diff --git a/src/baseplatform.ts b/src/baseplatform.ts
index 01da2b2b..7256d08b 100644
--- a/src/baseplatform.ts
+++ b/src/baseplatform.ts
@@ -1001,6 +1001,11 @@ export abstract class BaseMachinePlatform<T extends Machine> extends BaseDebugPl
       this.video = new RasterVideo(this.mainElement, vp.width, vp.height, {overscan:!!vp.overscan,rotate:vp.rotate|0});
       this.video.create();
       m.connectVideo(this.video.getFrameData());
+      // TODO: support keyboard w/o video?
+      if (hasKeyInput(m)) {
+        this.video.setKeyboardEvents(m.setKeyInput.bind(m));
+        this.poller = new ControllerPoller(m.setKeyInput.bind(m));
+      }
     }
     if (hasAudio(m)) {
       var ap = m.getAudioParams();
@@ -1008,10 +1013,6 @@ export abstract class BaseMachinePlatform<T extends Machine> extends BaseDebugPl
       this.audio.start();
       m.connectAudio(this.audio);
     }
-    if (hasKeyInput(m)) {
-      this.video.setKeyboardEvents(m.setKeyInput.bind(m));
-      this.poller = new ControllerPoller(m.setKeyInput.bind(m));
-    }
     if (hasPaddleInput(m)) {
       this.video.setupMouseEvents();
     }
@@ -1042,7 +1043,7 @@ export abstract class BaseMachinePlatform<T extends Machine> extends BaseDebugPl
 
   advance(novideo:boolean) {
     this.machine.advanceFrame(999999, this.getDebugCallback());
-    if (!novideo) this.video.updateFrame();
+    if (!novideo && this.video) this.video.updateFrame();
   }
 
   isRunning() {
diff --git a/src/devices.ts b/src/devices.ts
index 48c64fb0..e70fd038 100644
--- a/src/devices.ts
+++ b/src/devices.ts
@@ -231,29 +231,19 @@ export interface BasicMachineState extends BasicMachineControlsState {
   ram: Uint8Array;
 }
 
-export abstract class BasicMachine implements HasCPU, Bus, SampledAudioSource, AcceptsROM, Probeable,
+export abstract class BasicHeadlessMachine implements HasCPU, Bus, AcceptsROM, Probeable,
   SavesState<BasicMachineState>, SavesInputState<BasicMachineControlsState> {
 
   abstract cpuFrequency : number;
-  abstract canvasWidth : number;
-  abstract numVisibleScanlines : number;
   abstract defaultROMSize : number;
-  abstract sampleRate : number;
-  overscan : boolean = false;
-  rotate : number = 0;
-  
+
   abstract cpu : CPU;
-  abstract ram : Uint8Array;
-  
+  abstract ram : Uint8Array;  
+
   rom : Uint8Array;
-  pixels : Uint32Array;
-  audio : SampledAudioSink;
   inputs : Uint8Array = new Uint8Array(32);
   handler : (key,code,flags) => void; // keyboard handler
 
-  scanline : number;
-  frameCycles : number;
-  
   nullProbe = new NullProbe();
   probe : ProbeAll = this.nullProbe;
   
@@ -263,18 +253,6 @@ export abstract class BasicMachine implements HasCPU, Bus, SampledAudioSource, A
   setKeyInput(key:number, code:number, flags:number) : void {
     this.handler && this.handler(key,code,flags);
   }
-  getAudioParams() : SampledAudioParams {
-    return {sampleRate:this.sampleRate, stereo:false};
-  }
-  connectAudio(audio : SampledAudioSink) : void {
-    this.audio = audio;
-  }
-  getVideoParams() : VideoParams {
-    return {width:this.canvasWidth, height:this.numVisibleScanlines, overscan:this.overscan, rotate:this.rotate};
-  }
-  connectVideo(pixels:Uint32Array) : void {
-    this.pixels = pixels;
-  }
   connectProbe(probe: ProbeAll) : void {
     this.probe = probe || this.nullProbe;
   }
@@ -348,6 +326,33 @@ export abstract class BasicMachine implements HasCPU, Bus, SampledAudioSource, A
   }
 }
 
