diff --git a/comdel/display/component_display.cpp b/comdel/display/component_display.cpp
index ba55739..f865f89 100644
--- a/comdel/display/component_display.cpp
+++ b/comdel/display/component_display.cpp
@@ -6,7 +6,6 @@
 #include <QMenu>
 #include <QLine>
 #include <QGraphicsSceneContextMenuEvent>
-#include <iostream>
 
 namespace display {
 
@@ -96,6 +95,18 @@ void Component::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) {
         return QGraphicsItem::itemChange(change, value);
     }
 
+    BusGroup::BusGroup(const std::shared_ptr<domain::BusInstance> &instance): busInstance(instance) {
+        setFlag(ItemIsMovable, true);
+        setFlag(ItemSendsGeometryChanges, true);
+
+        setHandlesChildEvents(false);
+
+        bus = new display::Bus(instance);
+        addToGroup(bus);
+
+        setPos(instance->position.first, instance->position.second);
+ }
+
 
     QVariant ComponentGroup::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value) {
         if (change == ItemPositionChange && scene()) {
diff --git a/comdel/display/component_display.h b/comdel/display/component_display.h
index f82d7c8..c7ac893 100644
--- a/comdel/display/component_display.h
+++ b/comdel/display/component_display.h
@@ -55,10 +55,10 @@ class Bus: public QGraphicsItemGroup
     std::shared_ptr<domain::BusInstance> busInstance;
 public:
     Bus(const std::shared_ptr<domain::BusInstance>& instance): busInstance(instance) {
-        instance->bus.getDisplay()->render(this);
+        instance->bus.getDisplayBus()->render(this, instance->size);
     }
+    domain::BusInstance *getBusInstance() { return busInstance.get(); }
     void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) override;
-
 };
 
 class ComponentGroup: public QGraphicsItemGroup
@@ -97,18 +97,12 @@ class BusGroup: public QGraphicsItemGroup
 {
 private:
     std::shared_ptr<domain::BusInstance> busInstance;
+    display::Bus* bus;
 
 public:
-    explicit BusGroup(const std::shared_ptr<domain::BusInstance>& instance): busInstance(instance) {
-        setFlag(ItemIsMovable, true);
-        setFlag(ItemSendsGeometryChanges, true);
+    explicit BusGroup(const std::shared_ptr<domain::BusInstance>& instance);
 
-        setHandlesChildEvents(false);
-
-        addToGroup(new display::Bus(instance));
-
-        setPos(instance->position.first, instance->position.second);
-    }
+    display::Bus* getBus() { return bus; }
 
 protected:
     virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);
diff --git a/comdel/display/schema_display.cpp b/comdel/display/schema_display.cpp
index 01f0b88..00b0ef1 100644
--- a/comdel/display/schema_display.cpp
+++ b/comdel/display/schema_display.cpp
@@ -38,7 +38,7 @@ void Schema::setSchema(domain::Schema* _schema, domain::Library* _library)
             scene.addItem(group);
         }
         for(auto &instance: schema->busInstances) {
-            if(instance->bus.getDisplay().has_value()) {
+            if(instance->bus.getDisplayBus().has_value()) {
                 auto group = new display::BusGroup(instance);
                 buses.insert(std::make_pair(instance->name, group));
                 scene.addItem(group);
@@ -110,7 +110,7 @@ void Schema::updateConnections() {
 
             auto currentPos = this->mapToScene(event->pos());
 
-            auto instance = std::make_shared<domain::BusInstance>(bus.getName(), std::make_pair(currentPos.x(), currentPos.y()), bus, 50);
+            auto instance = std::make_shared<domain::BusInstance>(bus.getName(), std::make_pair(currentPos.x(), currentPos.y()), bus);
             schema->busInstances.push_back(instance);
 
             auto group = new display::BusGroup(instance);
diff --git a/comdel/domain/bus.cpp b/comdel/domain/bus.cpp
index 4492014..683ad05 100644
--- a/comdel/domain/bus.cpp
+++ b/comdel/domain/bus.cpp
@@ -26,8 +26,8 @@ Wire::WireType Wire::getType() {
     return type;
 }
 
