intens) {
+  dvgwrite(0x6000 | ((intens & 0xf)<<4) | (rgb & 7));
+}
+
+inline void STAT_sparkle(byte intens) {
+  dvgwrite(0x6800 | ((intens & 0xf)<<4));
+}
+
+inline void SCAL(word scale) {
+  dvgwrite(0x7000 | scale);
+}
+
+enum {
+  BLACK, BLUE, GREEN, CYAN, RED, MAGENTA, YELLOW, WHITE
+} Color;
+
+///
+
+typedef struct {
+  sbyte m[3][3];
+} Matrix;
+
+typedef struct {
+  sbyte x,y,z;
+} Vector8;
+
+typedef struct {
+  int x,y,z;
+} Vector16;
+
+typedef struct {
+  byte numverts;
+  const Vector8* verts; // array of vertices
+  const sbyte* edges; // array of vertex indices (edges)
+} Wireframe;
+
+void mat_identity(Matrix* m) {
+  memset(m, 0, sizeof(*m));
+  m->m[0][0] = 127;
+  m->m[1][1] = 127;
+  m->m[2][2] = 127;
+}
+
+inline void mul16(sbyte a, sbyte b) {
+  mathbox_arg1 = a;
+  mathbox_arg2 = b;
+  mathbox_go_mul=0;
+}
+
+void vec_mat_transform(Vector16* dest, const Vector8* v, const Matrix* m) {
+  byte i;
+  int* result = &dest->x;
+  const sbyte* mval = &m->m[0][0];
+  for (i=0; i<3; i++) {
+    mathbox_sum = 0;
+    mul16(*mval++, v->x);
+    mul16(*mval++, v->y);
+    mul16(*mval++, v->z);
+    *result++ = mathbox_sum;
+  }
+}
+
+/*
+void vec_mat_transform2(Vector16* dest, const Vector8* v, const Matrix* m) {
+  dest->x = v->x*m->m[0][0] + v->y*m->m[0][1] + v->z*m->m[0][2];
+  dest->y = v->x*m->m[1][0] + v->y*m->m[1][1] + v->z*m->m[1][2];
+  dest->z = v->x*m->m[2][0] + v->y*m->m[2][1] + v->z*m->m[2][2];
+}
+*/
+
+const sbyte sintbl[64] = {
+0, 3, 6, 9, 12, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46,
+49, 51, 54, 57, 60, 63, 65, 68, 71, 73, 76, 78, 81, 83, 85, 88,
+90, 92, 94, 96, 98, 100, 102, 104, 106, 107, 109, 111, 112, 113, 115, 116,
+117, 118, 120, 121, 122, 122, 123, 124, 125, 125, 126, 126, 126, 127, 127, 127,
+};
+
+sbyte isin(byte x0) {
+  byte x = x0;
+  if (x0 & 0x40) x = 127-x;
+  if (x0 & 0x80) {
+    return -sintbl[x+128];
+  } else {
+    return sintbl[x];
+  }
+}
+
+sbyte icos(byte x) {
+  return isin(x+64);
+}
+
+void mat_rotate(Matrix* m, byte axis, byte angle) {
+  sbyte sin = isin(angle);
+  sbyte cos = icos(angle);
+  mat_identity(m);
+  switch (axis) {
+    case 0:
+      m->m[1][1] = cos;
+      m->m[2][1] = sin;
+      m->m[1][2] = -sin;
+      m->m[2][2] = cos;
+      break;
+    case 1:
+      m->m[2][2] = cos;
+      m->m[0][2] = sin;
+      m->m[2][0] = -sin;
+      m->m[0][0] = cos;
+      break;
+    case 2:
+      m->m[0][0] = cos;
+      m->m[1][0] = sin;
+      m->m[0][1] = -sin;
+      m->m[1][1] = cos;
+      break;
+  }
+}
+
+const Vector8 tetra_v[] = { {0,-86,86},{86,86,86},{-86,86,86},{0,0,-86} };
+const char tetra_e[] = { 0, 1, 2, 0, 3, 1, -1, 3, 2, -2 };
+const Wireframe tetra = { 4, tetra_v, tetra_e };
+
+void xform_vertices(Vector16* dest, const Vector8* src, const Matrix* m, byte nv) {
+  byte i;
+  for (i=0; i<nv; i++) {
+    vec_mat_transform(dest++, src++, m);
+  }
+}
+
+void draw_wireframe_ortho(const Wireframe* wf, const Matrix* m) {
+  const char* e = wf->edges;
+  byte bright = 0;
+  int x1 = 0;
+  int y1 = 0;
+  Vector16 scrnverts[16];
+  xform_vertices(scrnverts, wf->verts, m, wf->numverts);
+  do {
+    sbyte i = *e++;
+    if (i == -1)
+      bright = 0;
+    else if (i == -2)
+      break;
+    else {
+      int x2 = scrnverts[i].x>>8;
+      int y2 = scrnverts[i].y>>8;
+      VCTR(x2-x1, y2-y1, bright);
+      x1 = x2;
+      y1 = y2;
+    }
+    bright = 2;
+  } while (1);
+}
+
+///
+
+word frame;
+
+void main() {
+  int x,y;
+  Matrix m;
+  mat_identity(&m);
+  while (1) {
+    dvgreset();
+    CNTR();
+    SCAL(0x1f);
+    STAT(RED, 5);
+    x = isin(frame/8);
+    y = icos(frame/8);
+    VCTR(x, y, 2);
+    STAT(GREEN, 15);
+    mat_rotate(&m, (frame>>8)&3, frame);
+    draw_wireframe_ortho(&tetra, &m);
+    HALT();
+    dvgstart();
+    frame++;
+  }
+}
diff --git a/src/emu.js b/src/emu.js
index 9c06441c..751c0a32 100644
--- a/src/emu.js
+++ b/src/emu.js
@@ -125,7 +125,7 @@ mainElement.appendChild(borderElement);
 var VectorVideo = function(mainElement, width, height) {
   var self = this;
   var canvas, ctx;
-  var persistenceAlpha = 0.5;
+  var persistenceAlpha = 0.8;
   var jitter = 1.0;
   var gamma = 0.8;
   var sx = width/1024.0;
diff --git a/src/platform/vector.js b/src/platform/vector.js
index f928e90b..39388cd3 100644
--- a/src/platform/vector.js
+++ b/src/platform/vector.js
@@ -4,6 +4,8 @@
 // http://arcarc.xmission.com/Tech/neilw_xy.txt
 