+export abstract class BasicMachine extends BasicHeadlessMachine implements SampledAudioSource {
+
+  abstract canvasWidth : number;
+  abstract numVisibleScanlines : number;
+  abstract sampleRate : number;
+  overscan : boolean = false;
+  rotate : number = 0;
+  
+  pixels : Uint32Array;
+  audio : SampledAudioSink;
+
+  scanline : number;
+  
+  getAudioParams() : SampledAudioParams {
+    return {sampleRate:this.sampleRate, stereo:false};
+  }
+  connectAudio(audio : SampledAudioSink) : void {
+    this.audio = audio;
+  }
+  getVideoParams() : VideoParams {
+    return {width:this.canvasWidth, height:this.numVisibleScanlines, overscan:this.overscan, rotate:this.rotate};
+  }
+  connectVideo(pixels:Uint32Array) : void {
+    this.pixels = pixels;
+  }
+}
+
 export abstract class BasicScanlineMachine extends BasicMachine implements RasterFrameBased {
 
   abstract numTotalScanlines : number;
@@ -355,6 +360,8 @@ export abstract class BasicScanlineMachine extends BasicMachine implements Raste
 
   abstract startScanline() : void;
   abstract drawScanline() : void;
+
+  frameCycles : number;
   
   advanceFrame(maxClocks:number, trap) : number {
     this.preFrame();
diff --git a/src/machine/kim1.ts b/src/machine/kim1.ts
new file mode 100644
index 00000000..168b9304
--- /dev/null
+++ b/src/machine/kim1.ts
@@ -0,0 +1,148 @@
+
+import { MOS6502, MOS6502State } from "../cpu/MOS6502";
+import { BasicHeadlessMachine } from "../devices";
+import { padBytes, Keys, KeyFlags, newAddressDecoder } from "../emu"; // TODO
+import { hex, stringToByteArray, lzgmini } from "../util";
+
+const KIM1_KEYMATRIX_NOSHIFT = [
+  Keys.VK_DELETE, Keys.VK_ENTER, Keys.VK_RIGHT, Keys.VK_F7,	Keys.VK_F1, Keys.VK_F3, Keys.VK_F5, Keys.VK_DOWN,
+  Keys.VK_3, Keys.VK_W, Keys.VK_A, Keys.VK_4,			Keys.VK_Z, Keys.VK_S, Keys.VK_E, Keys.VK_SHIFT,
+  Keys.VK_5, Keys.VK_R, Keys.VK_D, Keys.VK_6,			Keys.VK_C, Keys.VK_F, Keys.VK_T, Keys.VK_X,
+  Keys.VK_7, Keys.VK_Y, Keys.VK_G, Keys.VK_8,			Keys.VK_B, Keys.VK_H, Keys.VK_U, Keys.VK_V,
+  Keys.VK_9, Keys.VK_I, Keys.VK_J, Keys.VK_0,			Keys.VK_M, Keys.VK_K, Keys.VK_O, Keys.VK_N,
+  null/*Keys.VK_PLUS*/, Keys.VK_P, Keys.VK_L, Keys.VK_MINUS,	Keys.VK_PERIOD, null/*Keys.VK_COLON*/, null/*Keys.VK_AT*/, Keys.VK_COMMA,
+  null/*Keys.VK_POUND*/, null/*TIMES*/, Keys.VK_SEMICOLON, Keys.VK_HOME, Keys.VK_SHIFT/*right*/, Keys.VK_EQUALS, Keys.VK_TILDE, Keys.VK_SLASH,
+  Keys.VK_1, Keys.VK_LEFT, Keys.VK_CONTROL, Keys.VK_2,		Keys.VK_SPACE, Keys.VK_ALT, Keys.VK_Q, null/*STOP*/,
+];
+
+const KEYBOARD_ROW_0 = 0;
+
+class RRIOT_6530 {
+
+  regs = new Uint8Array(16);
+  ina : number = 0;
+  inb : number = 0;
+
+  read(a:number) : number {
+    //console.log('read', hex(a), hex(this.regs[a]));
+    return this.regs[a];
+  }
+
+  write(a:number,v:number) {
+    this.regs[a] = v;
+    //console.log('write', hex(a), hex(v));
+  }
+  
+  input_a() { return this.ina & ~this.regs[1]; }
+  input_b() { return this.inb & ~this.regs[1]; }
+  output_a() { return (this.regs[0] ^ 0xff) | this.regs[1]; }
+  output_b() { return (this.regs[2] ^ 0xff) | this.regs[3]; }
+}
+
+export class KIM1 extends BasicHeadlessMachine {
+  cpuFrequency = 1000000;
