call me the abuser the way i be absuing nea

src/main/java/dev/exhq/ajarc/computer/ComputerBlockEntity.java

@@ -14,16 +14,13 @@ import net.minecraft.nbt.NbtOps;
 import net.minecraft.network.chat.Component;
 import net.minecraft.world.SimpleMenuProvider;
 import net.minecraft.world.entity.player.Player;
-import net.minecraft.world.level.block.PumpkinBlock;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
 import org.apache.commons.io.IOUtils;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.List;
 
 public class ComputerBlockEntity extends BlockEntity {
 	public ComputerBlockEntity(BlockPos pPos, BlockState pBlockState) {
@@ -40,7 +37,7 @@ public class ComputerBlockEntity extends BlockEntity {
 			.fieldOf("screen")
 			.setPartial(() -> ComputerTerminal.ofSize(20, 30));
 	JsVm jsVm = new JsVm(this);
-	private List<String> lines = new ArrayList<>();
+	private char[] chars = new char[screen.dimensions().columns() * screen.dimensions().rows()];
 
 	@Override
 	protected void loadAdditional(@NotNull CompoundTag pTag, @NotNull HolderLookup.Provider pRegistries) {
@@ -70,6 +67,17 @@ public class ComputerBlockEntity extends BlockEntity {
 		builder.build((CompoundTag) null).resultOrPartial(Ajar.LOGGER::error)
 		       .ifPresent(it -> pTag.merge((CompoundTag) it));
 	}
+	public void setScreenString(ComputerTerminal.Dimensions startingPos, String value){
+		var bytes = value.toCharArray();
+		System.arraycopy(chars, startingPos.rows() * screen.dimensions().columns() + startingPos.columns(), bytes, 0, Math.min(bytes.length, screen.dimensions().columns() - startingPos.columns()));
+	}
+
+	public void setScreenChar(ComputerTerminal.Dimensions dimensions, char value){
+		chars[dimensions.rows() * screen.dimensions().columns() + dimensions.rows()] = value;
+	}
+	public char getScreenChar(ComputerTerminal.Dimensions dimensions){
+		return chars[dimensions.rows() * screen.dimensions().columns() + dimensions.rows()];
+	}
 
 	public void openMenu(Player pPlayer) {
 		pPlayer.openMenu(new SimpleMenuProvider(
@@ -87,13 +95,13 @@ public class ComputerBlockEntity extends BlockEntity {
 	}
 
 	public void executeCommand(String line) {
-		lines.add("$ " + line);
+		setScreenChar(new ComputerTerminal.Dimensions(0,0), '$');
 		if (line.equals("small")) {
 			screen = ComputerTerminal.ofSize(10, 20);
-			lines.add("Made small!");
+			setScreenString(new ComputerTerminal.Dimensions(0,0), "Made small!");
 		} else if (line.equals("big")) {
 			screen = ComputerTerminal.ofSize(20, 30);
-			lines.add("Made big!");
+			setScreenString(new ComputerTerminal.Dimensions(0,0), "Made big!");
 		} else if (line.startsWith("resetfs")) {
 			var root = fileSystem.root().listing();
 			var directory = (AjarDirectory) root.compute("bin", (ignored, old) ->
@@ -124,12 +132,12 @@ public class ComputerBlockEntity extends BlockEntity {
 
 	public ComputerScreenUpdate getSyncPacket(int windowId) {
 		return new ComputerScreenUpdate(windowId,
-		                                lines,
+		                                chars,
 		                                screen.dimensions().rows(),
 		                                screen.dimensions().columns());
 	}
 
-	public void addLine(String line) {
+	public void addLine(ComputerTerminal.Dimensions dimensions, String line) {
-		lines.add(line);
+		setScreenString(dimensions, line);
 	}
 }

src/main/java/dev/exhq/ajarc/network/ComputerScreenUpdate.java

@@ -10,11 +10,10 @@ import net.neoforged.neoforge.network.handling.IPayloadContext;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
-import java.util.List;
 
 public record ComputerScreenUpdate(
 		int windowId,
-		List<String> lines,
+		char[] lines,
 		int rows,
 		int columns
 ) implements CustomPacketPayload {