diff --git a/doc/notes.txt b/doc/notes.txt
index e4c19516..cf09c0c5 100644
--- a/doc/notes.txt
+++ b/doc/notes.txt
@@ -6,7 +6,10 @@ TODO:
 - confuse code/data in listing
 - show memory locations hovering over lines
 - don't check against ROM signatures
-- DASM: macro forward refs
+- DASM
+  - macro forward refs
+  - labels start with . omit timing info (isCode)
+  - spaces in filename don't parse code listing (DASM, maybe more)
 - asm: support macro expansion
 - multiple breakpoints, expression breakpoints
 - watchpoints
@@ -31,7 +34,6 @@ TODO:
 - click to break on raster position
 - restructure src/ folders
 - debug bankswitching for funky formats
-- spaces in filename don't parse code listing (DASM, maybe more)
 - 'undefined' for bitmap replacer
 - requestInterrupt needs to be disabled after breakpoint?
 - C/asm source formatter
@@ -123,6 +125,7 @@ TODO:
   - separate Scope View
 - single-stepping vector games makes screen fade
 - break on stack overflow, illegal op, bad access, BRK, etc
+  - show in scope instead?
 - nes
   - replay doesn't work for nes (force background tile redraw)
   - nes debug view toolbar
@@ -179,6 +182,7 @@ TODO:
   - can't step back twice?
   - compiler bug in chase
 - "shared" in URL doesn't work, leave in URL? (also importURL)
+- segments disappear in memory map when binary unchanged
 
 - TypeError: null is not an object (evaluating 'n.destination')
   https://8bitworkshop.com/v3.4.1/javatari.js/release/javatari/javatari.js
@@ -307,6 +311,23 @@ Assets come from:
 - structured data (palette, sprites, metasprites, levels, etc)
 - think about new comment format, platform-specific types
 
+Programmatic Asset Language
+- load PNG, draw image, or generate bitmap font
+- split into images
+- paletteize
+- fit into tileset/spriteset
+  - NES: 8x8 or 8x16 tiles
+  - 7800: 256xN slice
+  - VCS: 24xN playfield, 8xN sprite, 32xN big sprite
+- generate data file (asm/c/bin)
+- generate char mapping
+- tile generator (makechr-like)
+- metasprites too
+- RLE compression
+- check constraints
+
+
+---
 