+  defaultROMSize = 0x1000;
+  
+  cpu = new MOS6502();
+  ram = new Uint8Array(0x1800);
+  bios : Uint8Array;
+
+  rriot1 : RRIOT_6530 = new RRIOT_6530();
+  rriot2 : RRIOT_6530 = new RRIOT_6530();
+  digits = [];
+
+  constructor() {
+    super();
+    this.bios = new lzgmini().decode(stringToByteArray(atob(KIM1_BIOS_LZG)));
+    this.connectCPUMemoryBus(this);
+  }
+
+  read = newAddressDecoder([
+    [0x1700, 0x173f, 0x000f, (a) => { return this.readIO_1(a); }],
+    [0x1740, 0x177f, 0x000f, (a) => { return this.readIO_2(a); }],
+    [0x0000, 0x17ff, 0x1fff, (a) => { return this.ram[a]; }],
+    [0x1800, 0x1fff, 0x07ff, (a) => { return this.bios[a]; }],
+  ], {gmask:0x1fff});
+  
+  write = newAddressDecoder([
+    [0x1700, 0x173f, 0x000f, (a,v) => { return this.writeIO_1(a,v); }],
+    [0x1740, 0x177f, 0x000f, (a,v) => { return this.writeIO_2(a,v); }],
+    [0x0000, 0x17ff, 0x1fff, (a,v) => { this.ram[a] = v; }],
+  ], {gmask:0x1fff});
+  
+  readConst(a:number) : number {
+    return this.read(a);
+  }
+
+  readIO_1(a:number) : number {
+    return this.rriot1.read(a);
+  }
+  
+  writeIO_1(a:number, v:number) {
+    this.rriot1.write(a,v);
+  }
+  
+  readIO_2(a:number) : number {
+    switch (a & 0xf) {
+      case 0x0:
+        let cols = 0;
+        for (let i=0; i<8; i++)
+          if ((this.rriot2.regs[0] & (1<<i)) == 0)
+            cols |= this.inputs[KEYBOARD_ROW_0 + i];
+        //if (cols) console.log(this.rriot1.regs[0], cols);
+        this.rriot2.ina = cols ^ 0xff;
+    }
+    return this.rriot2.read(a);
+  }
+  
+  writeIO_2(a:number, v:number) {
+    this.rriot2.write(a,v);
+    // update LED
+    let digit = this.rriot2.output_a();
+    let segments = this.rriot2.output_b();
+    console.log(digit, segments);
+  }
+  
+  loadROM(data) {
+    super.loadROM(data);
+    this.ram.set(this.rom, 0x400);
+    this.reset();
+  }
+
+  loadBIOS(data) {
+    this.bios = padBytes(data, 0x800);
+    this.reset();
+  }
+
+  setKeyInput(key:number, code:number, flags:number) : void {
+    //console.log(key,code,flags);
+    var keymap = KIM1_KEYMATRIX_NOSHIFT;
+    for (var i=0; i<keymap.length; i++) {
+      if (keymap[i] && keymap[i].c == key) {
+        let row = i >> 3;
+        let col = i & 7;
+        // is column selected?
+        if (flags & KeyFlags.KeyDown) {
+          this.inputs[KEYBOARD_ROW_0 + row] |= (1<<col);
+        } else if (flags & KeyFlags.KeyUp) {
+          this.inputs[KEYBOARD_ROW_0 + row] &= ~(1<<col);
+        }
+        console.log(key, row, col, hex(this.inputs[KEYBOARD_ROW_0 + row]));
+        break;
+      }
+    }
+  }
+  
+  advanceFrame(maxClocks:number, trap) : number {
+    var clock = 0;
+    while (clock < maxClocks) {
+      if (trap && trap()) break;
+      clock += this.advanceCPU();
+    }
+    return clock;
+  }
+}
+
+// https://github.com/jefftranter/6502/blob/master/asm/KIM-1/ROMs/kim.s
+const KIM1_BIOS_LZG = `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`;
+
diff --git a/src/platform/apple2.ts b/src/platform/apple2.ts
index 4e106c12..e28c3537 100644
--- a/src/platform/apple2.ts
+++ b/src/platform/apple2.ts
@@ -1,8 +1,6 @@
 
