diff --git a/embed.html b/embed.html
index da60e0ee..b5405b2f 100644
--- a/embed.html
+++ b/embed.html
@@ -88,6 +88,7 @@ function require(modname) {
 <script src="gen/devices.js"></script>
 <script src="gen/cpu/MOS6502.js"></script>
 <script src="gen/cpu/ZilogZ80.js"></script>
+<script src="gen/machine/vdp_z80.js"></script>
 
 <script src="lib/liblzg.js"></script>
 
diff --git a/index.html b/index.html
index ef600ecb..4f6c691c 100644
--- a/index.html
+++ b/index.html
@@ -546,6 +546,7 @@ function require(modname) {
 <script src="gen/devices.js"></script>
 <script src="gen/cpu/MOS6502.js"></script>
 <script src="gen/cpu/ZilogZ80.js"></script>
+<script src="gen/machine/vdp_z80.js"></script>
 
 <script>
 // submenus open on click + hover
diff --git a/src/cpu/ZilogZ80.ts b/src/cpu/ZilogZ80.ts
index 4b1eff6e..3a2b58cc 100644
--- a/src/cpu/ZilogZ80.ts
+++ b/src/cpu/ZilogZ80.ts
@@ -1730,6 +1730,9 @@ export class Z80 implements CPU, InstructionBased, IOBusConnected, SavesState<Z8
   interrupt(itype:number) {
     this.cpu.requestInterrupt(itype);
   }
+  NMI() {
+    this.cpu.nonMaskableInterrupt();
+  }
   getSP() {
     return this.cpu.getSP();
   }
diff --git a/src/machine/coleco.ts b/src/machine/coleco.ts
new file mode 100644
index 00000000..492361c4
--- /dev/null
+++ b/src/machine/coleco.ts
@@ -0,0 +1,155 @@
+
+import { Z80, Z80State } from "../cpu/ZilogZ80";
+import { BasicScanlineMachine } from "../devices";
+import { BaseZ80VDPBasedMachine } from "./vdp_z80";
+import { KeyFlags, newAddressDecoder, padBytes, Keys, makeKeycodeMap, newKeyboardHandler } from "../emu";
+import { hex, lzgmini, stringToByteArray } from "../util";
+import { TssChannelAdapter, MasterAudio, SN76489_Audio } from "../audio";
+import { TMS9918A } from "../video/tms9918a";
+
+// http://www.colecovision.eu/ColecoVision/development/tutorial1.shtml
+// http://www.colecovision.eu/ColecoVision/development/libcv.shtml
+// http://www.kernelcrash.com/blog/recreating-the-colecovision/2016/01/27/
+// http://www.atarihq.com/danb/files/CV-Tech.txt
+// http://www.atarihq.com/danb/files/CV-Sound.txt
+// http://www.colecoboxart.com/faq/FAQ05.htm
+// http://www.theadamresource.com/manuals/technical/Jeffcoleco.html
+// http://bifi.msxnet.org/msxnet//tech/tms9918a.txt
+// http://www.colecovision.dk/tools.htm?refreshed
+// http://www.theadamresource.com/manuals/technical/ColecoVision%20Coding%20Guide.pdf
+// http://www.unige.ch/medecine/nouspikel/ti99/tms9918a.htm
+// http://map.grauw.nl/articles/vdp_tut.php
+// http://www.msxcomputermagazine.nl/mccw/91/msx1demos1/en.html
+// http://www.segordon.com/colecovision.php
+// http://samdal.com/svvideo.htm
+// https://github.com/tursilion/convert9918
+// http://www.harmlesslion.com/cgi-bin/showprog.cgi?ColecoVision
+
+var COLECOVISION_KEYCODE_MAP = makeKeycodeMap([
+  [Keys.UP, 0, 0x1],
+  [Keys.DOWN, 0, 0x4],
+  [Keys.LEFT, 0, 0x8],