 var VECTOR_PRESETS = [
+  {id:'font.c', name:'Vector Fonts'},
+  {id:'threed.c', name:'3D Transformations'},
 ]
 
 var ASTEROIDS_KEYCODE_MAP = makeKeycodeMap([
@@ -316,6 +318,7 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
   var video, audio, timer;
   var clock;
   var switches = new RAM(16).mem;
+  var mathram = new RAM(16).mem;
 
   this.__proto__ = new BaseZ80Platform();
 
@@ -323,6 +326,18 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
     return VECTOR_PRESETS;
   }
 
+  function do_math() {
+    var sum = (((mathram[0] + (mathram[1]<<8)) << 16) >> 16);
+    var a = (mathram[2] << 24) >> 24;
+    var b = (mathram[3] << 24) >> 24;
+    var d = a!=0 ? (sum/a) : 0;
+    sum += (a*b) & 0xffff;
+    mathram[0] = sum & 0xff;
+    mathram[1] = (sum >> 8) & 0xff;
+    mathram[4] = d & 0xff;
+    mathram[5] = (d >> 8) & 0xff;
+  }
+
   this.start = function() {
     cpuram = new RAM(0x2000);
     dvgram = new RAM(0x4000);
@@ -332,6 +347,7 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
       read: new AddressDecoder([
         [0x0,    0x7fff, 0,      function(a) { return rom[a]; }],
         [0x8000, 0x800f, 0xf,    function(a) { return switches[a]; }],
+        [0x8100, 0x810f, 0xf,    function(a) { return mathram[a]; } ],
         [0xa000, 0xdfff, 0x3fff, function(a) { return dvgram.mem[a]; }],
         [0xe000, 0xffff, 0x1fff, function(a) { return cpuram.mem[a]; }],
       ]),
@@ -339,6 +355,8 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
       write: new AddressDecoder([
         [0x8000, 0x800f, 0xf,    function(a,v) { audio.pokey1.setRegister(a, v); }],
         [0x8010, 0x801f, 0xf,    function(a,v) { audio.pokey2.setRegister(a, v); }],
+        [0x8100, 0x810e, 0xf,    function(a,v) { mathram[a] = v; } ],
+        [0x810f, 0x810f, 0,      function(a,v) { do_math(); } ],
         [0x8840, 0x8840, 0,      function(a,v) { dvg.runUntilHalt(0); }],
         [0x8880, 0x8880, 0,      function(a,v) { dvg.reset(); }],
         [0xa000, 0xdfff, 0x3fff, function(a,v) { dvgram.mem[a] = v; }],
@@ -390,14 +408,16 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
 