-Bus::Bus(std::string name, std::string tooltip, BusType type, std::pair<int, int> count, std::vector<Wire> wires, std::optional<Display> display)
-    : name(name), tooltip(tooltip), type(type), count(count), wires(wires), display(display)
+Bus::Bus(std::string name, std::string tooltip, BusType type, std::pair<int, int> count, std::vector<Wire> wires, std::optional<ui::Bus> displayBus)
+    : name(name), tooltip(tooltip), type(type), count(count), wires(wires), displayBus(displayBus)
 {}
 
 std::string Bus::getName() {
@@ -42,12 +42,11 @@ Bus::BusType Bus::getType() {
 std::pair<int, int> Bus::getCount() {
     return count;
 }
-std::optional<Display> Bus::getDisplay() {
-    return display;
-}
 std::vector<Wire> Bus::getWires() {
     return wires;
 }
-
+std::optional<ui::Bus> Bus::getDisplayBus() {
+    return displayBus;
+}
 
 } // namespace domain
diff --git a/comdel/domain/bus.h b/comdel/domain/bus.h
index dbaab10..13d4386 100644
--- a/comdel/domain/bus.h
+++ b/comdel/domain/bus.h
@@ -55,18 +55,18 @@ private:
     BusType type;
 
     std::pair<int, int> count;
-    std::optional<Display> display;
+    std::optional<ui::Bus> displayBus;
     std::vector<Wire> wires;
 
 public:
-    Bus(std::string name, std::string tooltip, BusType type, std::pair<int, int> count, std::vector<Wire> wires, std::optional<Display> display = std::nullopt);
+    Bus(std::string name, std::string tooltip, BusType type, std::pair<int, int> count, std::vector<Wire> wires, std::optional<ui::Bus> display = std::nullopt);
 
     std::string getName();
     std::string getTooltip();
     BusType getType();
     std::pair<int, int> getCount();
     std::vector<Wire> getWires();
-    std::optional<Display> getDisplay();
+    std::optional<ui::Bus> getDisplayBus();
 };
 
 } // namespace domain
diff --git a/comdel/domain/comdel_generator.cpp b/comdel/domain/comdel_generator.cpp
index 03836dc..b9393b7 100644
--- a/comdel/domain/comdel_generator.cpp
+++ b/comdel/domain/comdel_generator.cpp
@@ -125,8 +125,8 @@ void generateBus(BusInstance *bus, ostream &buffer) {
     buffer << "\n";
     buffer << "\t\t// " << bus->name << " bus\n\n";
 
-    if(bus->bus.getDisplay().has_value()) {
-        bus->bus.getDisplay()->comdel(buffer, bus->position.first, bus->position.second, bus->size);
+    if(bus->bus.getDisplayBus().has_value()) {
+        bus->bus.getDisplayBus()->comdel(buffer, bus->position.first, bus->position.second, bus->size);
     }
 }
 
diff --git a/comdel/domain/display.h b/comdel/domain/display.h
index cc46f8f..ed87bee 100644
--- a/comdel/domain/display.h
+++ b/comdel/domain/display.h
@@ -20,7 +20,7 @@ public:
         group->addToGroup(new QGraphicsRectItem(x,y,w,h));
     }
 
-    void comdel(std::ostream &buffer, int x, int y, int size) {
+    void comdel(std::ostream &buffer, int x, int y) {
         buffer << "\t\trectangle {\n";
         buffer << "\t\t\tx: " << (this->x + x) << "; y: " << (this->y + y) << ";\n";
         buffer << "\t\t\tw: " << w << "; h: " << h << ";\n";
@@ -39,7 +39,7 @@ public:
         group->addToGroup(new QGraphicsLineItem(x1, y1, x2, y2));
     }
 
-    void comdel(std::ostream &buffer, int x, int y, int size) {
+    void comdel(std::ostream &buffer, int x, int y) {
         buffer << "\t\tline {\n";
         buffer << "\t\t\tx1: " << (x1 + x) << "; y1: " << (y1 + y) << ";\n";
         buffer << "\t\t\tx2: " << (x2 + x) << "; y2: " << (y2 + y) << ";\n";
@@ -47,36 +47,77 @@ public:
     }
 };
 
