Floppies work! Inserting is a bit jank and the disk drives state is NOT FULLY SAVED.

src/main/java/net/brokenmoon/redcontrol/RedControl.java

@@ -10,6 +10,7 @@ import net.brokenmoon.redcontrol.item.FloppyDisk;
 import net.fabricmc.api.ModInitializer;
 
 import net.fabricmc.fabric.api.item.v1.FabricItemSettings;
+import net.fabricmc.fabric.api.itemgroup.v1.FabricItemGroup;
 import net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking;
 import net.fabricmc.fabric.api.object.builder.v1.block.FabricBlockSettings;
 import net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder;
@@ -19,11 +20,15 @@ import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.block.entity.BlockEntityType;
 import net.minecraft.item.BlockItem;
 import net.minecraft.item.Item;
+import net.minecraft.item.ItemGroup;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.registry.Registry;
 import net.minecraft.registry.Registries;
 import net.minecraft.resource.Resource;
 import net.minecraft.resource.ResourceManager;
 import net.minecraft.resource.ResourceType;
+import net.minecraft.text.Text;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.math.BlockPos;
 import org.slf4j.Logger;
@@ -47,14 +52,54 @@ public class RedControl implements ModInitializer {
 
 	//Items
 	public static final FloppyDisk FLOPPY_ITEM = new FloppyDisk(new FabricItemSettings().maxCount(1));
+	public static final Item SQUEAKY_HAMMER = new Item(new FabricItemSettings());
+
+	//Item Stacks
+	public static final ItemStack BASIC_DISK = new ItemStack(FLOPPY_ITEM);
+	public static final NbtCompound BASIC_NBT = new NbtCompound();
+
+	public static final ItemStack SLIDESHOW_DISK = new ItemStack(FLOPPY_ITEM);
+	public static final NbtCompound SLIDESHOW_NBT = new NbtCompound();
+
+	//Item group
+	public static final ItemGroup ITEM_GROUP = FabricItemGroup.builder()
+			.icon(() -> new ItemStack(CPU))
+			.displayName(Text.translatable("itemGroup.redControl.group"))
+			.entries(((displayContext, entries) -> {
+				//Peripherals
+				entries.add(CPU);
+				entries.add(TERMINAL);
+				entries.add(DRIVE);
+
+				//Tools
+				entries.add(SQUEAKY_HAMMER);
+
+				//Disks
+				//Blank
+				entries.add(FLOPPY_ITEM);
+				//Basic
+				BASIC_NBT.putString("uri", "img://basic.img");
+				BASIC_NBT.putString("serial", "BASIC");
+				BASIC_NBT.putInt("CustomModelData", 1);
+				BASIC_DISK.setNbt(BASIC_NBT);
+				BASIC_DISK.setCustomName(Text.literal("Basic boot disk"));
+				entries.add(BASIC_DISK);
+
+				//Slideshow
+				SLIDESHOW_NBT.putString("uri", "img://slideshow.img");
+				SLIDESHOW_NBT.putString("serial", "SLIDESHOW");
+				SLIDESHOW_NBT.putInt("CustomModelData", 2);
+				SLIDESHOW_DISK.setNbt(SLIDESHOW_NBT);
+				SLIDESHOW_DISK.setCustomName(Text.literal("Slideshow disk"));
+				entries.add(SLIDESHOW_DISK);
+			}))
+			.build();
 
 	//Block Entities
 	public static final BlockEntityType<CpuEntity> CPU_BLOCK_ENTITY = Registry.register(Registries.BLOCK_ENTITY_TYPE, modloc("cpu_block_entity"), FabricBlockEntityTypeBuilder.create(CpuEntity::new, CPU).build());
 	public static final BlockEntityType<TerminalEntity> TERMINAL_BLOCK_ENTITY = Registry.register(Registries.BLOCK_ENTITY_TYPE, modloc("monitor_block_entity"), FabricBlockEntityTypeBuilder.create(TerminalEntity::new, TERMINAL).build());
 	public static final BlockEntityType<DriveEntity> DRIVE_BLOCK_ENTITY = Registry.register(Registries.BLOCK_ENTITY_TYPE, modloc("drive_block_entity"), FabricBlockEntityTypeBuilder.create(DriveEntity::new, DRIVE).build());
 
-	public static final Item SQUEAKY_HAMMER = new Item(new FabricItemSettings());
-
 	@Override
 	public void onInitialize() {
 		// This code runs as soon as Minecraft is in a mod-load-ready state.
@@ -92,6 +137,7 @@ public class RedControl implements ModInitializer {
 		Registry.register(Registries.ITEM, modloc("disk_drive"), new BlockItem(DRIVE, new FabricItemSettings()));
 		Registry.register(Registries.ITEM, modloc("squeaky_hammer"), SQUEAKY_HAMMER);
 		Registry.register(Registries.ITEM, modloc("floppy_disk"), FLOPPY_ITEM);
+		Registry.register(Registries.ITEM_GROUP, modloc("item_group"), ITEM_GROUP);
 