   this.loadState = function(state) {
     cpu.loadState(state.c);
-    cpuram.mem.set(state.db);
+    cpuram.mem.set(state.cb);
     dvgram.mem.set(state.db);
+    mathram.set(state.mr);
   }
   this.saveState = function() {
     return {
       c:cpu.saveState(),
       cb:cpuram.mem.slice(0),
       db:dvgram.mem.slice(0),
+      mr:mathram.slice(0),
     }
   }
   this.getCPUState = function() {
@@ -524,8 +544,10 @@ var DVGColorStateMachine = function(bus, video, bofs) {
   var scale = 1.0;
   var color;
   var statz;
+  var sparkle;
   var pcstack = [];
   var running = false;
+
   bofs &= 0xffff;
 
   function readWord(a) {
@@ -543,6 +565,10 @@ var DVGColorStateMachine = function(bus, video, bofs) {
       return w;
   }
 
+  function sparkle_color() {
+    return (Math.random() * 256) & 0x7;
+  }
+
   this.reset = function() {
     pc = 0;
     scale = 1.0;
@@ -550,6 +576,7 @@ var DVGColorStateMachine = function(bus, video, bofs) {
     statz = 15;
     x = 512;
     y = 512;
+    sparkle = false;
     running = false;
   }
 
@@ -582,6 +609,7 @@ var DVGColorStateMachine = function(bus, video, bofs) {
         if (z == 2) z = statz;
         var x2 = x + Math.round(decodeSigned(w2, 12) * scale);
         var y2 = y + Math.round(decodeSigned(w, 12) * scale);
+        if (sparkle) color = sparkle_color();
         video.drawLine(x, y, x2, y2, z<<4, color);
         x = x2;
         y = y2;
@@ -595,19 +623,21 @@ var DVGColorStateMachine = function(bus, video, bofs) {
         var y2 = y + Math.round(decodeSigned(w>>8, 4) * scale * 2);
         var z = (w >> 5) & 0x7;
         if (z == 2) z = statz;
+        if (sparkle) color = sparkle_color();
         video.drawLine(x, y, x2, y2, z<<4, color);
         x = x2;
         y = y2;
         break;
       }
       case 3: { // STAT/SCAL
-        if (w & 0x1000) {
+        if (w & 0x1000) { // SCAL
           var b = ((w >> 8) & 0x07)+8;
           var l = (~w) & 0xff;
           scale = ((l << 16) >> b) / 32768.0;
-        } else {
+        } else { // STAT
           color = w & 7;
           statz = (w >> 4) & 0xf;
+          sparkle = (w & 0x800) != 0;
         }
         break;
       }
diff --git a/src/ui.js b/src/ui.js
index 09c19e3c..5185f0bc 100644
--- a/src/ui.js
+++ b/src/ui.js
@@ -359,12 +359,11 @@ function arrayCompare(a,b) {
   return true;
 }
 