+  [Keys.RIGHT, 0, 0x2],
+  [Keys.A, 0, 0x40],
+  [Keys.B, 1, 0x40],
+
+  [Keys.P2_UP, 2, 0x1],
+  [Keys.P2_DOWN, 2, 0x4],
+  [Keys.P2_LEFT, 2, 0x8],
+  [Keys.P2_RIGHT, 2, 0x2],
+  [Keys.P2_A, 2, 0x40],
+  [Keys.P2_B, 3, 0x40],
+]);
+
+const audioOversample = 2;
+
+export class ColecoVision extends BaseZ80VDPBasedMachine {
+
+  defaultROMSize = 0x8000;
+  ram = new Uint8Array(0x400);
+  bios: Uint8Array;
+  keypadMode: boolean;
+
+  constructor() {
+    super();
+    this.init(this, this.newIOBus(), COLECOVISION_KEYCODE_MAP, new SN76489_Audio(new MasterAudio()));
+    this.bios = new lzgmini().decode(stringToByteArray(atob(COLECO_BIOS_LZG)));
+  }
+  
+  read = newAddressDecoder([
+    [0x0000, 0x1fff, 0x1fff, (a) => { return this.bios ? this.bios[a] : 0; }],
+    [0x6000, 0x7fff, 0x03ff, (a) => { return this.ram[a]; }],
+    [0x8000, 0xffff, 0x7fff, (a) => { return this.rom ? this.rom[a] : 0; }],
+  ]);
+
+  write = newAddressDecoder([
+    [0x6000, 0x7fff, 0x03ff, (a, v) => { this.ram[a] = v; }],
+  ]);
+
+  newIOBus() {
+    return {
+      read: (addr:number):number => {
+        addr &= 0xff;
+        //console.log('IO read', hex(addr,4));
+        switch (addr) {
+          case 0xfc: return this.inputs[this.keypadMode ? 1 : 0] ^ 0xff;
+          case 0xff: return this.inputs[this.keypadMode ? 3 : 2] ^ 0xff;
+        }
+        if (addr >= 0xa0 && addr <= 0xbf) {
+          if (addr & 1)
+            return this.vdp.readStatus();
+          else
+            return this.vdp.readData();
+        }
+        return 0;
+      },
+      write: (addr:number, val:number) => {
+        addr &= 0xff;
+        val &= 0xff;
+        //console.log('IO write', hex(addr,4), hex(val,2));
+        switch (addr >> 4) {
+          case 0x8: case 0x9: this.keypadMode = true; break;
+          case 0xc: case 0xd: this.keypadMode = false; break;
+          case 0xa: case 0xb:
+            if (addr & 1)
+              return this.vdp.writeAddress(val);
+            else
+              return this.vdp.writeData(val);
+          case 0xf: this.psg.setData(val); break;
+        }
+      }
+    };
+  }
+
+  loadState(state) {
+    super.loadState(state);
+    this.keypadMode = state['kpm'];
+  }
+  saveState() {
+    var state = super.saveState();
+    state['kpm'] = this.keypadMode;
+    return state;
+  }
+  reset() {
+    super.reset();
+    this.keypadMode = false;
+  }
+}
+
+var COLECO_BIOS_LZG = `
+TFpHAAAgAAAAB7djQcnHAQEDBgcx/3MYawAAAMMMgAehB+EPB+USB+UVB+UYB+UbB+UeB+QHHAZm
+IYA8igUCBYIAKgCAff5VIAl8/qogBCoKgOnHAwkfgICAAAMFT6CgB4LgByEH4WDAYMBABlggQIAg
+B+HAwOCgYAMGKweBQAYxBphAQEAG+KBABnAGEuAGUAabB+QA4AflBkggIAYyB+FgoKCgwAZdwAY5
+B+HABhAGYAfhIAZQoKDgIAMCcOCAwAaIYIDgoAZY4AMFOAYGBsgGIAZYAwJWBlAAQAMEcAYfQAZ4
+BhoDA3gGBgaQBjgGGwYfoOCAAwLIB+EDA/DAoAchAwNggAaQwAMFmOCAByEH5QZ4AwKABligAwUw
+4EBAQAZYICAgoAMCUAYuBpAGPwawoOAG4AfhAyNQQKCgBqDAoMADJECgoOADBGjgwAZYYIADBPgD
