diff --git a/src/net/torvald/tsvm/AppLoader.java b/src/net/torvald/tsvm/AppLoader.java
index a3e54ed..c2e2dd1 100644
--- a/src/net/torvald/tsvm/AppLoader.java
+++ b/src/net/torvald/tsvm/AppLoader.java
@@ -30,10 +30,15 @@ public class AppLoader {
         // val vm = VM(64.kB(), TheRealWorld(), arrayOf(GenericBios))
         //VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{BasicBios.INSTANCE, BasicRom.INSTANCE});
         //VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{OEMBios.INSTANCE, BasicRom.INSTANCE});
-
         VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{QuickBios.INSTANCE});
         //VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{TBASRelBios.INSTANCE});
-        new LwjglApplication(new VMGUI(vm, appConfig), appConfig);
+
+        EmulInstance reference = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.ReferenceGraphicsAdapter", "assets/disk0");
+        EmulInstance reference2 = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.ReferenceLikeLCD", "assets/disk0");
+        EmulInstance term = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.TexticsAdapter", "assets/disk0");
+        EmulInstance portable = new EmulInstance(appConfig, vm, "net.torvald.tsvm.peripheral.CharacterLCDdisplay", "assets/disk0");
+
+        new LwjglApplication(new VMGUI(portable), appConfig);
     }
 
     public static ShaderProgram loadShaderFromFile(String vert, String frag) {
diff --git a/src/net/torvald/tsvm/VMGUI.kt b/src/net/torvald/tsvm/VMGUI.kt
index c27202c..5f399b0 100644
--- a/src/net/torvald/tsvm/VMGUI.kt
+++ b/src/net/torvald/tsvm/VMGUI.kt
@@ -12,7 +12,18 @@ import java.io.File
 
 fun ByteArray.startsWith(other: ByteArray) = this.sliceArray(other.indices).contentEquals(other)
 
-class VMGUI(val vm: VM, val appConfig: LwjglApplicationConfiguration) : ApplicationAdapter() {
+
+data class EmulInstance(
+    val appConfig: LwjglApplicationConfiguration,
+    val vm: VM,
+    val display: String,
+    val diskPath: String = "assets/disk0"
+)
+
+class VMGUI(val loaderInfo: EmulInstance) : ApplicationAdapter() {
+
+    val appConfig = loaderInfo.appConfig
+    val vm = loaderInfo.vm
 
     lateinit var batch: SpriteBatch
     lateinit var camera: OrthographicCamera
@@ -41,13 +52,14 @@ class VMGUI(val vm: VM, val appConfig: LwjglApplicationConfiguration) : Applicat
         camera.setToOrtho(false)
         camera.update()
         batch.projectionMatrix = camera.combined
-        //Gdx.gl20.glViewport(0, 0, appConfig.width, appConfig.height)
 
 
-        //gpu = GraphicsAdapter(vm, GraphicsAdapter.DEFAULT_CONFIG_COLOR_CRT)
-        //gpu = GraphicsAdapter(vm, GraphicsAdapter.DEFAULT_CONFIG_PMLCD)
-        //gpu = TexticsAdapter(vm)
-        gpu = CharacterLCDdisplay(vm)
+        val loadedClass = Class.forName(loaderInfo.display)
+        val loadedClassConstructor = loadedClass.getConstructor(vm::class.java)
+        val loadedClassInstance = loadedClassConstructor.newInstance(vm)
+        gpu = (loadedClassInstance as GraphicsAdapter)
+
+        vm.getIO().blockTransferPorts[0].attachDevice(TestDiskDrive(vm, 0, File(loaderInfo.diskPath)))
 
         vm.peripheralTable[1] = PeripheralEntry(
             VM.PERITYPE_GPU_AND_TERM,
diff --git a/src/net/torvald/tsvm/peripheral/GraphicsAdapter.kt b/src/net/torvald/tsvm/peripheral/GraphicsAdapter.kt
index da6dafd..a1504f9 100644
--- a/src/net/torvald/tsvm/peripheral/GraphicsAdapter.kt
+++ b/src/net/torvald/tsvm/peripheral/GraphicsAdapter.kt
@@ -36,6 +36,9 @@ data class SuperGraphicsAddonConfig(
     val hasSecondBank: Boolean = false
 )
 
+class ReferenceGraphicsAdapter(vm: VM) : GraphicsAdapter(vm, GraphicsAdapter.DEFAULT_CONFIG_COLOR_CRT)
+class ReferenceLikeLCD(vm: VM) : GraphicsAdapter(vm, GraphicsAdapter.DEFAULT_CONFIG_PMLCD)
+
 /**
  * NOTE: if TTY size is greater than 80*32, SEGFAULT will occur because text buffer is fixed in size
  */
diff --git a/src/net/torvald/tsvm/peripheral/IOSpace.kt b/src/net/torvald/tsvm/peripheral/IOSpace.kt
index 45a5ebc..97742c9 100644
--- a/src/net/torvald/tsvm/peripheral/IOSpace.kt
+++ b/src/net/torvald/tsvm/peripheral/IOSpace.kt
@@ -41,7 +41,9 @@ class IOSpace(val vm: VM) : PeriBase, InputProcessor {
     init {
         //blockTransferPorts[1].attachDevice(TestFunctionGenerator())
         //blockTransferPorts[0].attachDevice(TestDiskDrive(vm, 0, File("assets")))
-        blockTransferPorts[0].attachDevice(TestDiskDrive(vm, 0, File("assets/disk0")))
+        //blockTransferPorts[0].attachDevice(TestDiskDrive(vm, 0, File("assets/disk0")))
+
+        // for testers: use EmulInstance
     }
 
     private fun composeBlockTransferStatus(portno: Int): Int {