Tentatively remove the legacy kludge in RIOT timer handling.

src/emucore/M6532.cxx

@@ -173,11 +173,7 @@ uInt8 M6532::peek(uInt16 addr)
       // Get number of clocks since timer was set
       Int32 timer = timerClocks();
 
-      // Note that this constant comes from z26, and corresponds to
-      // 256 intervals of T1024T (ie, the maximum that the timer should hold)
-      // I'm not sure why this is required, but quite a few ROMs fail
-      // if we just check >= 0.
-      if(!(timer & 0x40000))
+      if(timer >= 0)
       {
         // Return at 'divide by TIMxT' interval rate
         return (timer >> myIntervalShift) & 0xff;