 		//Packets
 		ServerPlayNetworking.registerGlobalReceiver(RedControlNetworking.CPU_START, ((server, player, handler, buf, responseSender) -> server.execute(() -> {

src/main/java/net/brokenmoon/redcontrol/blockentities/DriveEntity.java

@@ -6,6 +6,8 @@ import net.brokenmoon.redcontrol.api.DriveFactory;
 import net.minecraft.block.BlockState;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NbtCompound;
+import net.minecraft.text.Text;
 import net.minecraft.util.ActionResult;
 import net.minecraft.util.Hand;
 import net.minecraft.util.math.BlockPos;
@@ -87,6 +89,7 @@ public class DriveEntity extends Peripheral{
                         this.buffer.position(0);
                         byte[] diskName = new byte[SECTOR_SIZE];
                         this.buffer.get(diskName);
+                        this.disk.setCustomName(Text.literal(new String(diskName).trim()));
                         this.driver.writeDiskName(diskName);
                         this.command = 0;
                         break;
@@ -147,8 +150,21 @@ public class DriveEntity extends Peripheral{
         disk = player.getStackInHand(hand).copy();
         player.setStackInHand(hand, ItemStack.EMPTY);
         RedControl.LOGGER.info("Loading with " + disk.getNbt().get("uri"));
-        this.driver = DriveFactory.INSTANCE.createDriver(URI.create(disk.getNbt().getString("uri")), String.valueOf(disk.getName()),disk.getNbt().getString("serial"));
+        this.driver = DriveFactory.INSTANCE.createDriver(URI.create(disk.getNbt().getString("uri")), String.valueOf(disk.getName()), disk.getNbt().getString("serial"));
         this.buffer = ByteBuffer.allocateDirect(SECTOR_SIZE);
         return ActionResult.SUCCESS;
     }
+
+    @Override
+    protected void writeNbt(NbtCompound nbt) {
+        //SUPER DUPER NOT DONE TODO: FINISH THIS.
+        disk.writeNbt(nbt);
+        super.writeNbt(nbt);
+    }
+
+    @Override
+    public void readNbt(NbtCompound nbt) {
+        disk = ItemStack.fromNbt(nbt);
+        super.readNbt(nbt);
+    }
 }

src/main/java/net/brokenmoon/redcontrol/blocks/CpuBlock.java

@@ -53,6 +53,7 @@ public class CpuBlock extends NetworkCarrier {
                 player.sendMessage(Text.literal("  " + Integer.toHexString(peripheral.core.cpu.getBus().getRedBus().hashCode())), false);
                 player.sendMessage(Text.literal("  " + Integer.toHexString(peripheral.i)), false);
                 player.sendMessage(Text.literal("  " + peripheral.core.isWaitingOnInterrupt()), false);
+                player.sendMessage(Text.literal(" " + peripheral.core.cpu.getCpuState().toTraceEvent()));
             }
             PacketByteBuf byteBuf = PacketByteBufs.create();
             byteBuf.writeBlockPos(pos);

src/main/resources/assets/redcontrol/lang/en_us.json

@@ -1,5 +1,6 @@
 {
   "item.redcontrol.squeaky_hammer": "Squeaky Hammer",
+  "item.redcontrol.floppy_disk": "Floppy Disk",
   "block.redcontrol.cpu": "Central Processing Unit",
   "block.redcontrol.disk_drive": "Disk drive",
   "block.redcontrol.monitor": "Monitor"

src/main/resources/assets/redcontrol/models/item/basic_floppy_disk.json

@@ -0,0 +1,6 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": {
+    "layer0": "redcontrol:item/basic_floppy_disk"
+  }
+}

src/main/resources/assets/redcontrol/models/item/floppy_disk.json

@@ -0,0 +1,11 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": {
+    "layer0": "redcontrol:item/floppy_disk"
+  },
+  "overrides": [
+    { "predicate": { "custom_model_data": 1}, "model": "redcontrol:item/basic_floppy_disk" },
+    { "predicate": { "custom_model_data": 2}, "model": "redcontrol:item/slideshow_floppy_disk" },
+    { "predicate": { "custom_model_data": 3}, "model": "redcontrol:item/read_only_floppy_disk" }
+  ]
+}

src/main/resources/assets/redcontrol/models/item/read_only_floppy_disk.json

@@ -0,0 +1,6 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": {
+    "layer0": "redcontrol:item/read_only_floppy_disk"
+  }
+}

src/main/resources/assets/redcontrol/models/item/slideshow_floppy_disk.json

@@ -0,0 +1,6 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": {
+    "layer0": "redcontrol:item/slideshow_floppy_disk"
+  }
+}