diff --git a/src/main/fragment/mos6502-common/vbsaa_gt_vbsc1_then_la1.asm b/src/main/fragment/mos6502-common/vbsaa_gt_vbsc1_then_la1.asm
new file mode 100644
index 000000000..7f8b76ca9
--- /dev/null
+++ b/src/main/fragment/mos6502-common/vbsaa_gt_vbsc1_then_la1.asm
@@ -0,0 +1,8 @@
+sec
+sbc #{c1}
+beq !e+
+bvc !+
+eor #$80
+!:
+bpl {la1}
+!e:
\ No newline at end of file