diff --git a/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt b/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
index 64c6b0008..493c49433 100644
--- a/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
+++ b/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
@@ -491,7 +491,7 @@ internal class AssignmentAsmGen(private val program: PtProgram,
                         cpy  P8ZP_SCRATCH_W1+1
                         bne  +
                         lda  #0
-                        bne  ++
+                        beq  ++
 +                       lda  #1
 +""")
                 }
diff --git a/compiler/test/comparisons/test_compares.p8 b/compiler/test/comparisons/test_compares.p8
new file mode 100644
index 000000000..e2ad47107
--- /dev/null
+++ b/compiler/test/comparisons/test_compares.p8
@@ -0,0 +1,120 @@
+%zeropage basicsafe
+%import textio
+
+main {
+    sub start() {
+        byte b = -100
+        ubyte ub = 20
+        word w = -20000
+        uword uw = 2000
+
+        txt.print("all 1: ")
+        txt.print_ub(b == -100)
+        txt.print_ub(b != -99)
+        txt.print_ub(b < -99)
+        txt.print_ub(b <= -100)
+        txt.print_ub(b > -101)
+        txt.print_ub(b >= -100)
+        txt.print_ub(ub ==20)
+        txt.print_ub(ub !=19)
+        txt.print_ub(ub <21)
+        txt.print_ub(ub <=20)
+        txt.print_ub(ub>19)
+        txt.print_ub(ub>=20)
+        txt.spc()
+        txt.print_ub(w == -20000)
+        txt.print_ub(w != -19999)
+        txt.print_ub(w < -19999)
+        txt.print_ub(w <= -20000)
+        txt.print_ub(w > -20001)
+        txt.print_ub(w >= -20000)
+        txt.print_ub(uw == 2000)
+        txt.print_ub(uw != 2001)
+        txt.print_ub(uw < 2001)
+        txt.print_ub(uw <= 2000)
+        txt.print_ub(uw > 1999)
+        txt.print_ub(uw >= 2000)
+        txt.nl()
+        txt.print("all 0: ")
+        txt.print_ub(b == -99)
+        txt.print_ub(b != -100)
+        txt.print_ub(b < -100)
+        txt.print_ub(b <= -101)
+        txt.print_ub(b > -100)
+        txt.print_ub(b >= -99)
+        txt.print_ub(ub ==21)
+        txt.print_ub(ub !=20)
+        txt.print_ub(ub <20)
+        txt.print_ub(ub <=19)
+        txt.print_ub(ub>20)
+        txt.print_ub(ub>=21)
+        txt.spc()
+        txt.print_ub(w == -20001)
+        txt.print_ub(w != -20000)
+        txt.print_ub(w < -20000)
+        txt.print_ub(w <= -20001)
+        txt.print_ub(w > -20000)
+        txt.print_ub(w >= -19999)
+        txt.print_ub(uw == 1999)
+        txt.print_ub(uw != 2000)
+        txt.print_ub(uw < 2000)
+        txt.print_ub(uw <= 1999)
+        txt.print_ub(uw > 2000)
+        txt.print_ub(uw >= 2001)
+        txt.nl()
+
+
+        b = -100
+        while b <= -20
+            b++
+        txt.print_b(b)
+        txt.print(" -19\n")
+        b = -100
+        while b < -20
+            b++
+        txt.print_b(b)
+        txt.print(" -20\n")
+
+        ub = 20
+        while ub <= 200
+            ub++
+        txt.print_ub(ub)
+        txt.print(" 201\n")
+        ub = 20
+        while ub < 200
+            ub++
+        txt.print_ub(ub)
+        txt.print(" 200\n")
+
+        w = -20000
+        while w <= -8000 {
+            w++
+        }
+        txt.print_w(w)
+        txt.print("  -7999\n")
+        w = -20000
+        while w < -8000 {
+            w++
+        }
+        txt.print_w(w)
+        txt.print("  -8000\n")
+
+        uw = 2000
+        while uw <= 8000 {
+            uw++
+        }
+        txt.print_uw(uw)
+        txt.print("  8001\n")
+        uw = 2000
+        while uw < 8000 {
+            uw++
+        }
+        txt.print_uw(uw)
+        txt.print("  8000\n")
+
+;        float f
+;        while f<2.2 {
+;            f+=0.1
+;        }
+    }
+}