z80: fix a condition check in the null handler

diff --git a/Kernel/lowlevel-z80.s b/Kernel/lowlevel-z80.s
index c2bc78f..44c2484 100644 (file)
--- a/Kernel/lowlevel-z80.s
+++ b/Kernel/lowlevel-z80.s
@@ -327,6 +327,7 @@ null_handler:
        or a
        jp nz, trap_illegal
        ld a, (_inint)
+       or a
        jp nz, trap_illegal
        ; user is merely not good
        ld hl, #7