From 8274d0252b851209921c8d0e11005b3989b287f5 Mon Sep 17 00:00:00 2001
From: Oliver Schmidt
Date: Sat, 11 Jan 2020 14:55:13 +0100
Subject: [PATCH] Initialize backLayer.
The zeropage variable backLayer was uninitialized. The program only happened to work if $0090 happened to be $00 (or $01 ?) on startup.
---
src/apple2/penetrator.asm | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/apple2/penetrator.asm b/src/apple2/penetrator.asm
index 9a67c63..34bfe65 100644
--- a/src/apple2/penetrator.asm
+++ b/src/apple2/penetrator.asm
@@ -72,6 +72,8 @@ store:
dex
bpl :-
+ sta backLayer ; set back layer to 0
+
ldx #((BitMasksEnd - BitMasks) - 1)
:
lda BitMasks, x