Real-time dropout only makes sense on the Teensy; don't force it on SDL

Makefile

@@ -3,7 +3,7 @@ LDFLAGS=-L/usr/local/lib
 SDLLIBS=-lSDL2 -lpthread
 FBLIBS=-lpthread
 
-CXXFLAGS=-Wall -I/usr/include/SDL2 -I .. -I . -I apple -I nix -I sdl -I/usr/local/include/SDL2 -g -O3
+CXXFLAGS=-Wall -I/usr/include/SDL2 -I .. -I . -I apple -I nix -I sdl -I/usr/local/include/SDL2 -g -O3 -DSUPPRESSREALTIME
 
 TSRC=cpu.cpp util/testharness.cpp
 

apple/applemmu.cpp

@@ -562,9 +562,11 @@ uint8_t AppleMMU::readSwitches(uint16_t address)
 
   case 0xC030: // SPEAKER
     g_speaker->toggle(g_cpu->cycles);
+#ifndef SUPPRESSREALTIME
     g_cpu->realtime(); // cause the CPU to stop processing its outer
 		       // loop b/c the speaker might need attention
 		       // immediately
+#endif
     return FLOATING;
 
   case 0xC050: // CLRTEXT
@@ -721,9 +723,11 @@ void AppleMMU::writeSwitches(uint16_t address, uint8_t v)
     // Writes toggle the speaker twice
     g_speaker->toggle(g_cpu->cycles);
     g_speaker->toggle(g_cpu->cycles);
+#ifndef SUPPRESSREALTIME
     g_cpu->realtime(); // cause the CPU to stop processing its outer
 		       // loop b/c the speaker might need attention
 		       // immediately
+#endif
     return;
 
   case 0xC050: // graphics mode

apple/diskii.cpp

@@ -139,10 +139,6 @@ void DiskII::Reset()
 
 uint8_t DiskII::readSwitches(uint8_t s)
 {
-#if 0
-  g_cpu->realtime(); /* cause the CPU to stop processing its outer            
-		      * loop b/c the disk might need attention immediately */
-#endif
   switch (s) {
   case 0x00: // change stepper motor phase
     break;