+AlADBEigAwVooAMFCAMEQAYHAwRQBg8GUAMiEAMEoAMEcAMD6gaQICAGyAADJZgDJ4gDI7gAwGAD
+I0CAwAME6AMC+QMCaCBgAwRwAGCgwAaIQOADA2AGJiAH4gZoAwPgA0M6ACAAAwX4gKDAAwPAAyLP
+AwNgAwXwAyNJAwR+AwX4oMADRQBgAyOgAyJxB+PAYANDEOBAQAMDeAMF+AfhA0RQAyJBB+NAAwPI
+BncGkOBgwAZQYECABrADQs8DAkjAQCBAA0QYAAMDUAcLOERsRFREOAA4fFR8RHw4AAAofHx8OBAA
+ABA4B+MQODgQfHwDBQgQBhgAADAwB4H8/PzMzAeBAAB4SEh4BkiEtLSEBggcDDRISDAAOEREOBAG
+eBgUEDBwYAAMNCw0LGxgAABUOGw4VAAAIDA4PDgwIAAIGDh4OBgIAwJXEAMCaCgHAgAoADxUVDQU
+FBQAOEQwKBhEAwNwAAB4eAMGIAchfBAHAQAHggMEqBh8GAfBABAwfDAH4gAAQEBAfAAAKCh8KCgG
+DxA4OHwGB3x8ODgGLwcHBg8GfgBsbEgGyQZnfCgAIDhAMAhwEABkZAgQIExMACBQUCBUSDQAMDAD
+ZEsQIAcCEAAgAwJ5EAYMKDh8OCgGURB8AwdYBuV8AwdlAyIyBAgQAyKmOERMVGREOAAQMAZ4OAYI
+BBggQHwH4jgEBhAIGChIfAgIAHxAQHgGSAYVeEQH4XwGeCAgAyNYBkgHgTwECAMiijAwAySSB+Mg
+Bh5AIBAIAwR3B0EGBAZyAwNgAwLoOERcVFxABrhEfEREAHhERAdCBghAQEBEOAZIBwF4AwN4AyJA
+B+RABlhcREQ8AAbvRAA4AwP4OAAEBwEDAohESFBgUEhEAyJ1AyN4RGxUBh9EAERkVEwGqAZGAwRY
+AwVIREQDIlAGSEgGmEADA/gDI9YQEAMCYAaoB8MoBkhUBwEoB+EoECgGKAaOBiB4AwLpQHgAOAMj
+kDgAAAMC9gQAADgIBwI4AAYlA0rv/DADRR0GGgQ8RDwABjQDA+gGCEQDAvgEBg4DAuAGSHhAAyJ4
+IHgDInAAAAYQPAQ4QEBwSAcBAANEehgACAAYCAgISDBAQAMD+QaOBlAAAGhUVEQDAnQG6AMCSAMC
+yAADI1p4QAMDSEQ8BAAAWCQgIHAGWEA4BAYYAwJnKAMCnAYuWANCUQME+AfiVHwGSEhIMAMDSAYY
+OBBgAAB4CDBAeAMCoGAgIBgDAngHYzAICAwICDAAKFADRuhsRER8AwPeQEQ4EDBIAwVYDAMF4Ach
+AyMIKAflMAflOCgH5AMkFxAwBiAGqAYgB+MGIAMFCAME8BAGgRgAIAMFCAYHKER8RAMCQGwH4gwA
+fEB4A2KYAHgUfFA8ADxQUHxQUFwAOAAwSAOCOCgH5WAH5TgDBaBgB+UoAwXwAwL9BugH5AAQOEBA
+OBAAGCQgeCAkXABEKBB8ByEAYFBQaFxISAAIFBA4EBBQIBgDBdADIyIQGAfhAwRgGAMGWFADI6kH
+4khoWEgDBSY8AwUeeAMi8DADQiAAA2ISA6N2/AQEB6FASFA4RAgcB+IsVBwEBmADglsGEiRIJAZf
+AEgkAyKuVACoB2SoBySo/FT8B2IDRDAHA/AHpQfjUFBQ0AdhAyK+8AfjAwYQ0BAGkAcGBhAGyNAQ
+8AYkAAYCB+MGJgfjBngDBVgcBpAQEPwDZgwDBhAHggZIAwYYAwUOBpBQUFBcAwNYXAMjtQMC9wbI
+3AboB6HcAwUYBpAGCAaQBhgGkBADBghQUAMGKAMDWAZCAwW7AwNQAwJoBpgDBXAGAnwG11ADB0AD
+JiADBbgGoPwHBQZJB+LgBwUcBwUDBhQAADRISDQDY49wSEhwQHhIA4OpAAB8A8R6eEggECADwtEA
+PANDTwNjYHAGWShQAwKHOBA4A8LZA0IIeAaZOEREKChsADBAIBA4BqkoA4KfA0KIVFQDIvg4QANi
+FwAGaQNjr3gHIwZYEAAGEEAwCDBABgkHoTAIBlEIFANIAlAgBiAAfAdhAwJ3B0IGfwMDjgPmiAcB
+A8SRHAYnBihQAwK9BwFgEAODTQPjNXgDAmgHHwcfBx8HHwcfBx8HHwcfBx8HHwcfBx8HHwcfBx8H
+HwcfBx8HHwcfBx8HHwcfBx8HHwcfBx8HHwcfBx8HHwcfBx8HHwcfBx8HHwcfBx8HHwcfBwM=`;
+
diff --git a/src/machine/vdp_z80.ts b/src/machine/vdp_z80.ts
new file mode 100644
index 00000000..31aa0076
--- /dev/null
+++ b/src/machine/vdp_z80.ts
@@ -0,0 +1,94 @@
+
+import { Z80, Z80State } from "../cpu/ZilogZ80";
+import { BasicScanlineMachine, Bus } from "../devices";
+import { newAddressDecoder, newKeyboardHandler } from "../emu";
+import { TssChannelAdapter } from "../audio";
+import { TMS9918A } from "../video/tms9918a";
+
+const audioOversample = 2;
+
+export abstract class BaseZ80VDPBasedMachine extends BasicScanlineMachine {
+
+  cpuFrequency = 3579545; // MHz