-worker.onmessage = function(e) {
-  if (pendingWorkerMessages > 1) {
-    pendingWorkerMessages = 0;
-    setCode(editor.getValue());
+function setCompileOutput(data) {
+  sourcefile = new SourceFile(data.lines);
+  if (data.asmlines) {
+    assemblyfile = new SourceFile(data.asmlines, data.intermediate.listing);
   }
-  pendingWorkerMessages = 0;
   // errors?
   var toolbar = $("#controls_top");
   function addErrorMarker(line, msg) {
@@ -378,15 +377,11 @@ worker.onmessage = function(e) {
     div.appendChild(tooltip);
     editor.setGutterMarker(line, "gutter-info", div);
   }
-  sourcefile = new SourceFile(e.data.lines);
-  if (e.data.asmlines) {
-    assemblyfile = new SourceFile(e.data.asmlines, e.data.intermediate.listing);
-  }
-  if (e.data.errors.length > 0) {
+  if (data.errors.length > 0) {
     toolbar.addClass("has-errors");
     editor.clearGutter("gutter-info");
     var numLines = editor.lineCount();
-    for (info of e.data.errors) {
+    for (info of data.errors) {
       var line = info.line-1;
       if (line < 0 || line >= numLines) line = numLines-1;
       addErrorMarker(line, info.msg);
@@ -395,7 +390,7 @@ worker.onmessage = function(e) {
   } else {
     updatePreset(current_preset_id, editor.getValue()); // update persisted entry
     // load ROM
-    var rom = e.data.output;
+    var rom = data.output;
     var rom_changed = rom && !arrayCompare(rom, current_output);
     if (rom_changed) {
       try {
@@ -419,7 +414,7 @@ worker.onmessage = function(e) {
       editor.clearGutter("gutter-bytes");
       editor.clearGutter("gutter-offset");
       editor.clearGutter("gutter-clock");
-      for (var info of e.data.lines) {
+      for (var info of data.lines) {
         if (info.offset >= 0) {
           var textel = document.createTextNode(hex(info.offset,4));
           editor.setGutterMarker(info.line-1, "gutter-offset", textel);
@@ -447,6 +442,15 @@ worker.onmessage = function(e) {
   trace_pending_at_pc = null;
 }
 
+worker.onmessage = function(e) {
+  if (pendingWorkerMessages > 1) {
+    pendingWorkerMessages = 0;
+    setCode(editor.getValue());
+  }
+  pendingWorkerMessages = 0;
+  setCompileOutput(e.data);
+}
+
 function setCurrentLine(line) {
   editor.setSelection({line:line,ch:0}, {line:line-1,ch:0}, {scroll:true});
 }
diff --git a/src/worker/workermain.js b/src/worker/workermain.js
index 32edfac1..223da7d2 100644
--- a/src/worker/workermain.js
+++ b/src/worker/workermain.js
@@ -614,19 +614,22 @@ function assemblelinkSDASZ80(code, platform) {
     var asmlines = parseListing(lstout, /^\s*([0-9A-F]+)\s+([0-9A-F][0-9A-F r]*[0-9A-F])\s+\[([0-9 ]+)\]\s+(\d+) (.*)/i, 4, 1, 2, 5, 3);
     var srclines = parseSourceLines(lstout, /^\s+\d+ ;<stdin>:(\d+):/i, /^\s*([0-9A-F]{4})/i);
     // parse symbol map
+    /*
     var symbolmap = {};
+    console.log(mapout);
     for (var s of mapout.split("\n")) {
       var toks = s.split(" ");
       if (s[0] == 'DEF') {
         symbolmap[s[1]] = s[2];
       }
     }
+    */
     return {
       output:parseIHX(hexout, params.code_start, params.code_size),
       lines:asmlines,
       srclines:srclines,
       errors:msvc_errors, // TODO?
-      symbolmap:symbolmap,
+      symbolmap:mapout,
       intermediate:{listing:rstout},
     };
   }
diff --git a/test/cli/6502/test6502disasm.js b/test/cli/6502/test6502disasm.js
index 0c92ee0b..eb8b8542 100644
--- a/test/cli/6502/test6502disasm.js
+++ b/test/cli/6502/test6502disasm.js
@@ -14,7 +14,7 @@ describe('6502 disassembler', function() {
     assert.deepEqual({line:"BRK ",nbytes:1}, disassemble6502(0, 0, 0, 0));
     assert.deepEqual({line:"LDA #$A9",nbytes:2}, disassemble6502(0, 0xa9, 0xa9, 0xa9));
     assert.deepEqual({line:"JMP $6010",nbytes:3}, disassemble6502(0, 0x4c, 0x10, 0x60));
-    assert.deepEqual({line:"BPL $FFF0",nbytes:2}, disassemble6502(0, 0x10, 0xf0, 0));
-    assert.deepEqual({line:"BMI $0010",nbytes:2}, disassemble6502(0, 0x30, 0x10, 0));
+    assert.deepEqual({line:"BPL $FFF2",nbytes:2}, disassemble6502(0, 0x10, 0xf0, 0));
+    assert.deepEqual({line:"BMI $0012",nbytes:2}, disassemble6502(0, 0x30, 0x10, 0));
   });
 });