diff --git a/README.md b/README.md
index 1270942..5f0f56d 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
 # useless-umd-player
 
+[grrr](assets/grrr.png)
+
+![AI Generated](https://raw.githubusercontent.com/dotnetdave/ai-usage-badges/refs/heads/main/badges/png/1x/ai-generated.png)
+
 a standalone player for PSP UMD Video ISO images: open a disc, render its real
 menu, and play the movie (H.264 video + ATRAC3+ audio) with mouse and
 keyboard/media-key controls.
diff --git a/assets/grrr.png b/assets/grrr.png
new file mode 100644
index 0000000..8e89fdb
Binary files /dev/null and b/assets/grrr.png differ
diff --git a/core/src/main/java/dev/quoije/umd/rco/Display.java b/core/src/main/java/dev/quoije/umd/rco/Display.java
new file mode 100644
index 0000000..a7998a4
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/Display.java
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco;
+
+/** The rendering surface backing an RCO menu. Implemented by the UI layer. */
+public interface Display {
+
+    void setFocus(IDisplay display);
+
+    void add(IDisplay display);
+
+    void remove(IDisplay display);
+
+    void repaint();
+
+    void changeResource();
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/IDisplay.java b/core/src/main/java/dev/quoije/umd/rco/IDisplay.java
new file mode 100644
index 0000000..c343ef2
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/IDisplay.java
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco;
+
+/** A renderable RCO object (plane, button, text, ...). */
+public interface IDisplay {
+
+    Object getImage();
+
+    Object getAnimImage();
+
+    int getX();
+
+    int getY();
+
+    int getWidth();
+
+    int getHeight();
+
+    float getAlpha();
+
+    void setFocus();
+
+    void focusOut();
+
+    void onUp();
+
+    void onDown();
+
+    void onLeft();
+
+    void onRight();
+
+    void onPush();
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/ObjectField.java b/core/src/main/java/dev/quoije/umd/rco/ObjectField.java
new file mode 100644
index 0000000..966580c
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/ObjectField.java
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/** Orders the typed fields of an RCO object record for serialization. */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface ObjectField {
+    int order();
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/RcoContext.java b/core/src/main/java/dev/quoije/umd/rco/RcoContext.java
new file mode 100644
index 0000000..ef6149b
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/RcoContext.java
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco;
+
+import dev.quoije.umd.rco.object.BaseObject;
+import dev.quoije.umd.rco.object.ImageObject;
+
+import java.util.Map;
+
+/**
+ * Mutable read cursor and shared reference tables used when deserializing
+ * RCO object and animation records.
+ */
+public final class RcoContext {
+
+    public byte[] buffer;
+    public int offset;
+    public Map<Integer, String> events;
+    public Map<Integer, ImageObject> images;
+    public Map<Integer, BaseObject> objects;
+
+    public RcoContext(byte[] buffer, int offset, Map<Integer, String> events,
+                      Map<Integer, ImageObject> images, Map<Integer, BaseObject> objects) {
+        this.buffer = buffer;
+        this.offset = offset;
+        this.events = events;
+        this.images = images;
+        this.objects = objects;
+    }
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/object/BaseObject.java b/core/src/main/java/dev/quoije/umd/rco/object/BaseObject.java
new file mode 100644
index 0000000..522353d
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/object/BaseObject.java
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.object;
+
+import dev.quoije.umd.rco.Display;
+import dev.quoije.umd.rco.ObjectField;
+import dev.quoije.umd.rco.RcoContext;
+import dev.quoije.umd.rco.RcoFile;
+import dev.quoije.umd.rco.type.BaseType;
+import dev.quoije.umd.rco.type.EventType;
+import dev.quoije.umd.rco.vsmx.interpreter.VsmxBaseObject;
+import dev.quoije.umd.rco.vsmx.interpreter.VsmxInterpreter;
+import dev.quoije.umd.rco.vsmx.interpreter.VsmxNativeObject;
+import dev.quoije.umd.rco.vsmx.interpreter.VsmxString;
+import dev.quoije.umd.rco.vsmx.objects.BaseNativeObject;
+import dev.quoije.umd.rco.vsmx.objects.Controller;
+
+import java.lang.reflect.Field;
+import java.util.Arrays;
+import java.util.Comparator;
+
+/**
+ * Base of RCO object records (pages, planes, buttons, ...). Fields are
+ * declared as {@link BaseType} subclasses and read/measured via reflection,
+ * mirroring JPCSP's object model.
