diff --git a/src/onbeyond/z3/z3.s b/src/onbeyond/z3/z3.s
index 2738718..df90d1f 100644
--- a/src/onbeyond/z3/z3.s
+++ b/src/onbeyond/z3/z3.s
@@ -117,6 +117,7 @@ op_c7
         stx     $302        ;no load
 +
 
+        jsr     $fe93
         ldx     $300
         cpx     #$ce
         beq     skip80
diff --git a/src/onbeyond/z4/z4.s b/src/onbeyond/z4/z4.s
index ba2c834..5c03e7a 100644
--- a/src/onbeyond/z4/z4.s
+++ b/src/onbeyond/z4/z4.s
@@ -369,8 +369,10 @@ slot            lda     $cfff
                 bne     okay80
 
 skip80
-                lda     #$2c
-                sta     call80
+                lda     #$93
+                sta     call80+1
+                lda     #$fe
+                sta     call80+2
                 lda     #$df
                 sta     inversemask+1
                 lda     #7
diff --git a/src/onbeyond/z5/z5.s b/src/onbeyond/z5/z5.s
index f533f0b..602f18f 100644
--- a/src/onbeyond/z5/z5.s
+++ b/src/onbeyond/z5/z5.s
@@ -364,8 +364,10 @@ slot            lda     $cfff
                 bne     okay80
 
 skip80
-                lda     #$2c
-                sta     call80
+                lda     #$93
+                sta     call80+1
+                lda     #$fe
+                sta     call80+2
                 lda     #$df
                 sta     inversemask+1
                 lda     #7