-enum Orientation {
+enum PinOrientation {
     LEFT, RIGHT, TOP, BOTTOM
 };
+enum BusOrientation {
+    VERTICAL, HORIZONTAL
+};
 
 enum PinType {
     IN, OUT, IN_OUT
 };
 
+
+class Bus {
+public:
+    int x, y, w, h;
+    BusOrientation orientation;
+
+    Bus(int x, int y, int w, int h, BusOrientation orientation): x(x), y(y), w(w), h(h), orientation(orientation) {}
+
+    void render(QGraphicsItemGroup *group, int size) {
+        if(orientation == HORIZONTAL) {
+            group->addToGroup(new QGraphicsRectItem(x,y,size, h));
+        } else {
+            group->addToGroup(new QGraphicsRectItem(x,y,w,size));
+        }
+    }
+
+    int getDefaultSize() {
+       if(orientation == HORIZONTAL) {
+           return w;
+       }  else {
+           return h;
+       }
+    }
+
+    void comdel(std::ostream &buffer, int x, int y, int size) {
+        buffer << "\t\trectangle {\n";
+        buffer << "\t\t\tx: " << (this->x + x) << "; y: " << (this->y + y) << ";\n";
+        if(orientation == HORIZONTAL) {
+            buffer << "\t\t\tw: " << size << "; h: " << h << ";\n";
+        } else {
+            buffer << "\t\t\tw: " << w << "; h: " << size << ";\n";
+        }
+        buffer << "\t\t}\n\n";
+    }
+
+};
+
+
 class Pin {
 public:
-    Orientation orientation;
+    PinOrientation orientation;
     PinType pinType;
     int x, y, w, h;
 
-    Pin(int x, int y, int w, int h, Orientation orientation, PinType pinType): x(x), y(y), w(w), h(h), orientation(orientation), pinType(pinType) {}
+    Pin(int x, int y, int w, int h, PinOrientation orientation, PinType pinType): x(x), y(y), w(w), h(h), orientation(orientation), pinType(pinType) {}
 
     void renderIn(QGraphicsItemGroup *group) {
         QPolygon polygon;
 
         switch (orientation) {
-            case Orientation::TOP:
+            case PinOrientation::TOP:
                 polygon << QPoint(x, y) << QPoint(x, y+h) << QPoint(x+w, y+h)  << QPoint(x+w, y) << QPoint(x+w/2, y+h/2);
                 break;
-            case Orientation::BOTTOM:
+            case PinOrientation::BOTTOM:
                 polygon << QPoint(x, y) << QPoint(x, y+h) << QPoint(x+w/2, y+h/2) << QPoint(x+w, y+h)  << QPoint(x+w, y);
                 break;
-            case Orientation::LEFT:
+            case PinOrientation::LEFT:
                 polygon << QPoint(x, y) << QPoint(x+w/2, y+h/2) << QPoint(x, y+h) << QPoint(x+w, y+h)  << QPoint(x+w, y);
                 break;
-            case Orientation::RIGHT:
+            case PinOrientation::RIGHT:
                 polygon << QPoint(x, y) << QPoint(x, y+h) << QPoint(x+w, y+h) << QPoint(x+w/2, y+h/2) << QPoint(x+w, y);
                 break;
         }
@@ -87,16 +128,16 @@ public:
         QPolygon polygon;
 
         switch (orientation) {
-            case Orientation::TOP:
+            case PinOrientation::TOP:
                 polygon << QPoint(x, y+h/2) << QPoint(x, y+h) << QPoint(x+w, y+h) << QPoint(x+w, y+h/2) << QPoint(x+w/2, y);
                 break;
-            case Orientation::BOTTOM:
+            case PinOrientation::BOTTOM:
                 polygon << QPoint(x, y) << QPoint(x, y+h/2) << QPoint(x+w/2, y+h) << QPoint(x+w, y+h/2) << QPoint(x+w, y);
                 break;
-            case Orientation::LEFT:
+            case PinOrientation::LEFT:
                 polygon << QPoint(x+w, y) << QPoint(x+w/2, y) << QPoint(x, y+h/2) << QPoint(x+w/2, y+h) << QPoint(x+w, y+w);
                 break;
-            case Orientation::RIGHT:
+            case PinOrientation::RIGHT:
                 polygon << QPoint(x, y) << QPoint(x, y+h) << QPoint(x+w/2, y+h) << QPoint(x+w, y+h/2) << QPoint(x+w/2, y);
                 break;
         }
@@ -123,12 +164,12 @@ public:
 