+ */
+public abstract class BaseObject extends BaseNativeObject implements IDisplay {
+
+    protected Display display;
+    protected Controller controller;
+    private String name;
+    private BaseNativeObject parent;
+
+    private Field[] getSortedFields() {
+        Field[] fields = getClass().getFields();
+        Arrays.sort(fields, Comparator.comparingInt(f -> {
+            ObjectField annotation = f.getAnnotation(ObjectField.class);
+            return annotation == null ? Integer.MAX_VALUE : annotation.order();
+        }));
+        return fields;
+    }
+
+    /** Deserializes all typed fields from the record data. */
+    public void read(RcoContext context) {
+        for (Field field : getSortedFields()) {
+            if (BaseType.class.isAssignableFrom(field.getType())) {
+                try {
+                    BaseType type = (BaseType) field.get(this);
+                    if (type == null) {
+                        type = (BaseType) field.getType().getDeclaredConstructor().newInstance();
+                        field.set(this, type);
+                    }
+                    type.read(context);
+                } catch (ReflectiveOperationException e) {
+                    // Ignore
+                }
+            }
+        }
+    }
+
+    /** Size in bytes of the serialized typed fields. */
+    public int size() {
+        int size = 0;
+        for (Field field : getSortedFields()) {
+            if (BaseType.class.isAssignableFrom(field.getType())) {
+                try {
+                    BaseType type = (BaseType) field.get(this);
+                    if (type == null) {
+                        type = (BaseType) field.getType().getDeclaredConstructor().newInstance();
+                    }
+                    size += type.size();
+                } catch (ReflectiveOperationException e) {
+                    // Ignore
+                }
+            }
+        }
+        return size;
+    }
+
+    /** Resolves reference fields against the RCO tables. */
+    public void init(RcoContext context) {
+        for (Field field : getSortedFields()) {
+            if (BaseType.class.isAssignableFrom(field.getType())) {
+                try {
+                    BaseType type = (BaseType) field.get(this);
+                    if (type != null) {
+                        type.init(context);
+                    }
+                } catch (ReflectiveOperationException e) {
+                    // Ignore
+                }
+            }
+        }
+    }
+
+    /** Creates the VSMX-side object and registers it under the entry label. */
+    public VsmxBaseObject createVsmxObject(VsmxInterpreter interpreter, VsmxBaseObject parent, RcoFile.Entry entry) {
+        VsmxNativeObject object = new VsmxNativeObject(interpreter, this);
+        setObject(object);
+        if (entry.label != null) {
+            name = entry.label;
+            object.setPropertyValue("name", new VsmxString(interpreter, entry.label));
+            parent.setPropertyValue(entry.label, object);
+        }
+        if (entry.parent != null && entry.parent.vsmxObject instanceof VsmxNativeObject parentNative) {
+            setParent(parentNative.getObject());
+        }
+        return object;
+    }
+
+    public void setDisplay(Display display) {
+        this.display = display;
+    }
+
+    public void setController(Controller controller) {
+        this.controller = controller;
+    }
+
+    public BaseNativeObject getParent() {
+        return parent;
+    }
+
+    public void setParent(BaseNativeObject parent) {
+        this.parent = parent;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    protected void trigger(EventType event) {
+        if (event.getEvent() != null && controller != null) {
+            controller.getInterpreter().interpretScript(getObject(), event.getEvent());
+        }
+    }
+
+    protected void onDisplayUpdated() {
+        if (display != null) {
+            display.repaint();
+        }
+    }
+
+    @Override
+    public Object getImage() {
+        return null;
+    }
+
+    @Override
+    public Object getAnimImage() {
+        return getImage();
+    }
+
+    @Override
+    public int getX() {
+        return 0;
+    }
+
+    @Override
+    public int getY() {
+        return 0;
+    }
+
+    @Override
+    public int getWidth() {
+        return 0;
+    }
+
+    @Override
+    public int getHeight() {
+        return 0;
+    }
+
+    @Override
+    public float getAlpha() {
+        return 1f;
+    }
+
+    @Override
+    public void setFocus() {
+    }
+
+    @Override
+    public void focusOut() {
