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diff --git a/vga-hacks/vga_adapter_sim.sv b/vga-hacks/vga_adapter_sim.sv
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+// For simulation only
+
+module vga_adapter(input logic resetn, input logic clock, input logic [2:0] colour,
+                   input logic [7:0] x, input logic [6:0] y, input logic plot,
+                   output logic [9:0] VGA_R, output logic [9:0] VGA_G, output logic [9:0] VGA_B,
+                   output logic VGA_HS, output logic VGA_VS, output logic VGA_BLANK,
+                   output logic VGA_SYNC, output logic VGA_CLK);
+    parameter BITS_PER_COLOUR_CHANNEL = 1;
+    parameter MONOCHROME = "FALSE";
+    parameter RESOLUTION = "320x240";
+    parameter BACKGROUND_IMAGE = "background.mif";
+    parameter USING_DE1 = "FALSE";
+
+    always_ff @(posedge clock, negedge resetn) begin
+        if (~resetn) begin
+            $display("VGA: reset");
+        end else if (plot) begin
+            $display("VGA: plot (%d,%d) colour %03b", x, y, colour);
+        end
+    end
+endmodule: vga_adapter
+