Some minor UI improvements to ensure the user always knows what is going on. There should be no more blank screens for any significant period of time.

a2sudoku/ui.c

@@ -176,6 +176,7 @@ void shutdownUI(void)
 
 void textMode(void)
 {
+    clrscr();
     asm ("STA %w", 0xc051);
 }
 
@@ -252,8 +253,6 @@ bool setOptions(void)
         saveOptions();
     }
     
-    clrscr();
-    
     return shouldUpdate;
 }
 
@@ -523,9 +522,10 @@ bool playGame(void)
     
     initUI();
     
-    clrscr();
     textMode();
     
+    printf("\n\nChecking for a saved puzzle...");
+    
     if (loadGame(updatePos)) {
         bool gotAnswer = false;
         
@@ -571,7 +571,6 @@ bool playGame(void)
     
     while (true) {
         bool shouldNotBeep = true;
-        bool shouldRefresh = false;
         
         if (isPuzzleSolved()) {
             youWon();
@@ -591,7 +590,8 @@ bool playGame(void)
             case 'o':
             case 'O':
                 textMode();
-                shouldRefresh = setOptions();
+                if (setOptions())
+                    refreshAllPos();
                 graphicsMode();
                 break;
                 
@@ -762,8 +762,6 @@ bool playGame(void)
         if (!shouldNotBeep) {
             printf("\007");
         }
-        if (shouldRefresh)
-            refreshAllPos();
     }
     
     return false;