-import { Platform, Base6502Platform, BaseMAMEPlatform, getOpcodeMetadata_6502, getToolForFilename_6502 } from "../baseplatform";
-import { PLATFORMS, RAM, newAddressDecoder, padBytes, noise, setKeyboardFromMap, AnimationTimer, RasterVideo, Keys, KeyFlags, makeKeycodeMap, dumpRAM } from "../emu";
-import { hex, lzgmini } from "../util";
-import { SampleAudio, SampledAudio } from "../audio";
+import { Platform, BaseMAMEPlatform, getOpcodeMetadata_6502, getToolForFilename_6502 } from "../baseplatform";
+import { PLATFORMS } from "../emu";
 
 const APPLE2_PRESETS = [
   {id:'sieve.c', name:'Sieve'},
diff --git a/src/platform/kim1.ts b/src/platform/kim1.ts
index 88e96c71..d7322e78 100644
--- a/src/platform/kim1.ts
+++ b/src/platform/kim1.ts
@@ -1,239 +1,20 @@
 
-import { Platform, Base6502Platform, BaseMAMEPlatform, getOpcodeMetadata_6502, getToolForFilename_6502 } from "../baseplatform";
-import { PLATFORMS, RAM, newAddressDecoder, padBytes, noise, setKeyboardFromMap, AnimationTimer, RasterVideo, Keys, makeKeycodeMap, dumpRAM, getMousePos, EmuHalt, KeyFlags, _setKeyboardEvents } from "../emu";
-import { hex, lzgmini, stringToByteArray, lpad, rpad, rgb2bgr } from "../util";
-
-declare var jt; // for 6502
-
-// http://www.6502.org/trainers/buildkim/kim.htm
-// http://users.telenet.be/kim1-6502/
-// http://retro.hansotten.nl/uploads/6502docs/usrman.htm#F312
-// http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/6530.pdf
-// http://archive.6502.org/datasheets/mos_6530_rriot_preliminary_aug_1975.pdf
-// https://github.com/mamedev/mame/blob/master/src/mame/drivers/kim1.cpp
-// https://github.com/mamedev/mame/blob/c5426f2fabc220be2efc2790ffca57bde108cbf2/src/devices/machine/mos6530.cpp
+import { Platform, getOpcodeMetadata_6502, getToolForFilename_6502 } from "../baseplatform";
+import { PLATFORMS } from "../emu";
+import { KIM1 } from "../machine/kim1";
+import { Base6502MachinePlatform } from "../baseplatform";
 
 var KIM1_PRESETS = [
   {id:'hello.dasm', name:'Hello World (ASM)'},
 ];
 
-const KIM1_KEYCODE_MAP = makeKeycodeMap([
-]);
+class KIM1Platform extends Base6502MachinePlatform<KIM1> implements Platform {
 
-const KIM1_KEYMATRIX_NOSHIFT = [
-  Keys.VK_DELETE, Keys.VK_ENTER, Keys.VK_RIGHT, Keys.VK_F7,	Keys.VK_F1, Keys.VK_F3, Keys.VK_F5, Keys.VK_DOWN,
-  Keys.VK_3, Keys.VK_W, Keys.VK_A, Keys.VK_4,			Keys.VK_Z, Keys.VK_S, Keys.VK_E, Keys.VK_SHIFT,
-  Keys.VK_5, Keys.VK_R, Keys.VK_D, Keys.VK_6,			Keys.VK_C, Keys.VK_F, Keys.VK_T, Keys.VK_X,
-  Keys.VK_7, Keys.VK_Y, Keys.VK_G, Keys.VK_8,			Keys.VK_B, Keys.VK_H, Keys.VK_U, Keys.VK_V,
-  Keys.VK_9, Keys.VK_I, Keys.VK_J, Keys.VK_0,			Keys.VK_M, Keys.VK_K, Keys.VK_O, Keys.VK_N,
-  null/*Keys.VK_PLUS*/, Keys.VK_P, Keys.VK_L, Keys.VK_MINUS,	Keys.VK_PERIOD, null/*Keys.VK_COLON*/, null/*Keys.VK_AT*/, Keys.VK_COMMA,
-  null/*Keys.VK_POUND*/, null/*TIMES*/, Keys.VK_SEMICOLON, Keys.VK_HOME, Keys.VK_SHIFT/*right*/, Keys.VK_EQUALS, Keys.VK_TILDE, Keys.VK_SLASH,
-  Keys.VK_1, Keys.VK_LEFT, Keys.VK_CONTROL, Keys.VK_2,		Keys.VK_SPACE, Keys.VK_ALT, Keys.VK_Q, null/*STOP*/,
-];
+  newMachine()          { return new KIM1(); }
+  getPresets()          { return KIM1_PRESETS; }
+  getDefaultExtension() { return ".dasm"; };
+  readAddress(a)        { return this.machine.readConst(a); }
 