     int getConnectionX() {
         switch (orientation) {
-            case ui::Orientation::TOP:
-            case ui::Orientation::BOTTOM:
+            case ui::PinOrientation::TOP:
+            case ui::PinOrientation::BOTTOM:
                 return x+w/2;
-            case ui::Orientation::LEFT:
+            case ui::PinOrientation::LEFT:
                 return x;
-            case ui::Orientation::RIGHT:
+            case ui::PinOrientation::RIGHT:
                 return x+w;
         }
         return 0;
@@ -136,12 +177,12 @@ public:
 
     int getConnectionY() {
         switch (orientation) {
-            case ui::Orientation::LEFT:
-            case ui::Orientation::RIGHT:
+            case ui::PinOrientation::LEFT:
+            case ui::PinOrientation::RIGHT:
                 return y+h/2;
-            case ui::Orientation::TOP:
+            case ui::PinOrientation::TOP:
                 return y;
-            case ui::Orientation::BOTTOM:
+            case ui::PinOrientation::BOTTOM:
                 return y+h;
         }
         return 0;
@@ -151,21 +192,25 @@ public:
 
 class Item {
 public:
-    Item(): rect(std::nullopt), line(std::nullopt), pin(std::nullopt) {}
+    Item(): rect(std::nullopt), line(std::nullopt), pin(std::nullopt), bus(std::nullopt) {}
 
-    void render(QGraphicsItemGroup *group) {
+    void render(QGraphicsItemGroup *group, int size = 0) {
         if(rect) rect->render(group);
         if(line) line->render(group);
         if(pin) pin->render(group);
+        if(bus) bus->render(group, size);
     }
 
     std::optional<Rect> rect = std::nullopt;
     std::optional<Line> line = std::nullopt;
     std::optional<Pin> pin = std::nullopt;
+    std::optional<Bus> bus = std::nullopt;
 
-    void comdel(std::ostream &buffer, int x, int y, int size) {
-        if(rect) rect->comdel(buffer, x, y, size);
-        if(line) line->comdel(buffer, x, y, size);
+    void comdel(std::ostream &buffer, int x, int y, int size = 0) {
+        if(rect) rect->comdel(buffer, x, y);
+        if(line) line->comdel(buffer, x, y);
+        // pins aren't exported
+        if(bus) bus->comdel(buffer, x, y, size);
     }
 };
 
@@ -183,7 +228,7 @@ public:
         }
     }
 
-    void comdel(std::ostream &buffer, int x, int y, int size) {
+    void comdel(std::ostream &buffer, int x, int y, int size = 0) {
         for(auto &item: items) {
             item.comdel(buffer, x, y, size);
         }
diff --git a/comdel/domain/instance.cpp b/comdel/domain/instance.cpp
index 7deb689..77143da 100644
--- a/comdel/domain/instance.cpp
+++ b/comdel/domain/instance.cpp
@@ -4,7 +4,11 @@ namespace domain {
 
 BusInstance::BusInstance(std::string name, std::pair<int, int> position, Bus bus, int size)
     : name(name), position(position), bus(bus), size(size)
-{}
+{
+    if(size < 0 && bus.getDisplayBus().has_value()) {
+        this->size = bus.getDisplayBus()->getDefaultSize();
+    }
+}
 
     BusInstance::BusInstance(std::string name, Bus bus): name(name), bus(bus), position(0,0), size(0) {}
 
diff --git a/comdel/domain/instance.h b/comdel/domain/instance.h
index 38c158d..99428a0 100644
--- a/comdel/domain/instance.h
+++ b/comdel/domain/instance.h
@@ -23,7 +23,7 @@ public:
 
     BusInstance(std::string name, Bus bus);
 
