From f782b5d41c1bf713a8ce1b8890f7a0c15ab338bb Mon Sep 17 00:00:00 2001
From: Vince Weaver <vince@deater.net>
Date: Fri, 15 Apr 2022 08:18:47 -0400
Subject: [PATCH] lemm: switch to other iic vblank method

---
 games/lemm/intro_level.s | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/games/lemm/intro_level.s b/games/lemm/intro_level.s
index 9dea1c2a..88d51190 100644
--- a/games/lemm/intro_level.s
+++ b/games/lemm/intro_level.s
@@ -364,7 +364,7 @@ level_end_messages_h:
 
 .align $100
 
-.if 1
+.if 0
 	;==============
 	; this code from https://comp.sys.apple2.narkive.com/dHkvl39d/vblank-apple-iic
 	; as well as IIc technote #9
@@ -389,7 +389,7 @@ rdvbl2:
 	; alternate implementation by Oliver Schmidt
 	; from https://github.com/cc65/cc65/blob/master/libsrc/apple2/waitvsync.s
 split_screen_iic:
-	sei			; disables interrupts
+;	sei			; disables interrupts
 	sta	IOUDISOFF
 	lda	RDVBLMSK
 	bit	ENVBL
@@ -400,9 +400,10 @@ split_screen_iic:
 	bcs	:+		; VBL interrupts were already enabled
 	bit	DISVBL
 :	sta	IOUDISON	; IIc Tech Ref Man: The firmware normally leaves IOUDIS on.
-	cli			; re-enable interrupts
+;	cli			; re-enable interrupts
 
 	jmp	start_vblank
+
 .endif