-const KEYBOARD_ROW_0 = 0;
-
-const cpuFrequency = 1000000;
-const romLength = 0x1000;
-
-class RRIOT_6530 {
-
-  regs = new Uint8Array(16);
-  ina : number = 0;
-  inb : number = 0;
-
-  read(a:number) : number {
-    //console.log('read', hex(a), hex(this.regs[a]));
-    return this.regs[a];
-  }
-
-  write(a:number,v:number) {
-    this.regs[a] = v;
-    //console.log('write', hex(a), hex(v));
-  }
-  
-  input_a() { return this.ina & ~this.regs[1]; }
-  input_b() { return this.inb & ~this.regs[1]; }
-  output_a() { return (this.regs[0] ^ 0xff) | this.regs[1]; }
-  output_b() { return (this.regs[2] ^ 0xff) | this.regs[3]; }
-}
-
-class KIM1Platform extends Base6502Platform implements Platform {
-
-  mainElement : HTMLElement;
-  cpu;
-  ram  : Uint8Array;
-  bios : Uint8Array;
-  bus;
-  timer : AnimationTimer;
-  inputs = new Uint8Array(16);
-  rriot1 : RRIOT_6530 = new RRIOT_6530();
-  rriot2 : RRIOT_6530 = new RRIOT_6530();
-  digits = [];
-  
-  constructor(mainElement : HTMLElement) {
-    super();
-    this.mainElement = mainElement;
-  }
-
-  getPresets() {
-    return KIM1_PRESETS;
-  }
-  
-  getKeyboardMap() { return null; /* TODO: KIM1_KEYCODE_MAP;*/ }
-
-  getKeyboardFunction() {
-    return (key,code,flags) => {
-      //console.log(key,code,flags);
-      var keymap = KIM1_KEYMATRIX_NOSHIFT;
-      for (var i=0; i<keymap.length; i++) {
-        if (keymap[i] && keymap[i].c == key) {
-          let row = i >> 3;
-          let col = i & 7;
-          // is column selected?
-          if (flags & KeyFlags.KeyDown) {
-            this.inputs[KEYBOARD_ROW_0 + row] |= (1<<col);
-          } else if (flags & KeyFlags.KeyUp) {
-            this.inputs[KEYBOARD_ROW_0 + row] &= ~(1<<col);
-          }
-          console.log(key, row, col, hex(this.inputs[KEYBOARD_ROW_0 + row]));
-          break;
-        }
-      }
-    }
-  }
-  
-  readIO_1(a:number) : number {
-    return this.rriot1.read(a);
-  }
-  
-  writeIO_1(a:number, v:number) {
-    this.rriot1.write(a,v);
-  }
-  
-  readIO_2(a:number) : number {
-    switch (a & 0xf) {
-      case 0x0:
-        let cols = 0;
-        for (let i=0; i<8; i++)
-          if ((this.rriot2.regs[0] & (1<<i)) == 0)
-            cols |= this.inputs[KEYBOARD_ROW_0 + i];
-        //if (cols) console.log(this.rriot1.regs[0], cols);
-        this.rriot2.ina = cols ^ 0xff;
-    }
-    return this.rriot2.read(a);
-  }
-  
-  writeIO_2(a:number, v:number) {
-    this.rriot2.write(a,v);
-    // update LED
-    let digit = this.rriot2.output_a();
-    let segments = this.rriot2.output_b();
-    console.log(digit, segments);
-  }
-  
-  start() {
-    this.cpu = new jt.M6502();
-    this.ram = new Uint8Array(0x1800);
-    this.bios = new lzgmini().decode(stringToByteArray(atob(KIM1_BIOS_LZG)));
-    this.bus = {
-      read: newAddressDecoder([
-        [0x1700, 0x173f, 0x000f, (a) => { return this.readIO_1(a); }],
-        [0x1740, 0x177f, 0x000f, (a) => { return this.readIO_2(a); }],
