diff --git a/.gitignore b/.gitignore
index 5993001..176abe6 100755
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,15 @@ output/
 *.cdf
 *.qws
 
+## Testbench
+cpld_tb/ivl_vhdl_work/
+cpld_tb/work/
+cpld_tb/*.gtkw
+cpld_tb/*.vcd
+cpld_tb/*.bin
+cpld_tb/*.mem
+cpld_tb.*/
+
 ## Kicad
 *-lib-table
 *-cache
diff --git a/cpld_tb/Makefile b/cpld_tb/Makefile
new file mode 100644
index 0000000..54a380f
--- /dev/null
+++ b/cpld_tb/Makefile
@@ -0,0 +1,26 @@
+export PATH:=/opt/modelsim201/modelsim_ase/bin:/cygdrive/c/Hwdev/modelsim181/modelsim_ase/win32aloem:/cygdrive/c/Hwdev/iverilog/bin/:${PATH}
+
+all: testbench_zx_ula
+
+testbench_zx_ula: VSIMFLAGS+=+nowarn3722 +nowarn8822 +nowarn3017 +nowarn3155
+testbench_zx_ula: V=$@.v ../cpld/chroma_gen16.vhd
+
+testbench_memcontroller: V=testbench_memcontroller.v
+
+xtestbench_%:
+	iverilog -g2005-sv ${IVFLAGS} -o $@.vvp ${V}
+	vvp $@.vvp
+	@rm $@.vvp
+
+testbench_%:
+	test ! -d work || rm -rf work
+	vlib work
+	test ! -n "$(filter %.v,${V})" || vlog -quiet -sv $(filter %.v,${V})
+	test ! -n "$(filter %.vhd %.vhdl,${V})" || vcom -quiet $(filter %.vhd %.vhdl,${V})
+	vsim ${VSIMFLAGS} -batch -quiet -do 'run -all' $@
+	test ! -r transcript || rm transcript
+
+clean:
+	rm -rf ivl_vhdl_work/ work/ *.bin *.mem *.vcd
+
+-include Makefile.local
diff --git a/cpld_tb/testbench_zx_ula.v b/cpld_tb/testbench_zx_ula.v
new file mode 100644
index 0000000..d852312
--- /dev/null
+++ b/cpld_tb/testbench_zx_ula.v
@@ -0,0 +1,50 @@
+`define USE_FPGA
+`include "../cpld/top.v"
+
+`timescale 100ps/10ps 
+module testbench_zx_ula();
+
+reg rst_n;
+reg clk14;
+
+/* ULA */
+zx_ula zx_ula1(
+    .rst_n(rst_n),
+    .clk14(clk14)
+    );
+
+
+/* CLOCKS & RESET */
+initial begin
+    rst_n = 0;
+    #3000 rst_n = 1;
+end
+
+always begin
+    clk14 = 0;
+    #357 clk14 = 1;
+    #358;
+end 
+
+
+initial zx_ula1.hc0 = 0;
+initial zx_ula1.vc = 0;
+
+/* TESTBENCH CONTROL */
+initial begin
+    $dumpfile("testbench_zx_ula.vcd");
+    $dumpvars();
+    #5000000 $finish;
+    //#21000000 $finish;
+end
+
+
+always @(clk14) begin
+    // if (v > 100) $dumpoff;
+    // if (~n_iorq) $dumpon;
+    // if (v == 1 && ovf == 1) $finish;
+end
+
+
+
+endmodule