 Github Support
 
diff --git a/package-lock.json b/package-lock.json
index 8d4f4ae8..67b45651 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1819,6 +1819,12 @@
         "tough-cookie": "^2.3.3"
       }
     },
+    "rgbquant": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/rgbquant/-/rgbquant-1.1.2.tgz",
+      "integrity": "sha1-2V6Imo/LHmwaT6LMyL46QaL80YU=",
+      "dev": true
+    },
     "rimraf": {
       "version": "2.7.1",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
diff --git a/package.json b/package.json
index 52a2aa77..b0a8a9ca 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,7 @@
     "nightwatch": "^1.2.1",
     "octokat": "^0.10.0",
     "pngjs": "^3.3.3",
+    "rgbquant": "^1.1.2",
     "typescript": "^3.6.2",
     "typescript-formatter": "^7.2.2"
   },
diff --git a/presets/atari7800/chr_font.s b/presets/atari7800/chr_font.s
new file mode 100644
index 00000000..e5bef3f2
--- /dev/null
+++ b/presets/atari7800/chr_font.s
@@ -0,0 +1,518 @@
+
+;;{w:8,h:16,bpp:2,count:128,brev:1,flip:1,remap:[0,8,9,10,11,1,2,3,4,5,6,7]};;
+.segment "CHR0"
+
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $55,$55,$00,$00,$55,$55,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$14,$05,$50,$55,$55,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$05,$50
+.byte $00,$00,$05,$50,$00,$00,$55,$55
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$15,$50
+.byte $00,$00,$00,$00,$15,$40,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $14,$00,$00,$14,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$55,$00,$00,$00,$00,$00
+.byte $01,$40,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $55,$55,$00,$00,$55,$55,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$14,$14,$14,$55,$55,$00,$00
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+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $01,$40,$00,$00,$00,$00,$00,$00
+.byte $00,$50,$05,$00,$00,$00,$00,$00
+.byte $01,$40,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
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+.byte $00,$00,$00,$00,$00,$00,$00,$00
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+.byte $14,$00,$00,$14,$00,$00,$00,$00
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+.byte $00,$00,$00,$00,$00,$00,$00,$00
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+.byte $14,$00,$14,$14,$14,$14,$14,$14
+.byte $01,$40,$14,$14,$05,$50,$05,$14
+.byte $14,$14,$01,$40,$14,$00,$05,$00
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+.byte $01,$50,$04,$44,$04,$44,$01,$40
+.byte $54,$15,$14,$14,$41,$41,$50,$50
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+.byte $15,$40,$01,$54,$15,$54,$00,$00
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+.byte $14,$14,$01,$40,$14,$14,$14,$50
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+.byte $00,$00,$00,$00,$14,$00,$00,$00
+.byte $00,$14,$00,$00,$05,$00,$00,$00
+.byte $14,$00,$00,$00,$00,$00,$14,$00
+.byte $01,$40,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $05,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$01,$40
+.byte $01,$40,$01,$40,$51,$45,$05,$50
+.byte $00,$00,$50,$05,$55,$55,$00,$00
+.byte $00,$00,$00,$40,$00,$40,$00,$00
+.byte $55,$55,$00,$00,$55,$55,$00,$55
+.byte $05,$50,$05,$54,$05,$55,$01,$40
+.byte $14,$00,$00,$14,$01,$40,$14,$14
+.byte $01,$55,$05,$50,$00,$00,$01,$40
+.byte $01,$40,$01,$40,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$01,$40,$15,$54
+.byte $00,$00,$01,$40,$14,$14,$05,$14
+.byte $05,$50,$51,$40,$05,$40,$01,$40
+.byte $00,$50,$05,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$14
+.byte $01,$54,$00,$50,$05,$50,$05,$50
+.byte $05,$00,$15,$54,$01,$50,$15,$54
+.byte $05,$50,$05,$50,$00,$00,$00,$00
+.byte $00,$14,$00,$00,$14,$00,$05,$50
+.byte $15,$54,$01,$40,$15,$50,$05,$50
+.byte $15,$40,$15,$54,$15,$54,$05,$50
+.byte $14,$14,$05,$50,$00,$14,$14,$14
+.byte $14,$00,$14,$05,$14,$05,$05,$50
+.byte $15,$50,$05,$50,$15,$50,$05,$50
+.byte $15,$54,$14,$14,$14,$14,$14,$05
+.byte $14,$14,$14,$14,$15,$54,$05,$50
+.byte $14,$00,$05,$50,$14,$14,$00,$00
+.byte $00,$50,$00,$00,$14,$00,$00,$00
+.byte $00,$14,$00,$00,$01,$54,$00,$00
+.byte $14,$00,$01,$40,$00,$50,$14,$00
+.byte $15,$40,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $05,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$50
+.byte $01,$40,$05,$00,$15,$01,$01,$40
+.byte $00,$00,$15,$54,$15,$54,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $55,$55,$00,$00,$55,$55,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $01,$40,$15,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$05,$50,$00,$00
+.byte $01,$40,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$01,$40,$00,$50,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $55,$55,$00,$00,$55,$55,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $01,$40,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$01,$40,$00,$00
+.byte $05,$40,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $55,$55,$00,$00,$55,$55,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $55,$55,$00,$00,$55,$55,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+.byte $00,$00,$00,$00,$00,$00,$00,$00
+
+;; 4096 bytes
diff --git a/presets/atari7800/dlist.c b/presets/atari7800/dlist.c
new file mode 100644
index 00000000..86d23f14
--- /dev/null
+++ b/presets/atari7800/dlist.c
@@ -0,0 +1,59 @@
+
+#include "atari7800.h"
+
+#include <string.h>
+
+byte DL[16][64];
+
+DLLEntry DLL[16];
+
+//#link "chr_font.s"
+
+char* hello = "\2\4\6\0\220\222\102";
+
+void setup_dll() {
+  byte i;
+  // set up DLL
+  byte* dlptr = &DL[0][0];
+  DLLEntry *dll = &DLL[0];
+  for (i=0; i<16; i++) {
+    dll->offset_flags = DLL_H16 | (16-1);
+    dll->dl_hi = (word)dlptr>>8;
+    dll->dl_lo = (byte)dlptr;
+    dlptr += sizeof(DL[0]);
+    dll++;
+  }
+  memset(DL, 0, sizeof(DL));
+}
+
+void main() {
+
+  setup_dll();
+  
+  // set up display list
+  {
+    DL5Entry dl5;
+    dl5.data_hi = (word)hello>>8;
+    dl5.data_lo = (word)hello;
+    dl5.flags = DL5_INDIRECT;
+    dl5.width_pal = 32-8;
+    dl5.xpos = 32;
+    memcpy(DL[2], &dl5, sizeof(dl5));
+  }
+
+  // activate DMA
+  MARIA.CHARBASE = 0x80;
+  MARIA.DPPH = (word)DLL>>8;
+  MARIA.DPPL = (byte)DLL;
+  MARIA.CTRL = CTRL_DMA_ON | CTRL_DBLBYTE | CTRL_160AB;
+  MARIA.P0C1 = 0x2f;
+  MARIA.P0C2 = 0x1f;
+  MARIA.P0C3 = 0xf;
+
+  while (1) {
+    while ((MARIA.MSTAT & MSTAT_VBLANK) == 0) ;
+    while ((MARIA.MSTAT & MSTAT_VBLANK) != 0) ;
+    MARIA.BACKGRND = 0;
+    DL[2][4]++;
+  }
+}
diff --git a/scripts/sync-version-prod.sh b/scripts/sync-version-prod.sh
index 99588cd8..b54bee28 100755
--- a/scripts/sync-version-prod.sh
+++ b/scripts/sync-version-prod.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-. ./scripts/env.sh
-VERSION=`git tag | tail -1`
-#VERSION=`git tag -l HEAD`
+#. ./scripts/env.sh
+#VERSION=`git tag | tail -1`
+VERSION=`git tag -l --points-at HEAD`
 if [ "$VERSION" == "" ]; then
   echo "No version at HEAD! Tag it first!"
   exit 1
diff --git a/src/devices.ts b/src/devices.ts
index d6d78a3e..825834a2 100644
--- a/src/devices.ts
+++ b/src/devices.ts
@@ -186,6 +186,7 @@ export interface ProbeTime {
 export interface ProbeCPU {
   logExecute(address:number);
   logInterrupt(type:number);
+  logIllegal(address:number);
 }
 
