diff --git a/src/simulator/left_panel.odin b/src/simulator/left_panel.odin
index 9c8dedd..e4662de 100644
--- a/src/simulator/left_panel.odin
+++ b/src/simulator/left_panel.odin
@@ -1,8 +1,57 @@
 package simulator
 
-import m "../machine"
+import "core:strings"
+import "core:log"
 import rl "vendor:raylib"
 
-gui_left_panel :: proc(rect: rl.Rectangle, s: ^m.System) {
-	rl.DrawRectangleLinesEx(rect, 1, rl.DARKGRAY)
+gui_left_panel :: proc(rect: rl.Rectangle, sim: ^Simulator) {
+	top_panel := rl.Rectangle {
+		rect.x,
+		rect.y,
+		rect.width,
+		rect.height / 2,
+	}
+	rl.DrawRectangleLinesEx(top_panel, 1, rl.DARKGRAY)
+
+	bottom_panel := rl.Rectangle {
+		rect.x,
+		rect.y + top_panel.height,
+		rect.width,
+		rect.height / 2,
+	}
+	rl.DrawRectangleLinesEx(bottom_panel, 1, rl.GREEN)
+	gui_key_pad(bottom_panel, sim.machine.keypad, sim.font)
+}
+
+gui_key_pad :: proc(rect: rl.Rectangle, display: [16]bool, font: rl.Font)  {
+	Key :: struct { label: string, index: int}
+	keys := [16]Key {
+		{"1", 1}, {"2", 2}, {"3", 3}, {"C", 12},
+		{"4", 4}, {"5", 5}, {"6", 6}, {"D", 13},
+		{"7", 7}, {"8", 8}, {"9", 9}, {"D", 14},
+		{"A", 10}, {"0", 0}, {"B", 11}, {"F", 15}
+	} 
+
+	btn_width := f32(rect.width / 4)
+	btn_height := f32(rect.height / 4)
+
+	for val, idx in keys {
+		str := strings.clone_to_cstring(val.label)
+		ri := int(idx / 4) 
+		ci := idx % 4
+
+		irect := rl.Rectangle{
+			x = btn_width * f32(ci),
+			y = (btn_height * f32(ri)) + rect.y,
+			width = btn_width,
+			height = btn_height,
+		}
+
+		if(display[val.index]) { rl.DrawRectangleRec(irect, rl.DARKGRAY) }
+		rl.DrawRectangleLinesEx(irect, 1, rl.GRAY)
+		rl.DrawTextEx(font, str, rl.Vector2{irect.x + btn_width / 2, irect.y + btn_height / 2}, 18, 1, rl.WHITE)
+
+		// Free the allocations!
+		delete(str)
+	}	
 }