1 files changed, 1 insertions, 0 deletions
diff --git a/zruntime.S b/zruntime.S
index 02f817b..07953d8 100644
--- a/zruntime.S
+++ b/zruntime.S
@@ -68,6 +68,7 @@ z80_read_byte_noinc:
 	cmp $0x8000, %r13w
 	jae z80_read_bank
 	/* TODO: Bank reg, YM-2612, PSG/VDP */
+	mov $FF, $r13b
 	ret
 z80_read_ram:
 	and $0x1FFF, %r13