 export interface ProbeBus {
@@ -218,6 +219,7 @@ export class NullProbe implements ProbeAll {
   logIOWrite()		{}
   logVRAMRead()		{}
   logVRAMWrite()	{}
+  logIllegal()		{}
 }
 
 /// CONVENIENCE
diff --git a/src/machine/atari7800.ts b/src/machine/atari7800.ts
index 3e8f771b..fa0c4b80 100644
--- a/src/machine/atari7800.ts
+++ b/src/machine/atari7800.ts
@@ -162,6 +162,8 @@ class MARIA {
     }
   }
   readDLLEntry(bus) {
+    // display lists must be in RAM (TODO: probe?)
+    if (this.dll >= 0x4000) { return; }
     let x = bus.read(this.dll);
     this.offset = (x & 0xf);
     this.h16 = (x & 0x40) != 0;
@@ -204,6 +206,8 @@ class MARIA {
         let b0 = bus.read(dlhi + ((dlofs+0) & 0x1ff));
         let b1 = bus.read(dlhi + ((dlofs+1) & 0x1ff));
         if (b1 == 0) break; // end of DL
+        // display lists must be in RAM (TODO: probe?)
+        if (dlhi >= 0x4000) { break; }
         let b2 = bus.read(dlhi + ((dlofs+2) & 0x1ff));
         let b3 = bus.read(dlhi + ((dlofs+3) & 0x1ff));
         let indirect = false;
@@ -335,7 +339,7 @@ export class Atari7800 extends BasicMachine implements RasterFrameBased {
         [0x1800, 0x27ff, 0xffff, (a) => { return this.ram[a - 0x1800]; }],
         [0x2800, 0x3fff,  0x7ff, (a) => { return this.read(a | 0x2000); }], // shadow
         [0x4000, 0xffff, 0xffff, (a) => { return this.rom ? this.rom[a - 0x4000] : 0; }],
-        [0x0000, 0xffff, 0xffff, (a) => { return 0; }], // TODO
+        [0x0000, 0xffff, 0xffff, (a) => { return this.probe && this.probe.logIllegal(a); }],
       ]);
     this.write = newAddressDecoder([
         [0x0015, 0x001A,   0x1f, (a,v) => { this.xtracyc++; this.pokey1.setTIARegister(a, v); }],
@@ -348,7 +352,7 @@ export class Atari7800 extends BasicMachine implements RasterFrameBased {
         [0x1800, 0x27ff, 0xffff, (a,v) => { this.ram[a - 0x1800] = v; }],
         [0x2800, 0x3fff,  0x7ff, (a,v) => { this.write(a | 0x2000, v); }], // shadow
         [0xbfff, 0xbfff, 0xffff, (a,v) => { }], // TODO: bank switching?
-        [0x0000, 0xffff, 0xffff, (a,v) => { throw new EmuHalt("Write @ " + hex(a,4) + " " + hex(v,2)); }],
+        [0x0000, 0xffff, 0xffff, (a,v) => { this.probe && this.probe.logIllegal(a); }],
       ]);
     this.connectCPUMemoryBus(this);
     this.probeDMABus = this.probeIOBus(this);
@@ -357,7 +361,14 @@ export class Atari7800 extends BasicMachine implements RasterFrameBased {
     this.audioadapter = new TssChannelAdapter(this.pokey1, audioOversample, audioSampleRate);
   }
   
