DC GD TOC spoof (OzOnE)

        9: begin    // Generate TOC reply.
            if (gd_addr == 3'd0) begin  // If in DATA reg (assuming Double-density TOC for now)...
                gd_oe <= !gd_rd_n;
                case (byte_count)
                    0: gd_data_write <= 16'hFFFF;   // Definitely sends 0xFFFF's first? (with DreamOn vol 6 GD-ROM).
                    2: gd_data_write <= 16'hFFFF;
                    4: gd_data_write <= 16'hFFFF;
                    6: gd_data_write <= 16'hFFFF;
                    8: gd_data_write <= 16'h0041;   // Data track (top nibble 4 == DATA track)...
                    10: gd_data_write <= 16'h5EB0;  // FAD 0x00B05E (45150, so LBA 45000).
                                                    // All "0xFFFF's" in between are sent by default case!
                    396: gd_data_write <= 16'h0341; // Start track (3).
                    398: gd_data_write <= 16'h0000;
                    400: gd_data_write <= 16'h0341; // End track (3).
                    402: gd_data_write <= 16'h0000;
                    404: gd_data_write <= 16'h0841; // Lead out.
                    406: gd_data_write <= 16'hB461; // FAD 0x0861B4 (549300, so LBA 549150 decimal)

                    default: gd_data_write <= 16'hffff; // All other words are 0xFFFF (important!).
                endcase