-    BusInstance(std::string name, std::pair<int, int> position, Bus bus, int size);
+    BusInstance(std::string name, std::pair<int, int> position, Bus bus, int size = -1);
 
     virtual ~BusInstance() = default;
 };
diff --git a/comdel/domain/schemacreator.cpp b/comdel/domain/schemacreator.cpp
index 1d5d68c..089138f 100644
--- a/comdel/domain/schemacreator.cpp
+++ b/comdel/domain/schemacreator.cpp
@@ -210,12 +210,17 @@ std::optional<Bus> SchemaCreator::loadBus(BusNode node)
         return nullopt;
     }
 
-    optional<Display> display;
+    optional<ui::Bus> displayBus;
     if(type == Bus::REGULAR) {
-        display = loadDisplay(*node.display);
+        auto display = loadDisplay(*node.display);
         if(!display) {
             return nullopt;
         }
+        if(display->getItems().size() != 1 || !display->getItems()[0].bus.has_value()) {
+            errors.emplace_back(node.span, "@display must contain only exactly one bus definition");
+            return nullopt;
+        }
+        displayBus = *display->getItems()[0].bus;
     }
 
     if(node.wires.size() == 0) {
@@ -235,7 +240,7 @@ std::optional<Bus> SchemaCreator::loadBus(BusNode node)
         return nullopt;
     }
 
-    return Bus(name, tooltip, type, count, wires, display);
+    return Bus(name, tooltip, type, count, wires, displayBus);
 }
 
 
@@ -603,17 +608,17 @@ std::optional<Display> SchemaCreator::loadDisplay(DisplayNode node)
             std::string _orientation = item.asString(&errors, "orientation", "bottom");
             std::string _pinType = item.asString(&errors, "type", "out");
 
-            ui::Orientation orientation;
+            ui::PinOrientation orientation;
             if(_orientation == "left") {
-                orientation = ui::Orientation::LEFT;
+                orientation = ui::PinOrientation::LEFT;
             } else if(_orientation == "right") {
-                orientation = ui::Orientation::RIGHT;
+                orientation = ui::PinOrientation::RIGHT;
             } else if(_orientation == "top") {
-                orientation = ui::Orientation::TOP;
+                orientation = ui::PinOrientation::TOP;
             } else if(_orientation == "bottom") {
-                orientation = ui::Orientation::BOTTOM;
+                orientation = ui::PinOrientation::BOTTOM;
             } else {
-                errors.emplace_back(item.span, "unknown orientation type '" + _orientation + "'");
+                errors.emplace_back(item.span, "unknown pin orientation type '" + _orientation + "'");
             }
 
             ui::PinType pinType;
@@ -628,6 +633,24 @@ std::optional<Display> SchemaCreator::loadDisplay(DisplayNode node)
             }
 
             displayItem.pin = ui::Pin(x, y, w, h, orientation, pinType);
+        } else if(type == "bus") {
+            long long int x, y, w, h;
+            x = item.asInt(&errors, "x");
+            y = item.asInt(&errors, "y");
+            w = item.asInt(&errors, "w");
+            h = item.asInt(&errors, "h");
+            std::string _orientation = item.asString(&errors, "orientation", "bottom");
+
+            ui::BusOrientation orientation;
+            if(_orientation == "horizontal") {
+                orientation = ui::BusOrientation::HORIZONTAL;
+            } else if(_orientation == "vertical") {
+                orientation = ui::BusOrientation::VERTICAL;
+            } else {
+                errors.emplace_back(item.span, "unknown bus orientation type '" + _orientation + "'");
+            }
+
+            displayItem.bus = ui::Bus(x, y, w, h, orientation);
         } else {
             errors.emplace_back(item.type.span, "unsupported display type");
         }
diff --git a/examples/simplified FRISC model/frisc_library.csl b/examples/simplified FRISC model/frisc_library.csl
index 1c4560b..40580aa 100644
--- a/examples/simplified FRISC model/frisc_library.csl	
+++ b/examples/simplified FRISC model/frisc_library.csl	
@@ -310,9 +310,11 @@
             orientation: horizontal;
             lineColor: black;
         }*/
-        rect {
+        bus {
             x:0; y:0;
             h: 20; w: 100;
+            orientation: "horizontal";
+            resizable: true;
         }
     }
     @wires {