diff --git a/Source/DSPSpy/tests/neg_test.ds b/Source/DSPSpy/tests/neg_test.ds
new file mode 100644
index 0000000000..01113c96cc
--- /dev/null
+++ b/Source/DSPSpy/tests/neg_test.ds
@@ -0,0 +1,110 @@
+; this test try to test for 1's mode
+incdir  "tests"
+include "dsp_base.inc"
+
+lri $ACC0, #0x0001
+lri $SR, #0x0001
+
+neg $ACC0
+call send_back 	; 1
+
+
+lri $ACC0, #0x0001
+lri $SR, #0x0002
+
+neg $ACC0
+call send_back 	; 2
+
+lri $ACC0, #0x0001
+lri $SR, #0x0004
+
+neg $ACC0
+call send_back 	; 3
+
+lri $ACC0, #0x0001
+lri $SR, #0x0008
+
+neg $ACC0
+call send_back 	; 4
+
+lri $ACC0, #0x0001
+lri $SR, #0x0010
+
+neg $ACC0
+call send_back 	; 5
+
+lri $ACC0, #0x0001
+lri $SR, #0x0020
+
+neg $ACC0
+call send_back 	; 6
+
+lri $ACC0, #0x0001
+lri $SR, #0x0040
+
+neg $ACC0
+call send_back 	; 7
+
+lri $ACC0, #0x0001
+lri $SR, #0x0080
+
+neg $ACC0
+call send_back 	; 8
+
+lri $ACC0, #0x0001
+lri $SR, #0x0100
+
+neg $ACC0
+call send_back 	; 9
+
+lri $ACC0, #0x0001
+lri $SR, #0x0200
+
+neg $ACC0
+call send_back 	; 10
+
+lri $ACC0, #0x0001
+lri $SR, #0x0400
+
+neg $ACC0
+call send_back 	; 11
+
+lri $ACC0, #0x0001
+lri $SR, #0x0800
+
+neg $ACC0
+call send_back 	; 12
+
+lri $ACC0, #0x0001
+lri $SR, #0x1000
+
+neg $ACC0
+call send_back 	; 13
+
+lri $ACC0, #0x0001
+lri $SR, #0x2000
+
+neg $ACC0
+call send_back 	; 14
+
+lri $ACC0, #0x0001
+lri $SR, #0x4000
+
+neg $ACC0
+call send_back 	; 15
+
+lri $ACC0, #0x0001
+lri $SR, #0x8000
+
+neg $ACC0
+call send_back 	; 16
+
+set16
+lri $ACC0, #0x0001
+lri $SR, #0x2230
+
+neg $ACC0
+set40
+call send_back ; 17
+
+