diff --git a/src/main/fragment/mos6502-common/vduz1=_deref_pduc1_minus__deref_pduc2.asm b/src/main/fragment/mos6502-common/vduz1=_deref_pduc1_minus__deref_pduc2.asm
new file mode 100644
index 000000000..9d7a5b285
--- /dev/null
+++ b/src/main/fragment/mos6502-common/vduz1=_deref_pduc1_minus__deref_pduc2.asm
@@ -0,0 +1,13 @@
+sec
+lda {c1}
+sbc {c2}
+sta {z1}
+lda {c1}+1
+sbc {c2}+1
+sta {z1}+1
+lda {c1}+2
+sbc {c2}+2
+sta {z1}+2
+lda {c1}+3
+sbc {c2}+3
+sta {z1}+3