+    }
+
+    @Override
+    public void onUp() {
+    }
+
+    @Override
+    public void onDown() {
+    }
+
+    @Override
+    public void onLeft() {
+    }
+
+    @Override
+    public void onRight() {
+    }
+
+    @Override
+    public void onPush() {
+    }
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName() + "[name=" + name + "]";
+    }
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/object/ImageObject.java b/core/src/main/java/dev/quoije/umd/rco/object/ImageObject.java
new file mode 100644
index 0000000..9377a4a
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/object/ImageObject.java
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.object;
+
+/** An image entry from the RCO IMG table (raw bytes until decoded by the UI). */
+public final class ImageObject {
+
+    private final byte[] data;
+
+    public ImageObject(byte[] data) {
+        this.data = data;
+    }
+
+    public byte[] getData() {
+        return data;
+    }
+
+    /** Returns the decoded image, or null (decoded lazily by the renderer). */
+    public Object getImage() {
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return "ImageObject[" + (data == null ? 0 : data.length) + " bytes]";
+    }
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/BaseReferenceType.java b/core/src/main/java/dev/quoije/umd/rco/type/BaseReferenceType.java
new file mode 100644
index 0000000..017c090
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/BaseReferenceType.java
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+import dev.quoije.umd.rco.RcoContext;
+import dev.quoije.umd.rco.object.BaseObject;
+import dev.quoije.umd.rco.object.ImageObject;
+
+/**
+ * An 8-byte reference field: a 16-bit reference type, a 16-bit unknown
+ * value, and a 32-bit reference index.
+ */
+public class BaseReferenceType extends BaseType {
+
+    public static final int REFERENCE_TYPE_NONE = 0xFFFF;
+    public static final int REFERENCE_TYPE_EVENT = 0x400;
+    public static final int REFERENCE_TYPE_TEXT = 0x401;
+    public static final int REFERENCE_TYPE_IMAGE = 0x402;
+    public static final int REFERENCE_TYPE_MODEL = 0x403;
+    public static final int REFERENCE_TYPE_FONT = 0x405;
+    public static final int REFERENCE_TYPE_OBJECT = 0x407;
+    public static final int REFERENCE_TYPE_ANIM = 0x408;
+    public static final int REFERENCE_TYPE_POSITION_OBJECT = 0x409;
+
+    public int referenceType;
+    public int unknownShort;
+    protected String event;
+    protected BaseObject object;
+    protected ImageObject image;
+
+    @Override
+    public int size() {
+        return 8;
+    }
+
+    @Override
+    public void read(RcoContext context) {
+        referenceType = read16(context);
+        unknownShort = read16(context);
+        super.read(context);
+    }
+
+    @Override
+    public void init(RcoContext context) {
+        switch (referenceType) {
+            case REFERENCE_TYPE_NONE -> { }
+            case REFERENCE_TYPE_EVENT -> event = context.events.get(value);
+            case REFERENCE_TYPE_OBJECT, REFERENCE_TYPE_POSITION_OBJECT, REFERENCE_TYPE_ANIM ->
+                    object = context.objects.get(value);
+            case REFERENCE_TYPE_IMAGE -> image = context.images.get(value);
+            default -> { }
+        }
+        super.init(context);
+    }
+
+    public String getEvent() {
+        return event;
+    }
+
+    public BaseObject getObject() {
+        return object;
+    }
+
+    public ImageObject getImage() {
+        return image;
+    }
+
+    @Override
+    public String toString() {
+        return "referenceType=0x" + Integer.toHexString(referenceType)
+                + ", short1=0x" + Integer.toHexString(unknownShort)
+                + ", value=0x" + Integer.toHexString(value);
+    }
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/BaseType.java b/core/src/main/java/dev/quoije/umd/rco/type/BaseType.java
new file mode 100644
index 0000000..6522f54
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/BaseType.java
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+import dev.quoije.umd.rco.RcoContext;
+
+/** Base of the typed fields inside an RCO object record. */
+public class BaseType {
+
+    protected int value;
+
+    public int size() {
+        return 4;
+    }
+
+    protected int read8(RcoContext context) {
+        return context.buffer[context.offset++] & 0xFF;
+    }
+
+    protected int read16(RcoContext context) {
+        return read8(context) | (read8(context) << 8);
+    }
+
+    protected int read32(RcoContext context) {
+        return read16(context) | (read16(context) << 16);