+  canvasWidth = 304;
+  numTotalScanlines = 262;
+  numVisibleScanlines = 240;
+  cpuCyclesPerLine = this.cpuFrequency / (262*60);
+  sampleRate = 262*60*audioOversample;
+  overscan = true;
+
+  cpu: Z80 = new Z80();
+  vdp: TMS9918A;
+  psg;
+  handler;
+  audioadapter;
+
+  init(membus:Bus, iobus:Bus, keycodemap, psg) {
+    this.connectCPUMemoryBus(membus);
+    this.connectCPUIOBus(iobus);
+    this.handler = newKeyboardHandler(this.inputs, keycodemap);
+    this.psg = psg;
+    this.audioadapter = psg && new TssChannelAdapter(psg.psg, audioOversample, this.sampleRate);
+  }
+  
+  setKeyInput(key:number, code:number, flags:number) : void {
+    this.handler(key,code,flags);
+  }
+  
+  connectVideo(pixels) {
+    super.connectVideo(pixels);
+    this.vdp = this.newVDP(this.pixels);
+  }
+
+  newVDP(frameData) {
+    var cru = {
+      setVDPInterrupt: (b) => {
+        if (b) {
+          this.cpu.NMI();
+        } else {
+          // TODO: reset interrupt?
+        }
+      }
+    };
+    return new TMS9918A(frameData, cru, true);
+  }
+
+  startScanline() {
+    this.audio && this.audioadapter && this.audioadapter.generate(this.audio);
+  }
+
+  drawScanline() {
+    this.vdp.drawScanline(this.scanline);
+  }
+
+  loadState(state) {
+    super.loadState(state);
+    this.vdp.restoreState(state['vdp']);
+  }
+  saveState() {
+    var state = super.saveState();
+    state['vdp'] = this.vdp.getState();
+    return state;
+  }
+  reset() {
+    super.reset();
+    this.vdp.reset();
+    this.psg.reset();
+  }
+
+  getDebugCategories() {
+    return ['VDP'];
+  }
+  getDebugInfo(category, state) {
+    switch (category) {
+      case 'VDP': return this.vdpStateToLongString(state.vdp);
+    }
+  }
+  vdpStateToLongString(ppu) {
+    return this.vdp.getRegsString();
+  }
+  readVRAMAddress(a : number) : number {
+    return this.vdp.ram[a & 0x3fff];
+  }
+}
+
diff --git a/src/platform/coleco.ts b/src/platform/coleco.ts
index 59fd5343..37d78076 100644
--- a/src/platform/coleco.ts
+++ b/src/platform/coleco.ts
@@ -1,28 +1,7 @@
-"use strict";
 
-import { Platform, BaseMAMEPlatform, BasicZ80ScanlinePlatform, getToolForFilename_z80 } from "../baseplatform";
-import { PLATFORMS, newAddressDecoder, padBytes, noise, setKeyboardFromMap, AnimationTimer, RasterVideo, Keys, makeKeycodeMap } from "../emu";
-import { hex, lzgmini, stringToByteArray } from "../util";
-import { MasterAudio, SN76489_Audio } from "../audio";
-import { TMS9918A } from "../video/tms9918a";
-
-// http://www.colecovision.eu/ColecoVision/development/tutorial1.shtml
-// http://www.colecovision.eu/ColecoVision/development/libcv.shtml
-// http://www.kernelcrash.com/blog/recreating-the-colecovision/2016/01/27/
-// http://www.atarihq.com/danb/files/CV-Tech.txt
-// http://www.atarihq.com/danb/files/CV-Sound.txt
-// http://www.colecoboxart.com/faq/FAQ05.htm
