diff --git a/A2Mac/Apple2_mmio.h b/A2Mac/Apple2_mmio.h
index f3dde28..16163a7 100644
--- a/A2Mac/Apple2_mmio.h
+++ b/A2Mac/Apple2_mmio.h
@@ -166,8 +166,11 @@ typedef union address16_u {
         return 0;
 
 
+static const int minDiskTrackNum = 0;
+static const int maxDiskTrackNum = 39;
+static const int minDiskPhaseStates = 8; // 4 quarters * 2 because of two neighbouring magnets can be activated at the same time which gets you a half quarter movement
 static const int minDiskPhaseNum = 0;
-static const int maxDiskPhaseNum = 79;
+static const int maxDiskPhaseNum = minDiskPhaseStates * maxDiskTrackNum;
 
 struct phase_t {
     uint8_t lastMagnet  : 4;
diff --git a/A2Mac/instructions/6502_instr_load_store.h b/A2Mac/instructions/6502_instr_load_store.h
index 3c92d96..0ec45ca 100644
--- a/A2Mac/instructions/6502_instr_load_store.h
+++ b/A2Mac/instructions/6502_instr_load_store.h
@@ -104,7 +104,7 @@ INLINE void STR( uint8_t * dst, uint8_t src ) {
 //    }
 //    else
     if ( ( addr >= 0xC000 ) && ( addr < 0xD000 ) ) {
-//        printf("mmio write:[%04X] = %02X\n", addr, src);
+    //    printf("mmio write:[%04X] = %02X\n", addr, src);
     }
     // Need to protect ROM!!!
     else if ( ( addr >= 0xE000 ) && ( addr < 0xF000 ) ) {