+    }
+
+    public void read(RcoContext context) {
+        value = read32(context);
+    }
+
+    public void init(RcoContext context) {
+    }
+
+    public int getIntValue() {
+        return value;
+    }
+
+    public void setIntValue(int value) {
+        this.value = value;
+    }
+
+    public float getFloatValue() {
+        return (float) value;
+    }
+
+    public void setFloatValue(float value) {
+        this.value = (int) value;
+    }
+
+    @Override
+    public String toString() {
+        return "value=0x" + Integer.toHexString(getIntValue());
+    }
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/EventType.java b/core/src/main/java/dev/quoije/umd/rco/type/EventType.java
new file mode 100644
index 0000000..975c5d1
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/EventType.java
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** Reference to a script event. */
+public class EventType extends BaseReferenceType {
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/FloatType.java b/core/src/main/java/dev/quoije/umd/rco/type/FloatType.java
new file mode 100644
index 0000000..c4e1a03
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/FloatType.java
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** A 32-bit floating-point field stored as IEEE 754 bits. */
+public class FloatType extends BaseType {
+
+    @Override
+    public float getFloatValue() {
+        return Float.intBitsToFloat(super.getIntValue());
+    }
+
+    @Override
+    public void setFloatValue(float value) {
+        super.setIntValue(Float.floatToRawIntBits(value));
+    }
+
+    @Override
+    public int getIntValue() {
+        return (int) getFloatValue();
+    }
+
+    @Override
+    public void setIntValue(int value) {
+        setFloatValue((float) value);
+    }
+
+    @Override
+    public String toString() {
+        return "value=" + getFloatValue();
+    }
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/ImageType.java b/core/src/main/java/dev/quoije/umd/rco/type/ImageType.java
new file mode 100644
index 0000000..b262dab
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/ImageType.java
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** Reference to an image entry. */
+public class ImageType extends BaseReferenceType {
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/IntType.java b/core/src/main/java/dev/quoije/umd/rco/type/IntType.java
new file mode 100644
index 0000000..674f8ba
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/IntType.java
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** A 32-bit integer field. */
+public class IntType extends BaseType {
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/ModelType.java b/core/src/main/java/dev/quoije/umd/rco/type/ModelType.java
new file mode 100644
index 0000000..59ea6b6
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/ModelType.java
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** Reference to a model entry. */
+public class ModelType extends BaseReferenceType {
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/ObjectType.java b/core/src/main/java/dev/quoije/umd/rco/type/ObjectType.java
new file mode 100644
index 0000000..e2f3742
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/ObjectType.java
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** Reference to an object entry. */
+public class ObjectType extends BaseReferenceType {
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/RefType.java b/core/src/main/java/dev/quoije/umd/rco/type/RefType.java
new file mode 100644
index 0000000..c44b8f5
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/RefType.java
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** Reference to an arbitrary RCO entry. */
+public class RefType extends BaseReferenceType {
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/TextType.java b/core/src/main/java/dev/quoije/umd/rco/type/TextType.java
new file mode 100644
index 0000000..d6e782a
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/TextType.java
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** Reference to a text entry. */
+public class TextType extends BaseReferenceType {
+}
diff --git a/core/src/main/java/dev/quoije/umd/rco/type/UnknownType.java b/core/src/main/java/dev/quoije/umd/rco/type/UnknownType.java
new file mode 100644
index 0000000..ecfe45b
--- /dev/null
+++ b/core/src/main/java/dev/quoije/umd/rco/type/UnknownType.java
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+package dev.quoije.umd.rco.type;
+
+/** A 32-bit field of unknown semantics. */
+public class UnknownType extends BaseType {
+}