From 36be00122997abd26d6ac18a47e03b5c3609532e Mon Sep 17 00:00:00 2001
From: Jeremy Rand <jeremy@rand-family.com>
Date: Mon, 27 Jul 2020 21:47:28 -0400
Subject: [PATCH] Improve the randN function.  Show a different colour on the
 border when drawing versus updating the game state.

---
 BuGS/game.s   | 6 ++++++
 BuGS/random.s | 8 ++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/BuGS/game.s b/BuGS/game.s
index 152b988..294c3c2 100644
--- a/BuGS/game.s
+++ b/BuGS/game.s
@@ -36,6 +36,12 @@ gameLoop anop
         jsl drawFlea
         jsl drawDirtyNonGameTiles
         
+        short i,m
+        lda >BORDER_COLOUR_REGISTER
+        and #$f1
+        sta >BORDER_COLOUR_REGISTER
+        long i,m
+        
         jsl updateScorpion
         jsl updateSpider
         jsl updateFlea
diff --git a/BuGS/random.s b/BuGS/random.s
index 144d063..c8cb5b6 100644
--- a/BuGS/random.s
+++ b/BuGS/random.s
@@ -88,10 +88,14 @@ randN_ret0 anop
         
 randN_doit anop
         sta upperLimit
-randN_retry anop
         jsl rand0_to_14
+randN_loop anop
         cmp upperLimit
-        bge randN_retry
+        blt randN_done
+        sec
+        sbc upperLimit
+        bra randN_loop
+randN_done anop
         rtl