-  readConst(a) { return this.read(a); } //TODO?
+  readConst(a) {
+    // make sure we don't log during this
+    let oldprobe = this.probe;
+    this.probe = null;
+    let v = this.read(a);
+    this.probe = oldprobe;
+    return v;
+  }
 
   readInput(a:number) : number {
     switch (a) {
diff --git a/src/platform/verilog.ts b/src/platform/verilog.ts
index bca42bb1..0601de99 100644
--- a/src/platform/verilog.ts
+++ b/src/platform/verilog.ts
@@ -352,10 +352,6 @@ var VerilogPlatform = function(mainElement, options) {
   start() {
     video = new RasterVideo(mainElement,videoWidth,videoHeight,{overscan:true});
     video.create();
-    var ctx = video.getContext();
-    ctx.font = "8px TinyFont";
-    ctx.fillStyle = "white";
-    ctx.textAlign = "left";
     poller = setKeyboardFromMap(video, switches, VERILOG_KEYCODE_MAP, (o,key,code,flags) => {
       if (flags & KeyFlags.KeyPress) {
         keycode = code | 0x80;
diff --git a/src/recorder.ts b/src/recorder.ts
index 1d1bae25..e737ff1d 100644
--- a/src/recorder.ts
+++ b/src/recorder.ts
@@ -192,6 +192,7 @@ export enum ProbeFlags {
   VRAM_READ	= 0x06000000,
   VRAM_WRITE	= 0x07000000,
   INTERRUPT	= 0x08000000,
+  ILLEGAL	= 0x09000000,
   SCANLINE	= 0x7e000000,
   FRAME		= 0x7f000000,
 }
@@ -284,6 +285,9 @@ export class ProbeRecorder implements ProbeAll {
   logVRAMWrite(address:number, value:number) {
     this.log(address | ProbeFlags.VRAM_WRITE);
   }
+  logIllegal(address:number) {
+    this.log(address | ProbeFlags.ILLEGAL);
+  }
 
 }
 
diff --git a/src/views.ts b/src/views.ts
index 237de5cd..17fdaf5d 100644
--- a/src/views.ts
+++ b/src/views.ts
@@ -1074,6 +1074,7 @@ abstract class ProbeBitmapViewBase extends ProbeViewBase {
       case ProbeFlags.VRAM_READ:	s = "VRAM Read"; break;
       case ProbeFlags.VRAM_WRITE:	s = "VRAM Write"; break;
       case ProbeFlags.INTERRUPT:	s = "Interrupt"; break;
+      case ProbeFlags.ILLEGAL:		s = "Error"; break;
       default:				s = ""; break;
     }
     return typeof addr == 'number' ? s + " " + this.addr2str(addr) : s;
@@ -1100,6 +1101,7 @@ abstract class ProbeBitmapViewBase extends ProbeViewBase {
       case ProbeFlags.VRAM_READ:	return 0x808001;
       case ProbeFlags.VRAM_WRITE:	return 0x4080c0;
       case ProbeFlags.INTERRUPT:	return 0xcfcfcf;
+      case ProbeFlags.ILLEGAL:		return 0x3f3fff;
       default:				return 0;
     }
   }
diff --git a/src/worker/lib/atari7800/atari7800.cfg b/src/worker/lib/atari7800/atari7800.cfg
index ae62cb6b..ea14f75c 100644
--- a/src/worker/lib/atari7800/atari7800.cfg
+++ b/src/worker/lib/atari7800/atari7800.cfg
@@ -9,15 +9,24 @@ MEMORY {
     HEADER: file = %O, start = $0000, size = $0080, fill = yes;
 
