From 472c60c02cdf980802d81d113915f58c823f7650 Mon Sep 17 00:00:00 2001
From: Tom Greene <tom@cowgod.org>
Date: Sun, 21 Nov 2021 16:50:00 -0500
Subject: [PATCH] Fix for Gumball demo crash on 6502 (#440)

---
 res/DEMO/GUMBALL   | Bin 175 -> 190 bytes
 src/demo/gumball.a |   7 +++++++
 2 files changed, 7 insertions(+)

diff --git a/res/DEMO/GUMBALL b/res/DEMO/GUMBALL
index beeec432e43690328e946a2adbf6315c27fa9d62..31e87340076a487a9eafccd93068750a4ae0d87b 100755
GIT binary patch
delta 93
zcmV-j0HXh|0lonmEQ7!-gTNrS-=YA9R)$rnyr2Rg@Bg9+y|R%SD>tQ$9<r%ljUTe9
z3XLGLsZ5Rg4XFT){0*rAjr|R&g^ke<sRE7C52arU&;!m14q&NFjVrRLmyvBkyfG>8

delta 78
zcmV-U0I~nR0j~iXEQ7!-gTNrS-=YA9R)$rnt)K!R@Bg9+y`zyDD=18j`wgi8jr<L%
k0ge3)sdkOg52*r;(hsFy3eW@22@YVXOpPnDsfdw$LRpF;kpKVy

diff --git a/src/demo/gumball.a b/src/demo/gumball.a
index 8e9bf7618..f62129045 100644
--- a/src/demo/gumball.a
+++ b/src/demo/gumball.a
@@ -37,6 +37,13 @@
          jmp   $B2F1      ; stage 1 (title screen and credits)
 
 callback1
+         lda   #$A5       ; restore original code so callback
+         sta   $B21E      ; won't be called more than once
+         lda   #$5F
+         sta   $B21F
+         lda   #$0A
+         sta   $B220
+
          lda   #$4C
          sta   $0DFB
          lda   #0