-        [0x0000, 0x17ff, 0x1fff, (a) => { return this.ram[a]; }],
-        [0x1800, 0x1fff, 0x07ff, (a) => { return this.bios[a]; }],
-      ], {gmask:0x1fff}),
-      write: newAddressDecoder([
-        [0x1700, 0x173f, 0x000f, (a,v) => { return this.writeIO_1(a,v); }],
-        [0x1740, 0x177f, 0x000f, (a,v) => { return this.writeIO_2(a,v); }],
-        [0x0000, 0x17ff, 0x1fff, (a,v) => { this.ram[a] = v; }],
-      ], {gmask:0x1fff}),
-    };
-    this.cpu.connectBus(this.bus);
-    this.timer = new AnimationTimer(60, this.nextFrame.bind(this));
-    // create digits display
-    let div = $('<div class="emuvideo"/>').appendTo(this.mainElement);
-    div[0].tabIndex = -1;               // Make it focusable
-    for (let i=0; i<6; i++) {
-      let id = "kim_digit_" + i;
-      let el = $('<span style="font-size:3em;font-family:monospace;color:red">0</span>').attr('id',id).appendTo(div);
-      this.digits.push(el);
-    }
-    _setKeyboardEvents(div[0], this.getKeyboardFunction());
-  }
-
-  advance(novideo : boolean) {
-    var debugCond = this.getDebugCallback();
-    for (var i=0; i<cpuFrequency/60; i++) {
-      if (debugCond && debugCond()) {
-        debugCond = null;
-        break;
-      }
-      this.cpu.clockPulse();
-    }
-  }
-
-  loadROM(title, data) {
-    let rom = padBytes(data, romLength);
-    this.ram.set(rom, 0x400);
-    this.reset();
-  }
-
-  loadBIOS(title, data) {
-    this.bios = padBytes(data, 0x800);
-    this.reset();
-  }
-
-  isRunning() {
-    return this.timer.isRunning();
-  }
-
-  pause() {
-    this.timer.stop();
-  }
-
-  resume() {
-    this.timer.start();
-  }
-
-  reset() {
-    this.cpu.reset();
-    this.cpu.clockPulse(); // TODO: needed for test to pass?
-  }
-
-  // TODO: don't log if profiler active
-  readAddress(addr : number) {
-    return this.bus.read(addr) | 0;
-  }
-
-  loadState(state) {
-    this.unfixPC(state.c);
-    this.cpu.loadState(state.c);
-    this.fixPC(state.c);
-    this.ram.set(state.b);
-    this.loadControlsState(state);
-  }
-  saveState() {
-    return {
-      c:this.getCPUState(),
-      b:this.ram.slice(0),
-      in:this.inputs.slice(0)
-    };
-  }
-
-  loadControlsState(state) {
-    this.inputs.set(state.in);
-  }
-
-  saveControlsState() {
-    return {
-      in:this.inputs.slice(0)
-    };
-  }
-
-  getCPUState() {
-    return this.fixPC(this.cpu.saveState());
-  }
   getMemoryMap = function() { return { main:[
       {name:'RAM',          start:0x0000,size:0x1400,type:'ram'},
       {name:'6530',         start:0x1700,size:0x0040,type:'io'},
diff --git a/src/ui.ts b/src/ui.ts
index a74760c6..9b63f61f 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -1976,7 +1976,8 @@ function loadAndStartPlatform() {
     } finally {
       revealTopBar();
     }
-  }).catch( () => {
+  }).catch( (e) => {
+    console.log(e);
     alertError('Platform "' + platform_id + '" not supported.');
   });
 }