     # ROM Bank
-    PRG: file = %O, start = $4000, size = $BFFA, fill = yes, define = yes;
+    PRG: file = %O, start = $4000, size = $4000, fill = yes, define = yes;
+
+    # DMA/Code Banks (interleaved for 4K Holey DMA)
+    CHR0: file = %O, start = $8000, size = $1000, fill = yes, define = yes;
+    PRG0: file = %O, start = $9000, size = $1000, fill = yes, define = yes;
+    CHR1: file = %O, start = $A000, size = $1000, fill = yes, define = yes;
+    PRG1: file = %O, start = $B000, size = $1000, fill = yes, define = yes;
+    CHR2: file = %O, start = $C000, size = $1000, fill = yes, define = yes;
+    PRG2: file = %O, start = $D000, size = $1000, fill = yes, define = yes;
+    CHR3: file = %O, start = $E000, size = $1000, fill = yes, define = yes;
+    PRG3: file = %O, start = $F000, size = $0FFA, fill = yes, define = yes;
 
     # CPU Vectors
     VECTORS: file = %O, start = $FFFA, size = $0006, fill = yes;
 
     # standard 2k SRAM (-zeropage)
-    # $0140-$0200 cpu stack
-    # $0500-$0800 3 pages for cc65 parameter stack
-    RAM:   file = "", start = $2200, size = __STACKSIZE__, define = yes;
+    RAM0: file = "", start = $1800, size = $840, define = yes;
+    RAM1: file = "", start = $2200, size = __STACKSIZE__, define = yes;
 }
 SEGMENTS {
     ZEROPAGE: load = ZP,              type = zp;
@@ -26,9 +35,18 @@ SEGMENTS {
     RODATA:   load = PRG,             type = ro,  define   = yes;
     ONCE:     load = PRG,             type = ro,  optional = yes;
     CODE:     load = PRG,             type = ro,  define   = yes;
-    DATA:     load = PRG, run = RAM,  type = rw,  define   = yes;
+    DATA:     load = PRG, run = RAM0, type = rw,  define   = yes;
+    CHR0:     load = CHR0,            type = ro,  optional = yes;
+    PRG0:     load = PRG0,            type = ro,  optional = yes;
+    CHR1:     load = CHR1,            type = ro,  optional = yes;
+    PRG1:     load = PRG1,            type = ro,  optional = yes;
+    CHR2:     load = CHR2,            type = ro,  optional = yes;
+    PRG2:     load = PRG2,            type = ro,  optional = yes;
+    CHR3:     load = CHR3,            type = ro,  optional = yes;
+    PRG3:     load = PRG3,            type = ro,  optional = yes;
     VECTORS:  load = VECTORS,         type = ro;
-    BSS:      load = RAM,             type = bss, define   = yes;
+    BSS:      load = RAM0,            type = bss, define   = yes;
+    RAM1:     load = RAM1,            type = rw,  optional = yes;
 }
 FEATURES {
     CONDES: type    = constructor,
diff --git a/src/worker/lib/atari7800/crt0.o b/src/worker/lib/atari7800/crt0.o
index b6fa3121..f30682bf 100644
Binary files a/src/worker/lib/atari7800/crt0.o and b/src/worker/lib/atari7800/crt0.o differ
diff --git a/src/worker/lib/atari7800/crt0.s b/src/worker/lib/atari7800/crt0.s
index b1f723d0..26e4e10c 100644
--- a/src/worker/lib/atari7800/crt0.s
+++ b/src/worker/lib/atari7800/crt0.s
@@ -6,9 +6,11 @@
 	.export _HandyRTI
 	.export	NMI,IRQ,START
 	.import initlib,push0,popa,popax,_main,zerobss,copydata
+	.importzp sp
 
