From e241085fb527e38bf4e9f992067ccb5cebc6fea9 Mon Sep 17 00:00:00 2001
From: Michael Pavone <pavone@retrodev.com>
Date: Sat, 5 Dec 2015 18:40:34 -0800
Subject: Mouse X and Y are 9-bit 2's complement not 8-bit magnitude + sign bit
 like I thought. Fixed mouse Y direction.

---
 menu.s68 | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'menu.s68')

diff --git a/menu.s68 b/menu.s68
index c9f8e59..1a30874 100644
--- a/menu.s68
+++ b/menu.s68
@@ -364,6 +364,7 @@ handle_mouse:
 	move.b #1, mouse_shown.w
 
 .skip_show_check
+	neg.w d1
 	move.l mouse_sprite.w, a2
 	add.w d1, (a2)
 	add.w d0, mouse_x.w
@@ -505,11 +506,11 @@ loop:
 
 	btst #4, d3
 	beq xpos
-	neg.w d0
+	or.w #$FF00, d0
 xpos
 	btst #5, d3
 	beq ypos
-	neg.w d1
+	or.w #$FF00, d1
 ypos
 	;set port config back to normal controller mode
 	move.b #$40, (PAD1_CTRL-PAD1_DATA, a2)
-- 
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