-// http://www.theadamresource.com/manuals/technical/Jeffcoleco.html
-// http://bifi.msxnet.org/msxnet//tech/tms9918a.txt
-// http://www.colecovision.dk/tools.htm?refreshed
-// http://www.theadamresource.com/manuals/technical/ColecoVision%20Coding%20Guide.pdf
-// http://www.unige.ch/medecine/nouspikel/ti99/tms9918a.htm
-// http://map.grauw.nl/articles/vdp_tut.php
-// http://www.msxcomputermagazine.nl/mccw/91/msx1demos1/en.html
-// http://www.segordon.com/colecovision.php
-// http://samdal.com/svvideo.htm
-// https://github.com/tursilion/convert9918
-// http://www.harmlesslion.com/cgi-bin/showprog.cgi?ColecoVision
+import { ColecoVision } from "../machine/coleco";
+import { Platform, BaseZ80MachinePlatform, BaseMAMEPlatform, getToolForFilename_z80 } from "../baseplatform";
+import { PLATFORMS } from "../emu";
 
 export var ColecoVision_PRESETS = [
   { id: 'text.c', name: 'Text Mode' },
@@ -41,194 +20,15 @@ export var ColecoVision_PRESETS = [
   { id: 'climber.c', name: 'Platform Game' },
 ];
 
-var COLECOVISION_KEYCODE_MAP = makeKeycodeMap([
-  [Keys.UP, 0, 0x1],
-  [Keys.DOWN, 0, 0x4],
-  [Keys.LEFT, 0, 0x8],
-  [Keys.RIGHT, 0, 0x2],
-  [Keys.A, 0, 0x40],
-  [Keys.B, 1, 0x40],
+class ColecoVisionPlatform extends BaseZ80MachinePlatform<ColecoVision> implements Platform {
 
-  [Keys.P2_UP, 2, 0x1],
-  [Keys.P2_DOWN, 2, 0x4],
-  [Keys.P2_LEFT, 2, 0x8],
-  [Keys.P2_RIGHT, 2, 0x2],
-  [Keys.P2_A, 2, 0x40],
-  [Keys.P2_B, 3, 0x40],
-]);
+  newMachine()          { return new ColecoVision(); }
+  getPresets()          { return ColecoVision_PRESETS; }
+  getDefaultExtension() { return ".c"; };
+  readAddress(a)        { return this.machine.read(a); }
+  // TODO loadBios(bios)	{ this.machine.loadBIOS(a); }
 
-class ColecoVisionPlatform extends BasicZ80ScanlinePlatform implements Platform {
-
-  cpuFrequency = 3579545; // MHz
-  canvasWidth = 304;
-  numTotalScanlines = 262;
-  numVisibleScanlines = 240;
-  defaultROMSize = 0x8000;
-
-  vdp: TMS9918A;
-  bios: Uint8Array;
-  keypadMode: boolean;
-  audio;
-  psg;
-
-  getPresets() { return ColecoVision_PRESETS; }
-
-  getKeyboardMap() { return COLECOVISION_KEYCODE_MAP; }
-
-  getVideoOptions() { return { overscan: true }; }
-
-  newRAM() {
-    return new Uint8Array(0x400);
-  }
-
-  newMembus() {
-    return {
-      read: newAddressDecoder([
-        [0x0000, 0x1fff, 0x1fff, (a) => { return this.bios ? this.bios[a] : 0; }],
-        [0x6000, 0x7fff, 0x3ff, (a) => { return this.ram[a]; }],
-        [0x8000, 0xffff, 0x7fff, (a) => { return this.rom ? this.rom[a] : 0; }],
-      ]),
-      write: newAddressDecoder([
-        [0x6000, 0x7fff, 0x3ff, (a, v) => { this.ram[a] = v; }],
-      ]),
-    };
-  }
-
-  newIOBus() {
-    return {
-      read: (addr:number):number => {
-        addr &= 0xff;
-        //console.log('IO read', hex(addr,4));
-        switch (addr) {