 	; Linker generated symbols
-	.import __RAM_START__   ,__RAM_SIZE__
+	.import __RAM0_START__  ,__RAM0_SIZE__
+	.import __RAM1_START__  ,__RAM1_SIZE__
 	.import __ROM0_START__  ,__ROM0_SIZE__
 	.import __STARTUP_LOAD__,__STARTUP_RUN__,__STARTUP_SIZE__
 	.import	__CODE_LOAD__   ,__CODE_RUN__   ,__CODE_SIZE__
@@ -82,6 +84,15 @@ _exit:
         cpx     #$40
         bne     @3
 
+; copy data segment
+	jsr	copydata
+; initialize cc65 stack
+	lda	#<(__RAM1_START__+__RAM1_SIZE__)
+	sta	sp
+	lda	#>(__RAM1_START__+__RAM1_SIZE__)
+	sta	sp+1
+; init CC65 library
+	jsr	initlib
 ; set interrupt vector in ZP
 	lda	#<_HandyRTI
 	sta	INTVEC
diff --git a/tools/fonts/bitmap-fonts b/tools/fonts/bitmap-fonts
deleted file mode 120000
index c293b1b2..00000000
--- a/tools/fonts/bitmap-fonts
+++ /dev/null
@@ -1 +0,0 @@
-../../bitmap-fonts
\ No newline at end of file
diff --git a/tools/fonts/ibmfonts b/tools/fonts/ibmfonts
deleted file mode 120000
index 8689af2c..00000000
--- a/tools/fonts/ibmfonts
+++ /dev/null
@@ -1 +0,0 @@
-../../ibmfonts
\ No newline at end of file
diff --git a/tools/png2a7800.js b/tools/png2a7800.js
new file mode 100755
index 00000000..5b37d11b
--- /dev/null
+++ b/tools/png2a7800.js
@@ -0,0 +1,83 @@
+#!/usr/bin/env node
+
+var fs = require('fs'),
+    PNG = require('pngjs').PNG,
+    RgbQuant = require('rgbquant');
+
+var data = fs.readFileSync(process.argv[2]);
+var png = PNG.sync.read(data);
+q = new RgbQuant();
+q.colors = 4;
+q.sample(png.data);
+pal = q.palette(false, true);
+//console.log(q);
+
+function readfonttxt(s) {
+  var lines = s.split(/\r?\n/);// TODO
+}
+
+function remapBits(x, arr) {
+  if (!arr) return x;
+  var y = 0;
+  for (var i=0; i<arr.length; i++) {
+    var s = arr[i];
+    if (s < 0) {
+      s = -s-1;
+      y ^= 1 << s;
+    }
+    if (x & (1 << i)) {
+      y ^= 1 << s;
+    }
+  }
+  return y;
+}
+
+function reorder(arrin, remap) {
+    var out = [];
+    for (var i=0; i<arrin.length; i++) {
+      var j = remapBits(i, remap);
+      //console.log(i,j);
+      if (j >= arrin.length) throw i+" -> "+j+" >= "+arrin.length;
+      out.push(arrin[j] | 0);
+    }
+    return out;
+}
+
+function packbits(arrin, bpp, brev) {
+  var out = new Uint8Array((arrin.length * bpp) >> 3);
+  for (var i=0; i<arrin.length; i++) {
+    var j = (i * bpp) >> 3;
+    var s = (i * bpp) & 7;
+    if (brev) s = 8-bpp-s;
+    out[j] |= arrin[i] << s;
+  }
+  return out;
+}
+
+function hex(n) {
+  return (n < 16 ? "0" : "") + n.toString(16);
+}
+
+function dump(arr, bpl) {
+  var s = '';
+  for (var i=0; i<arr.length; i++) {
+    if (i % bpl == 0) {
+      s += '\n.byte ';
+    } else {
+      s += ',';
+    }
+    s += '$' + hex(arr[i]);
+  }
+  s += '\n';
+  return s;
+}
+
+idximg = q.reduce(png.data, 2);
+//idximg = idximg.slice(0, 8*16*128);
+//idximg = idximg.slice(8*16*64);
+idx2 = reorder(idximg, [0,1,2,3,4,5,6,11,12,13,-8,-9,-10,-11]); // 8x16 font
+//idx2 = reorder(idximg, [0,1,2,3,5,6,11,12,13,99,-8,-9,-10,-5]); // 8x16 CHR tileset
+idx3 = packbits(idx2, 2, true);
+//console.log(idximg.length, idx2.length, idx3.length);
+console.log(dump(idx3, 8));
+console.log(";;",idx3.length,"bytes,",pal.length/4,'colors');