From f6961e440ed23676d0ff455cfa332e6334362dd1 Mon Sep 17 00:00:00 2001
From: Jan Phillips <janpatekphillips@gmail.com>
Date: Thu, 4 Jan 2024 20:42:32 +0000
Subject: [PATCH] complete

---
 big_checkerboard.asm | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/big_checkerboard.asm b/big_checkerboard.asm
index f8ca27d..61029b8 100644
--- a/big_checkerboard.asm
+++ b/big_checkerboard.asm
@@ -6,9 +6,19 @@
 
 //1 row of squares = 32 * 64 words = 
 
+(start)
+
 @word
 M=-1
 
+@67
+D=A
+@KBD
+D=D-M
+@flip_word
+D;JEQ
+
+(setup)
 @SCREEN
 D=A
 
@@ -97,7 +107,14 @@ MD=M-1
 @row
 D;JGT
 
-(end)
-@end
+@start
 0;JMP
 
+(flip_word)
+@word
+M=!M
+@setup
+0;JMP
+
+
+