-          case 0xfc: return this.inputs[this.keypadMode ? 1 : 0] ^ 0xff;
-          case 0xff: return this.inputs[this.keypadMode ? 3 : 2] ^ 0xff;
-        }
-        if (addr >= 0xa0 && addr <= 0xbf) {
-          if (addr & 1)
-            return this.vdp.readStatus();
-          else
-            return this.vdp.readData();
-        }
-        return 0;
-      },
-      write: (addr:number, val:number) => {
-        addr &= 0xff;
-        val &= 0xff;
-        //console.log('IO write', hex(addr,4), hex(val,2));
-        switch (addr >> 4) {
-          case 0x8: case 0x9: this.keypadMode = true; break;
-          case 0xc: case 0xd: this.keypadMode = false; break;
-          case 0xa: case 0xb:
-            if (addr & 1)
-              return this.vdp.writeAddress(val);
-            else
-              return this.vdp.writeData(val);
-          case 0xf: this.psg.setData(val); break;
-        }
-      }
-    };
-  }
-
-  start() {
-    super.start();
-    this.bios = new lzgmini().decode(stringToByteArray(atob(COLECO_BIOS_LZG)));
-    this.audio = new MasterAudio();
-    this.psg = new SN76489_Audio(this.audio);
-    var cru = {
-      setVDPInterrupt: (b) => {
-        if (b) {
-          this.cpu.nonMaskableInterrupt();
-        } else {
-          // TODO: reset interrupt?
-        }
-      }
-    };
-    this.vdp = this.newVDP(this.video.getFrameData(), cru, true); // true = 4 sprites/line
-  }
-
-  newVDP(frameData, cru, flicker) {
-    return new TMS9918A(frameData, cru, flicker);
-  }
-
-  startScanline(sl: number) {
-  }
-
-  drawScanline(sl: number) {
-    this.vdp.drawScanline(sl);
-  }
-
-  loadState(state) {
-    super.loadState(state);
-    this.vdp.restoreState(state['vdp']);
-    this.keypadMode = state['kpm'];
-  }
-  saveState() {
-    var state = super.saveState();
-    state['vdp'] = this.vdp.getState();
-    state['kpm'] = this.keypadMode;
-    return state;
-  }
-  reset() {
-    super.reset();
-    this.vdp.reset();
-    this.psg.reset();
-    this.keypadMode = false;
-  }
-
-  getDebugCategories() {
-    return super.getDebugCategories().concat(['VDP']);
-  }
-  getDebugInfo(category, state) {
-    switch (category) {
-      case 'VDP': return this.vdpStateToLongString(state.vdp);
-      default: return super.getDebugInfo(category, state);
-    }
-  }
-  vdpStateToLongString(ppu) {
-    return this.vdp.getRegsString();
-  }
-  readVRAMAddress(a : number) : number {
-    return this.vdp.ram[a & 0x3fff];
-  }
 }
-
-var COLECO_BIOS_LZG = `
-TFpHAAAgAAAAB7djQcnHAQEDBgcx/3MYawAAAMMMgAehB+EPB+USB+UVB+UYB+UbB+UeB+QHHAZm
-IYA8igUCBYIAKgCAff5VIAl8/qogBCoKgOnHAwkfgICAAAMFT6CgB4LgByEH4WDAYMBABlggQIAg
-B+HAwOCgYAMGKweBQAYxBphAQEAG+KBABnAGEuAGUAabB+QA4AflBkggIAYyB+FgoKCgwAZdwAY5
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-
 /// MAME support
 
 class ColecoVisionMAMEPlatform extends BaseMAMEPlatform implements Platform {