--- /dev/null
+.include "macros.inc"
+
+start
+
+test_name MODU_1
+mvi r1, 0
+mvi r2, 1
+modu r3, r1, r2
+check_r3 0
+
+test_name MODU_2
+mvi r1, 1
+mvi r2, 1
+modu r3, r1, r2
+check_r3 0
+
+test_name MODU_3
+mvi r1, 3
+mvi r2, 2
+modu r3, r1, r2
+check_r3 1
+
+test_name MODU_4
+mvi r1, 0
+mvi r2, 0
+modu r3, r1, r2
+check_excp 16
+
+test_name MODU_5
+load r1 0xabcdef12
+load r2 0x12345
+modu r3, r1, r2
+check_r3 0x3c12
+
+end